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• Issues with timed out downloads via TomCat?

  - by Ira Baxter

  We get, in our opinion, a lot of failed download attempts and want to understand why. We offer downloads via an email link (typical): http://www.semanticdesigns.com/deliverEval/<productname> This is processed by Tomcat on Linux via a jsp file, with the following code: response.addHeader( "Content-Disposition", "attachment; filename=" + fileTail ); response.addHeader( "Content-Type", "application/x-msdos-program" ); byte[] buf = new byte[8192]; int read; try { java.io.FileInputStream input = new java.io.FileInputStream( filename ); java.io.OutputStream o = response.getOutputStream(); while( ( read = input.read( buf, 0, 8192 ) ) != -1 ){ o.write( buf, 0, read ); } o.flush(); } catch( Exception e ){ util.fatalError( request.getRequestURI(), "Error sending file '" + filename + "' to client", e ); throw e; } We get a lot of reported errors (about 50% error rate): URI --- /deliverEval/download.jsp Code Message: Error sending file '/home/sd/ShippingMasters/DMS/Domains/C/GCC3/Tools/TestCoverage/SD_C~GCC3_TestCoverage.1.6.12.exe' to client Stack Trace ----------- null at org.apache.coyote.tomcat5.OutputBuffer.realWriteBytes(byte[], int, int) (Unknown Source) at org.apache.tomcat.util.buf.ByteChunk.append(byte[], int, int) (Unknown Source) at org.apache.coyote.tomcat5.OutputBuffer.writeBytes(byte[], int, int) (Unknown Source) at org.apache.coyote.tomcat5.OutputBuffer.write(byte[], int, int) (Unknown Source) at org.apache.coyote.tomcat5.CoyoteOutputStream.write(byte[], int, int) (Unknown Source) at org.apache.jsp.deliverEval.download_jsp._jspService(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) (Unknown Source) at org.apache.jasper.runtime.HttpJspBase.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) (Unknown Source) at javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse) (Unknown Source) at org.apache.jasper.servlet.JspServletWrapper.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, boolean) (Unknown Source) at org.apache.jasper.servlet.JspServlet.serviceJspFile(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.String, java.lang.Throwable, boolean) (Unknown Source) at org.apache.jasper.servlet.JspServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) (Unknown Source) at javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse) (Unknown Source) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse) (Unknown Source) at org.apache.catalina.core.ApplicationFilterChain.doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse) (Unknown Source) at org.apache.catalina.core.StandardWrapperValve.invoke(org.apache.catalina.Request, org.apache.catalina.Response, org.apache.catalina.ValveContext) (Unknown Source) We don't understand why this rate should be so high. Is there any way to get more information about the cause of the error? It is useful to know that these are pretty big documents, 3-50 megabytes. They reside on the Linux server so reading them is just a local disk read, and is unlikely to be a contributor to the problem. But sheer size might be an issue for the recipients browser? Is this kind of error rate typical for downloads? My personal experience downloading other's documents suggests no; our internal attempts show this to be very reliable, but we're operating on our internal network for such experiments so we're missing the complexity of the intervening internet.

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• JavaScript local alias pattern

  Heres a little pattern that is fairly common from JavaScript developers but that is not very well known from C# developers or people doing only occasional JavaScript development. In C#, you can use a using directive to create aliases of namespaces or bring them to the global scope: namespace Fluent.IO { using System; using System.Collections; using SystemIO = System.IO; In JavaScript, the only scoping construct there is is the function, but it can also be used as a local aliasing...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• JavaScript local alias pattern

  Heres a little pattern that is fairly common from JavaScript developers but that is not very well known from C# developers or people doing only occasional JavaScript development. In C#, you can use a using directive to create aliases of namespaces or bring them to the global scope: namespace Fluent.IO { using System; using System.Collections; using SystemIO = System.IO; In JavaScript, the only scoping construct there is is the function, but it can also be used as a local aliasing...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Web Application : How to upload multiple images at a time

  - by SAMIR BHOGAYTA

  //First add image control into the web form how many you want to upload images at a time //Add one button //Write the below code into the button_click event if (FileUpload1.HasFile) { string imagefile = FileUpload1.FileName; if (CheckFileType(imagefile) == true) { Random rndob = new Random(); int db = rndob.Next(1, 100); filename = System.IO.Path.GetFileNameWithoutExtension(imagefile) + db.ToString() + System.IO.Path.GetExtension(imagefile); String FilePath = "images/" + filename; FileUpload1.SaveAs(Server.MapPath(FilePath)); objimg.ImageName = filename; Image1(); if (Session["imagecount"].ToString() == "1") { Img1.ImageUrl = FilePath; ViewState["img1"] = FilePath; } else if (Session["imagecount"].ToString() == "2") { Img1.ImageUrl = ViewState["img1"].ToString(); Img2.ImageUrl = FilePath; ViewState["img2"] = FilePath; } else if (Session["imagecount"].ToString() == "3") { Img1.ImageUrl = ViewState["img1"].ToString(); Img2.ImageUrl = ViewState["img2"].ToString(); Img3.ImageUrl = FilePath; ViewState["img3"] = FilePath; } else if (Session["imagecount"].ToString() == "4") { Img1.ImageUrl = ViewState["img1"].ToString(); Img2.ImageUrl = ViewState["img2"].ToString(); Img3.ImageUrl = ViewState["img3"].ToString(); Img4.ImageUrl = FilePath; ViewState["img4"] = FilePath; } else if (Session["imagecount"].ToString() == "5") { Img1.ImageUrl = ViewState["img1"].ToString(); Img2.ImageUrl = ViewState["img2"].ToString(); Img3.ImageUrl = ViewState["img3"].ToString(); Img4.ImageUrl = ViewState["img4"].ToString(); Img5.ImageUrl = FilePath; ViewState["img5"] = FilePath; } } } //execption handling else { lblErrMsg.Visible = true; lblErrMsg.Text = ""; lblErrMsg.Text = "please select a file"; } } //if file extension belongs to these list then only allowed public bool CheckFileType(string filename) { string ext; ext = System.IO.Path.GetExtension(filename); switch (ext.ToLower()) { case ".gif": return true; case ".jpeg": return true; case ".jpg": return true; case ".bmp": return true; case ".png": return true; default: return false; } }

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• Server Controls in ASP.NET MVC without ViewState

  - by imran_ku07

    Introduction :           ASP.NET Web Forms provides a development environment just like GUI or windows application and try to hide statelessness nature of HTTP protocol. For accomplishing this target, Web Forms uses ViewState (a hidden field) to remove the gap between HTTP statelessness and GUI applications. But the problem with this technique is that ViewState size which grows quickly and also go back and forth with every request, as a result it will degrade application performance. In this article i will try to use existing ASP.NET server controls without ViewState.   Description :           When you add a server control which needs viewstate, in the presentation view in ASP.NET MVC application without a form tag, for example,            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>            It will shows the following exception,            Control 'TextBox1' of type 'TextBox' must be placed inside a form tag with runat=server             When you place this textbox inside a form tag with runat=server, this will add the following ViewState even when you disable ViewState by using EnableViewState="false"            <input type="hidden" value="/wEPDwUJMjgzMDgzOTgzZGQ6u9CwikhHEW39ObrHyLTPFSboPA==" id="__VIEWSTATE" name="__VIEWSTATE"/>             The solution to this problem is to use the RenderControl method of server control which is simply renders HTML without any ViewState hidden field.         <% TextBox txt = new TextBox();          txt.Text = "abc";          StringBuilder sb = new StringBuilder();          System.IO.StringWriter textwriter = new System.IO.StringWriter(sb);          HtmlTextWriter htmlwriter = new HtmlTextWriter(textwriter);          txt.RenderControl(htmlwriter);  %>        <%= sb.ToString() %>             This will render <input type="text" > without any View State. This technique become very useful when you are using rich server controls like GridView. For example, let's say you have List of Recalls in Model.Recalls, then you will show your tabular data as,     <%  GridView gv = new GridView();          gv.AutoGenerateColumns = true;          gv.DataSource = Model.Recalls;          gv.DataBind();         StringBuilder sb = new StringBuilder();         System.IO.StringWriter textwriter = new System.IO.StringWriter(sb);         HtmlTextWriter htmlwriter = new HtmlTextWriter(textwriter);         gv.RenderControl(htmlwriter);%>            <%= sb.ToString() %>             This code might looks odd in your presentation view. A more better approach is to create a HTML Helper method which contains the above code. Summary :        In some cases you might needs to use existing ASP.NET Web Forms server controls but also dislikes ViewState. In this article i try to solve this gap by using the RenderControl method of Control class. Hopefully you enjoyed and become ready to create HTML helpers for many of the existing server controls.

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• Understanding C# async / await (2) Awaitable / Awaiter Pattern

  - by Dixin

  What is awaitable Part 1 shows that any Task is awaitable. Actually there are other awaitable types. Here is an example: Task<int> task = new Task<int>(() => 0); int result = await task.ConfigureAwait(false); // Returns a ConfiguredTaskAwaitable<TResult>. The returned ConfiguredTaskAwaitable<TResult> struct is awaitable. And it is not Task at all: public struct ConfiguredTaskAwaitable<TResult> { private readonly ConfiguredTaskAwaiter m_configuredTaskAwaiter; internal ConfiguredTaskAwaitable(Task<TResult> task, bool continueOnCapturedContext) { this.m_configuredTaskAwaiter = new ConfiguredTaskAwaiter(task, continueOnCapturedContext); } public ConfiguredTaskAwaiter GetAwaiter() { return this.m_configuredTaskAwaiter; } } It has one GetAwaiter() method. Actually in part 1 we have seen that Task has GetAwaiter() method too: public class Task { public TaskAwaiter GetAwaiter() { return new TaskAwaiter(this); } } public class Task<TResult> : Task { public new TaskAwaiter<TResult> GetAwaiter() { return new TaskAwaiter<TResult>(this); } } Task.Yield() is a another example: await Task.Yield(); // Returns a YieldAwaitable. The returned YieldAwaitable is not Task either: public struct YieldAwaitable { public YieldAwaiter GetAwaiter() { return default(YieldAwaiter); } } Again, it just has one GetAwaiter() method. In this article, we will look at what is awaitable. The awaitable / awaiter pattern By observing different awaitable / awaiter types, we can tell that an object is awaitable if It has a GetAwaiter() method (instance method or extension method); Its GetAwaiter() method returns an awaiter. An object is an awaiter if: It implements INotifyCompletion or ICriticalNotifyCompletion interface; It has an IsCompleted, which has a getter and returns a Boolean; it has a GetResult() method, which returns void, or a result. This awaitable / awaiter pattern is very similar to the iteratable / iterator pattern. Here is the interface definitions of iteratable / iterator: public interface IEnumerable { IEnumerator GetEnumerator(); } public interface IEnumerator { object Current { get; } bool MoveNext(); void Reset(); } public interface IEnumerable<out T> : IEnumerable { IEnumerator<T> GetEnumerator(); } public interface IEnumerator<out T> : IDisposable, IEnumerator { T Current { get; } } In case you are not familiar with the out keyword, please find out the explanation in Understanding C# Covariance And Contravariance (2) Interfaces. The “missing” IAwaitable / IAwaiter interfaces Similar to IEnumerable and IEnumerator interfaces, awaitable / awaiter can be visualized by IAwaitable / IAwaiter interfaces too. This is the non-generic version: public interface IAwaitable { IAwaiter GetAwaiter(); } public interface IAwaiter : INotifyCompletion // or ICriticalNotifyCompletion { // INotifyCompletion has one method: void OnCompleted(Action continuation); // ICriticalNotifyCompletion implements INotifyCompletion, // also has this method: void UnsafeOnCompleted(Action continuation); bool IsCompleted { get; } void GetResult(); } Please notice GetResult() returns void here. Task.GetAwaiter() / TaskAwaiter.GetResult() is of such case. And this is the generic version: public interface IAwaitable<out TResult> { IAwaiter<TResult> GetAwaiter(); } public interface IAwaiter<out TResult> : INotifyCompletion // or ICriticalNotifyCompletion { bool IsCompleted { get; } TResult GetResult(); } Here the only difference is, GetResult() return a result. Task<TResult>.GetAwaiter() / TaskAwaiter<TResult>.GetResult() is of this case. Please notice .NET does not define these IAwaitable / IAwaiter interfaces at all. As an UI designer, I guess the reason is, IAwaitable interface will constraint GetAwaiter() to be instance method. Actually C# supports both GetAwaiter() instance method and GetAwaiter() extension method. Here I use these interfaces only for better visualizing what is awaitable / awaiter. Now, if looking at above ConfiguredTaskAwaitable / ConfiguredTaskAwaiter, YieldAwaitable / YieldAwaiter, Task / TaskAwaiter pairs again, they all “implicitly” implement these “missing” IAwaitable / IAwaiter interfaces. In the next part, we will see how to implement awaitable / awaiter. Await any function / action In C# await cannot be used with lambda. This code: int result = await (() => 0); will cause a compiler error: Cannot await 'lambda expression' This is easy to understand because this lambda expression (() => 0) may be a function or a expression tree. Obviously we mean function here, and we can tell compiler in this way: int result = await new Func<int>(() => 0); It causes an different error: Cannot await 'System.Func<int>' OK, now the compiler is complaining the type instead of syntax. With the understanding of the awaitable / awaiter pattern, Func<TResult> type can be easily made into awaitable. GetAwaiter() instance method, using IAwaitable / IAwaiter interfaces First, similar to above ConfiguredTaskAwaitable<TResult>, a FuncAwaitable<TResult> can be implemented to wrap Func<TResult>: internal struct FuncAwaitable<TResult> : IAwaitable<TResult> { private readonly Func<TResult> function; public FuncAwaitable(Func<TResult> function) { this.function = function; } public IAwaiter<TResult> GetAwaiter() { return new FuncAwaiter<TResult>(this.function); } } FuncAwaitable<TResult> wrapper is used to implement IAwaitable<TResult>, so it has one instance method, GetAwaiter(), which returns a IAwaiter<TResult>, which wraps that Func<TResult> too. FuncAwaiter<TResult> is used to implement IAwaiter<TResult>: public struct FuncAwaiter<TResult> : IAwaiter<TResult> { private readonly Task<TResult> task; public FuncAwaiter(Func<TResult> function) { this.task = new Task<TResult>(function); this.task.Start(); } bool IAwaiter<TResult>.IsCompleted { get { return this.task.IsCompleted; } } TResult IAwaiter<TResult>.GetResult() { return this.task.Result; } void INotifyCompletion.OnCompleted(Action continuation) { new Task(continuation).Start(); } } Now a function can be awaited in this way: int result = await new FuncAwaitable<int>(() => 0); GetAwaiter() extension method As IAwaitable shows, all that an awaitable needs is just a GetAwaiter() method. In above code, FuncAwaitable<TResult> is created as a wrapper of Func<TResult> and implements IAwaitable<TResult>, so that there is a  GetAwaiter() instance method. If a GetAwaiter() extension method  can be defined for Func<TResult>, then FuncAwaitable<TResult> is no longer needed: public static class FuncExtensions { public static IAwaiter<TResult> GetAwaiter<TResult>(this Func<TResult> function) { return new FuncAwaiter<TResult>(function); } } So a Func<TResult> function can be directly awaited: int result = await new Func<int>(() => 0); Using the existing awaitable / awaiter - Task / TaskAwaiter Remember the most frequently used awaitable / awaiter - Task / TaskAwaiter. With Task / TaskAwaiter, FuncAwaitable / FuncAwaiter are no longer needed: public static class FuncExtensions { public static TaskAwaiter<TResult> GetAwaiter<TResult>(this Func<TResult> function) { Task<TResult> task = new Task<TResult>(function); task.Start(); return task.GetAwaiter(); // Returns a TaskAwaiter<TResult>. } } Similarly, with this extension method: public static class ActionExtensions { public static TaskAwaiter GetAwaiter(this Action action) { Task task = new Task(action); task.Start(); return task.GetAwaiter(); // Returns a TaskAwaiter. } } an action can be awaited as well: await new Action(() => { }); Now any function / action can be awaited: await new Action(() => HelperMethods.IO()); // or: await new Action(HelperMethods.IO); If function / action has parameter(s), closure can be used: int arg0 = 0; int arg1 = 1; int result = await new Action(() => HelperMethods.IO(arg0, arg1)); Using Task.Run() The above code is used to demonstrate how awaitable / awaiter can be implemented. Because it is a common scenario to await a function / action, so .NET provides a built-in API: Task.Run(): public class Task2 { public static Task Run(Action action) { // The implementation is similar to: Task task = new Task(action); task.Start(); return task; } public static Task<TResult> Run<TResult>(Func<TResult> function) { // The implementation is similar to: Task<TResult> task = new Task<TResult>(function); task.Start(); return task; } } In reality, this is how we await a function: int result = await Task.Run(() => HelperMethods.IO(arg0, arg1)); and await a action: await Task.Run(() => HelperMethods.IO());

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• JAVA: POST data via HTTPS does not seem to get sent?

  - by ostollmann

  Hi guys (and girls), I have a problem POSTing data via HTTPS in Java. The server response is the same whether or not I send 'query'. Maybe someone can point out what the problem is... Thanks! Main class: package bind; public class Main { public static final String urlString = "https://www.sms.ethz.ch/cgi-bin/sms/send.pl"; public static void main(String[] args) { Message msg = new Message("Alles klar?"); URL url = new URL(urlString); String[][] values = new String[3][2]; values[0][0] = "action"; values[0][1] = "listoriginators"; values[1][0] = "username"; values[1][1] = "xxxxxx"; values[2][0] = "password"; values[2][1] = "xxxxxx"; Query query = new Query(values); System.out.println("Query: " + query.getQuery()); Request request = new Request(url.getURL(), query.getQuery()); } } Request class: package bind; public class Request { static private int ic = 0; private URL url; protected Request(java.net.URL URL, String query){ ic++; if(CONSTANTS.SHOW_LOGS) { System.out.println("log: new instance of 'Message'"); } // connect try { System.setProperty("java.protocol.handler.pkgs", "com.sun.net.ssl.internal.www.protocol"); java.security.Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider()); javax.net.ssl.HttpsURLConnection connection = (javax.net.ssl.HttpsURLConnection) URL.openConnection(); connection.setDoInput(true); connection.setDoOutput(true); connection.setRequestMethod("POST"); connection.setFollowRedirects(true); connection.setRequestProperty("Content-Length", String.valueOf(query.length())); connection.setRequestProperty("Content-Type", "application/x-www- form-urlencoded"); connection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)"); java.io.DataOutputStream output = new java.io.DataOutputStream(connection.getOutputStream()); output.writeBytes(query); // <<-- NOTHING CHANGES IF I COMMENT THIS OUT OR NOT !!??!?! System.out.println("log: response code: " + connection.getResponseCode()); System.out.println("log: response message: " + connection.getResponseMessage()); java.io.DataInputStream input = new java.io.DataInputStream(connection.getInputStream()); for(int i = input.read(); i != -1; i = input.read()) { System.out.print((char)i); } System.out.print("\n"); input.close(); } catch(java.io.IOException e) { if(CONSTANTS.SHOW_LOGS) { System.out.println("error: unable to connect"); System.out.println(e); e.printStackTrace(); } } } } URL Class: public class URL { static private int ic = 0; private String URLString; private java.net.URL url; protected URL(String a_url){ ic++; if(CONSTANTS.SHOW_LOGS) { System.out.println("log: new instance of 'URL'"); } setURLString(a_url); createURL(); } private void setURLString(String a_url) { URLString = a_url; } private void createURL() { try { url = new java.net.URL(URLString); } catch(java.net.MalformedURLException e) { System.out.println("error: invalid URL"); System.out.println(e); e.printStackTrace(); } } private void showURL() { System.out.println("URL: " + url.getHost() + url.getPath()); } public java.net.URL getURL() { return url; } } PS: mostly from here: http://www.java-samples.com/java/POST-toHTTPS-url-free-java-sample-program.htm

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• The First Annual Crappy Code Games

  - by Testas

  SQLBits announced some super-exciting news! A tie-up with our platinum sponsor, Fusion-io. Together we'll be running a series of events called "The Crappy Code Games" where SQL Server developers will compete to write the worst-performing code and win some very cool prizes including:   •        Gold: A hands-on, high performance flying day for two at Ultimate High plus Fusion-io flight jackets•        Silver: One day racing experience at Palmer Sports where you will drive seven different high performance cars•        Bronze: Pure Tech Racing 10 person package at PTR’s F1 racing facility includes FI tees, food and drinks. …plus iPods, Windows Mobile phones, X-box 360s, t-shirts and much more. There will be two qualifying events in Manchester on March 17th and London on March 31st, and the third qualifier as well as the grand finale will be held in the evening of Thursday April 7th at SQLBits. And if that isn’t cool enough, Fusion-io's Chief Scientist Steve Wozniak (yes, that Steve Wozniak, tech industry legend and co-founder of Apple) will be on hand in Brighton to hand out the prizes! If you'd like to take part you'll need to register, and since places are limited we recommend you do so right away. For more details and to register, go to http://www.crappycodegames.com/ The Games: In conjunction with SQL Bits, dbA-thletes (that’s you) will compete  head-to-head in one of three separate qualifying events to be held in Manchester, London and Brighton.  Four separate SQL  rounds make up the evening’s Games, and will challenge you to write code that pushes the boundaries of SQL performance.  The four events are: ?  The High Jump: Generate the highest I/O per second ?  The 100 m dash: Cumulative highest number of I/O’s in 60 seconds ?  The SSIS-athon: Load one billion row fact table in the shortest time ?  The Marathon: Generate the highest MB per second in 60 seconds

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• Best practices for logging user actions in production

  - by anthonypliu

  I was planning on logging a lot of different stuff in my production environment, things like when a user: Logs In, Logs Off Change Profile Edit Account settings Change password ... etc Is this a good practice to do on a production enviornment? Also what is a good way to log all this. I am currently using the following code block to log to: public void LogMessageToFile(string msg) { System.IO.StreamWriter sw = System.IO.File.AppendText( GetTempPath() + @"MyLogFile.txt"); try { string logLine = System.String.Format( "{0:G}: {1}.", System.DateTime.Now, msg); sw.WriteLine(logLine); } finally { sw.Close(); } } Will this be ok for production? My application is very new so im not expecting millions of users right away or anything, looking for the best practices to keeping track of actions on a website or if its even best practice to.

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• ASP.NET Hosting :: ASP.NET File Upload Control

  - by mbridge

  The asp.net FileUpload control allows a user to browse and upload files to the web server. From developers perspective, it is as simple as dragging and dropping the FileUpload control to the aspx page. An extra control, like a Button control, or some other control is needed, to actually save the file. <asp:FileUploadID="FileUpload1"runat="server"/> <asp:ButtonID="B1"runat="server"Text="Save"OnClick="B1_Click"/> By default, the FileUpload control allows a maximum of 4MB file to be uploaded and the execution timeout is 110 seconds. These properties can be changed from within the web.config file’s httpRuntime section. The maxRequestLength property determines the maximum file size that can be uploaded. The executionTimeout property determines the maximum time for execution. <httpRuntimemaxRequestLength="8192"executionTimeout="220"/> From code behind, the mime type, size of the file, file name and the extension of the file can be obtained. The maximum file size that can be uploaded can be obtained and modified using the System.Web.Configuration.HttpRuntimeSection class. Files can be alternatively saved using the System.IO.HttpFileCollection class. This collection class can be populated using the Request.Files property. The collection contains HttpPostedFile class which contains a reference to the class. using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.IO; using System.Configuration; using System.Web.Configuration;   namespace WebApplication1 {     public partial class WebControls : System.Web.UI.Page     {         protected void Page_Load(object sender, EventArgs e)         {         }           //Using FileUpload control to upload and save files         protected void B1_Click(object sender, EventArgs e)         {             if (FileUpload1.HasFile && FileUpload1.PostedFile.ContentLength > 0)             {                 //mime type of the uploaded file                 string mimeType = FileUpload1.PostedFile.ContentType;                   //size of the uploaded file                 int size = FileUpload1.PostedFile.ContentLength; // bytes                   //extension of the uploaded file                 string extension = System.IO.Path.GetExtension(FileUpload1.FileName);                                  //save file                 string path = Server.MapPath("path");                                 FileUpload1.SaveAs(path + FileUpload1.FileName);                              }             //maximum file size allowed             HttpRuntimeSection rt = new HttpRuntimeSection();             rt.MaxRequestLength = rt.MaxRequestLength * 2;             int length = rt.MaxRequestLength;                     //execution timeout             TimeSpan ts = rt.ExecutionTimeout;             double secomds = ts.TotalSeconds;           }           //Using Request.Files to save files         private void AltSaveFile()         {             HttpFileCollection coll = Request.Files;             for (int i = 0; i < coll.Count; i++)             {                 HttpPostedFile file = coll[i];                   if (file.ContentLength > 0)                     ;//do something             }         }     } }

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• Ubuntu btrfs: how to remove rootflags=subvol=@ from grub.cfg

  - by mnpria

  When i mount "btrfs" as a root filesytem, the mount info is as below: root@ubuntu1304Btrfs:~# mount /dev/mapper/ubuntu1304Btrfs--vg-root on / type btrfs (rw,subvol=@) Is there a way to have a mount info without the "subvol" information ? I have tried executing what was mentioned here. I also updated the grub.cfg. Still rootflags=subvol=@ is not removed. Is there a way to remove this subvol information ? root@ubuntu1304Btrfs:/home# mount /dev/mapper/ubuntu1304Btrfs--vg-root on / type btrfs (rw,subvol=@) /dev/mapper/ubuntu1304Btrfs--vg-root on /home type btrfs (rw,subvol=@home) root@ubuntu1304Btrfs:/# stat / File: ‘/’ Size: 262 Blocks: 0 IO Block: 4096 directory Device: 12h/18d Inode: 256 Links: 1 Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2013-11-11 19:56:04.548121873 +0530 Modify: 2013-11-11 19:55:18.008120103 +0530 Change: 2013-11-11 19:55:18.008120103 +0530 Birth: - root@ubuntu1304Btrfs:/# stat /home/ File: ‘/home/’ Size: 230 Blocks: 0 IO Block: 4096 directory Device: 19h/25d Inode: 256 Links: 1 Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2013-11-12 12:24:52.346377976 +0530 Modify: 2013-11-12 12:24:50.338377900 +0530 Change: 2013-11-12 12:24:50.338377900 +0530 Birth: -

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• How easily recognized are new TLDs?

  - by Ryan Muller

  I'm interested in purchasing a domain name for a new service I intend to market. I know that .com is instantly recognizable as a domain ending, and if I see stackoverflow.com I know it's a web address. However, I also recognize strings like github.io and mysite.tk as domains, since I've worked with domains like these. To the average member of the public, if one sees an address ending in .io or similar, non-mainstream TLD (e.g. on a billboard or business card) would they immediately know it's a URL and to type it into a browser? Or are these new domains only useful 1) for a technical audience or 2) when you will be primarily promoting your site through links and not print?

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• Should I ditch AJAX in client side web development when I've got a web-socket open?

  - by jt0dd

  I was thinking that maybe I should forget AJAX (HTTP) requests when I've got a web-socket open between client and server, but I decided I should ask here to check if this could be a bad practice for some reason that I'm not thinking of. Once the socket is open, there's less syntax (often meaning simpler error handling) involved in passing information between client and server with Socket.io (just one example of a web-socket). Is there some obvious situation where a web-socket (Socket.io for example) isn't going to be capable of handling a functionality that an AJAX request could do easily?

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• How the JOptionPane works

  - by DevAno1

  How can I control what happens with window after clicking JOPtionPane buttons ? I'm trying to implement simple file chooser. In my frame I have 3 buttons (OK, Cancel, Browse). Browse button opens file search window, and after picking files should return to main frame. Clicking OK will open a frame with the content of the file. Now porblem looks this way. With the code below, I can choose file but directly after that a new frame is created, and my frame with buttons dissapears : import java.io.File; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.awt.*; import javax.swing.*; import java.io.*; public class Main { public static void main(String args[]) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { show("Window"); } }); } public static void show(String frame_name){ JFrame frame = new JFrame(frame_name); frame.setPreferredSize(new Dimension(450, 300)); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel top = new JPanel(); top.setLayout(new BoxLayout(top, BoxLayout.Y_AXIS)); JFileChooser fc = new JFileChooser(new File(".")); JPanel creator = new JPanel(); creator.setLayout(new BoxLayout(creator, BoxLayout.Y_AXIS)); creator.add(top); String[] buttons = {"OK", "Cancel", "Browse"}; int rc = JOptionPane.showOptionDialog( null, creator, frame_name, JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, buttons, buttons[0] ); String approveButt = ""; switch(rc){ case 0: break; case 1: break; case 2: approveButt = buttons[rc]; int retVal = fc.showDialog(null, approveButt); if (retVal == JFileChooser.APPROVE_OPTION) System.out.println(approveButt + " " + fc.getSelectedFile()); break; } frame.pack(); frame.setVisible(true); } } With the second code I can return to my menu, but in no way I am able to pop this new frame, which appeared with first code. How to control this ? What am I missing ? public class Main { public static void main(String args[]) { javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { show("Window"); } }); } public static void show(String frame_name){ JFrame frame = new JFrame(frame_name); frame.setPreferredSize(new Dimension(450, 300)); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel top = new JPanel(); top.setLayout(new BoxLayout(top, BoxLayout.Y_AXIS)); JFileChooser fc = new JFileChooser(new File(".")); JPanel creator = new JPanel(); creator.setLayout(new BoxLayout(creator, BoxLayout.Y_AXIS)); creator.add(top); String[] buttons = {"OK", "Cancel", "Browse"}; String approveButt = ""; Plane m = null; int rc = -1; while (rc != 0) { rc = JOptionPane.showOptionDialog( null, creator, frame_name, JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, buttons, buttons[0] ); switch (rc) { case 0: m = new Plane(); case 1: System.exit(0); case 2: approveButt = buttons[rc]; int retVal = fc.showDialog(null, approveButt); if (retVal == JFileChooser.APPROVE_OPTION) System.out.println(approveButt + " " + fc.getSelectedFile()); break; default: break; } } addComponents(frame.getContentPane(), m); frame.pack(); frame.setVisible(true); } private static void addComponents(Container c, Plane e) { c.setLayout(new BoxLayout(c, BoxLayout.Y_AXIS)); c.add(e); } } class Plane extends JPanel { public Plane(){ } @Override public void paint(Graphics g){ g.setColor(Color.BLUE); g.fillRect(0, 0, 400, 250); } }

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• How do you use kate? Tips/Tricks/Workflow

  - by Roman A. Taycher

  We all seen a bunch of these? Mostly for IDE's but also for vim and emacs. Kate is (only) a text editor (an awesome one) but it has a ton of options plus a number of plugins, so its hard to know all of it well. How do use the Kate text editor? Please share your workflow and help me and others learn some of the cool tricks you use. I'll start I use the built in terminal a lot opening files quickly, and using it as an enhanced haskell repl with ghci (since ghci doesn't allow you all to just put in all kinds of haskell code). Also use split views to quickly compare files (especially different versions of the same file). Also the auto-complete maybe simple(more use for saving typing time then remembering functions) but it works really well for that. Also if You highlight something and hit a start [/{/( it puts it in between brackets rather then replacing it with a bracket(why the hell do a lot of IDEs not have this feature).

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• Error installing RVM

  - by Dbugger

  I am following this guide, but this is the output I receive. What am the problem? dbugger@mercury:~$ \curl -sSL https://get.rvm.io | bash -s stable --rails Downloading https://github.com/wayneeseguin/rvm/archive/stable.tar.gz Upgrading the RVM installation in /home/dbugger/.rvm/ RVM PATH line found in /home/dbugger/.profile /home/dbugger/.bashrc /home/dbugger/.zshrc. RVM sourcing line found in /home/dbugger/.bash_profile /home/dbugger/.zlogin. Upgrade of RVM in /home/dbugger/.rvm/ is complete. # Enrique, # # Thank you for using RVM! # We sincerely hope that RVM helps to make your life easier and more enjoyable!!! # # ~Wayne, Michal & team. In case of problems: http://rvm.io/help and https://twitter.com/rvm_io Upgrade Notes: * No new notes to display. rvm 1.25.27 (stable) by Wayne E. Seguin <[email protected]>, Michal Papis <[email protected]> [https://rvm.io/] Searching for binary rubies, this might take some time. No binary rubies available for: ubuntu/14.04/x86_64/ruby-2.1.2. Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies. Checking requirements for ubuntu. Installing requirements for ubuntu. Updating system.......... Installing required packages: gawk, libreadline6-dev, libssl-dev, libyaml-dev, libsqlite3-dev, sqlite3.... Error running 'requirements_debian_libs_install gawk libreadline6-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3', showing last 15 lines of /home/dbugger/.rvm/log/1401804140_ruby-2.1.2/package_install_gawk_libreadline6-dev_libssl-dev_libyaml-dev_libsqlite3-dev_sqlite3.log ++ /scripts/functions/utility : __rvm_try_sudo() 405 > sudo -p '%p password required for '\''apt-get --no-install-recommends --yes install gawk libreadline6-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3'\'': ' apt-get --no-install-recommends --yes install gawk libreadline6-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 Reading package lists... Building dependency tree... Reading state information... Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: libssl-dev : Depends: libssl1.0.0 (= 1.0.1f-1ubuntu2) but 1.0.1f-1ubuntu2.1 is to be installed E: Unable to correct problems, you have held broken packages. ++ /scripts/functions/utility : __rvm_try_sudo() 405 > return 100 ++ /scripts/functions/requirements/ubuntu : requirements_debian_libs_install() 36 > return 100 Requirements installation failed with status: 100.

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• Wrong statistics in AUX_STATS$ might puzzle the optimizer

  - by Mike Dietrich

  We do recommend the creation of System Statistics for quite a long time. Since Oracle 9i the optimizer works with a CPU and IO cost based model. And in order to give the optimizer some knowledge about the IO subsystem's performance and throughput - once System Statistics are collected - they'll get stored in AUX_STATS$. For this purpose in the old Oracle 9i days some default values had been defined - and you'll still find those defaults in Oracle Database 11g Release 2 in AUX_STATS$. But these old values don't reflect the performance of modern IO systems. So it might be a good best practice post upgrade to create fresh System Statistics if you haven't done this before.  You can collect System Statistics with: exec DBMS_STATS.GATHER_SYSTEM_STATS('start'); and end it later by executing: exec DBMS_STATS.GATHER_SYSTEM_STATS('stop'); You could also run DBMS_STATS.GATHER_SYSTEM_STATS('interval', interval=>N) instead where N is the number of minutes when statistics gathering is stopped automatically. Please make sure you'll do this on a real workload period. It won't make sense to gather these values while the database is in an idle state. You should do this ideally for several hours. It doesn't affect performance in a negative way as the values are anyway collected in V$SYSSTAT and V$SESSTAT. And in case you'd like to delete the stats and revert to the old default values you'd simply execute:exec DBMS_STATS.DELETE_SYSTEM_STATS; The tricky thing in Oracle Database 11.2 - and that's why I'm actually writing this blog post today - is bug9842771. This leads to wrong values in AUX_STATS$ for SREADTIM and MREADTIM by factor 1000 guiding the optimizer sometimes into the totally wrong directon. The workaround is to overwrite these values manually and divide them by 1000. Use the DBMS_STATS.SET_SYSTEM_STATS procedure. See this MOS Note:9842771.8 for the above bug for some further information. This issue is fixed in Oracle Database 11.2.0.3 and above. To get some background information about the statistics collected in please read this section in the Oracle Database 11.2 Performance Tuning Guide. And gathering System Statistics might have some implication if you have mixed workloads - and interacts with DB_FILE_MULTIBLOCK_READ_COUNT. For more information please read section 13.4.1.2.

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• Sending multiple requests simultaneously to the Server using Selenium with Java

  - by gagneet

  I wish to send multiple requests to the server, simultaneously. The problem statement will be: Read a text file containing multiple URL’s. Open each URL in the web browser. Collect the Cookie information for each call, and store it to a file. Send another call: http://myserver.com:1111/cookie?out=text Store the output (body text) of this file to a separate file for each call made in 4 Open the next URL in the text file given in 1 and repeat steps 1-6. The above is to be run with multi-threading, so that I can send around 5-10 URL requests simultaneously. I have implemented something in Selenium using Java, but have not been able to do the multi-threading approach. Code is given below: package com.cookie.selenium; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import com.thoughtworks.selenium.*; public class ReadURL extends SeleneseTestCase { public void setUp() throws Exception { setUp("http://www.myserver.com/", "*chrome"); } public static void main(String args[]) { Selenium selenium = new DefaultSelenium("localhost", 4444, "*chrome", "http://myserver"); selenium.start(); selenium.setTimeout("30000000"); try { BufferedReader inputfile = new BufferedReader(new FileReader("C:\\url.txt")); BufferedReader cookietextfile = new BufferedReader(new FileReader("C:\\text.txt")); BufferedWriter cookiefile = new BufferedWriter(new FileWriter("C:\\cookie.txt")); BufferedWriter outputfile = null; String str; String cookiestr = "http://myserver.com:1111/cookie?out=text"; String filename = null; int i = 0; while ((str = inputfile.readLine()) != null) { selenium.createCookie("T=222redHyt345&f=5&r=fg&t=100",""); selenium.open( str ); selenium.waitForPageToLoad("120000"); String urlcookie = selenium.getCookie(); System.out.println( "URL :" + str ); System.out.println( "Cookie :" + urlcookie ); cookiefile.write( urlcookie ); cookiefile.newLine(); selenium.open( cookiestr ); selenium.waitForPageToLoad("120000"); String bodytext = selenium.getBodyText(); System.out.println("Body Text :" + bodytext); filename = "C:\\cookies\\" + i + ".txt"; outputfile = new BufferedWriter(new FileWriter( filename )); outputfile.write( bodytext ); outputfile.newLine(); i++; } inputfile.close(); outputfile.close(); cookiefile.close(); selenium.stop(); } catch (IOException e) { } } } What basically I am trying to do here is, open the first set of URL from a text file (which has list given of all the URL's i wish to open). Then when I capture the cookie information from here and store it, I open another window to output all the cookie information for that server to my browser window. This works fine when I do outside of Selenium code, but when I do it within the above code, it opens a "Save As..." popup and my tests stop. :-( I wish to save the contents of that second call to a new file, but have not been able to do the same. Also, if I have to send multiple such requests to the server, how would that be possible in Java using a Selenium Framework. Currently, I am opening multiple instances of the framework and running them with different parameters :-(

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• The sieve of Eratosthenes in F#

  - by IVlad

  I am interested in an implementation of the sieve of eratosthenes in purely functional F#. I am interested in an implementation of the actual sieve, not the naive functional implementation that isn't really the sieve, so not something like this: let rec PseudoSieve list = match list with | hd::tl -> hd :: (PseudoSieve <| List.filter (fun x -> x % hd <> 0) tl) | [] -> [] The second link above briefly describes an algorithm that would require the use of a multimap, which isn't available in F# as far as I know. The Haskell implementation given uses a map that supports an insertWith method, which I haven't seen available in the F# functional map. Does anyone know a way to translate the given Haskell map code to F#, or perhaps knows of alternative implementation methods or sieving algorithms that are as efficient and better suited for a functional implementation or F#?

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• file copy error from system to cifs mount

  - by dwpriest

  When coping a file greater than 64kB from an Ubuntu server to a CIFS mounted windows share, most of the data is copied, but it seems the last chunk doesn't get copied. The size doesn't match, and the md5 check sums don't match. I have plenty of file space, but then I use cp, I get the following... cp: closing `cloudBackup/asdf.txt': No space left on device Using rsync, I get the following... rsync: close failed on "/home/fluffy/cloudBackup/.asdf.txt.qrBWe6": No space left on device (28) rsync error: error in file IO (code 11) at receiver.c(752) [receiver=3.0.8] rsync: connection unexpectedly closed (29 bytes received so far) [sender] rsync error: error in rsync protocol data stream (code 12) at io.c(601) [sender=3.0.8] I have full read/write permissions on the mounted share. I can copy locally and between the mount and system via SSH just fine. Any ideas? Thank you

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• Creating a Datatable Manually

  This sample shows how to create a datatable manually, adding files from a directory (using System.IO), and then binding the datatable to a Gridview

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• WHERE x = @x OR @x IS NULL

  - by steveh99999

  Every SQL DBA and developer should read the blog of MVP Erland Sommarskog – but particularly  his article on dynamic search conditions in T-SQL. I’ve linked above to his SQL 2005 article but his 2008 version is also a must-read. I seem to regularly come across uses of the SQL in the title above… Erland’s article explains in detail why this is inefficient, but I came across a nice example recently… A stored procedure contained the following code :- WHERE @Name is null or [Name] like @Name as a nonclustered index exists on the Name column, you might assume this would be handled efficiently by SQL Server. However, I got the following output from SET STATISTICS IO Table 'xxxxx'. Scan count 15, logical reads 47760, physical reads 9, read-ahead reads 13872, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0. Note the high number of logical reads… After a bit of investigation, we found that @Name could never actually be set to NULL in this particular example. ie the @x IS NULL was spurious… So, we changed the call to WHERE  [Name] like @Name Now, how much more efficient is this code ? Table 'xxxxx'. Scan count 3, logical reads 24, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0 A nice easy win in this case…… a full index scan has been replaced by a significantly more efficient index seek. I managed to recreate the same behaviour on Adventureworks – here’s a quick query to demonstrate :- USE adventureworks SET STATISTICS IO ON DECLARE @id INT = 51721 SELECT * FROM Sales.SalesOrderDetail WHERE @id IS NULL OR salesorderid = @id SELECT * FROM Sales.SalesOrderDetail WHERE salesorderid = @id Take a look at the STATISTICS IO output and compare the actual query plans used to prove the impact of  WHERE @id IS NULL. And just to follow some of Erland’s advice – here’s how you could get similar performance if it was possible that @id could actually sometimes contain NULL. DECLARE @sql NVARCHAR(4000), @parameterlist NVARCHAR(4000) DECLARE @id INT = 51721 – or change to NULL to prove query is functionally correct SET @sql = 'SELECT * FROM Sales.SalesOrderDetail WHERE 1 = 1' IF @id IS NOT NULL SET @sql = @sql + ' AND salesorderid = @id' IF @id IS NULL SET @sql = @sql + ' AND salesorderid IS NULL' SET @parameterlist = '@id INT' EXEC sp_executesql @sql, @parameterlist,@id Sometimes I think we focus too much on hardware and SQL Server configuration – when really the answer is focus on writing efficient SQL.

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• Stumbling Through: Visual Studio 2010 (Part IV)

  So finally we get to the fun part the fruits of all of our middle-tier/back end labors of generating classes to interface with an XML data source that the previous posts were about can now be presented quickly and easily to an end user.  I think.  Well see.  Well be using a WPF window to display all of our various MFL information that weve collected in the two XML files, and well provide a means of adding, updating and deleting each of these entities using as little code as possible.  Additionally, I would like to dig into the performance of this solution as well as the flexibility of it if were were to modify the underlying XML schema.  So first things first, lets create a WPF project and include our xml data in a data folder within.  On the main window, well drag out the following controls: A combo box to contain all of the teams A list box to show the players of the selected team, along with add/delete player buttons A text box tied to the selected players name, with a save button to save any changes made to the player name A combo box of all the available positions, tied to the currently selected players position A data grid tied to the statistics of the currently selected player, with add/delete statistic buttons This monstrosity of a form and its associated project will look like this (dont forget to reference the DataFoundation project from the Presentation project): To get to the visual data binding, as we learned in a previous post, you have to first make sure the project containing your bindable classes is compiled.  Do so, and then open the Data Sources pane to add a reference to the Teams and Positions classes in the DataFoundation project: Why only Team and Position?  Well, we will get to Players from Teams, and Statistics from Players so no need to make an interface for them as well see in a second.  As for Positions, well need a way to bind the dropdown to ALL positions they dont appear underneath any of the other classes so we need to reference it directly.  After adding these guys, expand every node in your Data Sources pane and see how the Team node allows you to drill into Players and then Statistics.  This is why there was no need to bring in a reference to those classes for the UI we are designing: Now for the seriously hard work of binding all of our controls to the correct data sources.  Drag the following items from the Data Sources pane to the specified control on the window design canvas: Team.Name > Teams combo box Team.Players.Name > Players list box Team.Players.Name > Player name text box Team.Players.Statistics > Statistics data grid Position.Name > Positions combo box That is it!  Really?  Well, no, not really there is one caveat here in that the Positions combo box is not bound the selected players position.  To do so, we will apply a binding to the position combo boxs SelectedValue to point to the current players PositionId value: That should do the trick now, all we need to worry about is loading the actual data.  Sadly, it appears as if we will need to drop to code in order to invoke our IO methods to load all teams and positions.  At least Visual Studio kindly created the stubs for us to do so, ultimately the code should look like this: Note the weirdness with the InitializeDataFiles call that is my current means of telling an IO where to load the data for each of the entities.  I havent thought of a more intuitive way than that yet, but do note that all data is loaded from Teams.xml besides for positions, which is loaded from Lookups.xml.   I think that may be all we need to do to at least load all of the data, lets run it and see: Yay!  All of our glorious data is being displayed!  Er, wait, whats up with the position dropdown?  Why is it red?  Lets select the RB and see if everything updates: Crap, the position didnt update to reflect the selected player, but everything else did.  Where did we go wrong in binding the position to the selected player?  Thinking about it a bit and comparing it to how traditional data binding works, I realize that we never set the value member (or some similar property) to tell the control to join the Id of the source (positions) to the position Id of the player.  I dont see a similar property to that on the combo box control, but I do see a property named SelectedValuePath that might be it, so I set it to Id and run the app again: Hey, all right!  No red box around the positions combo box.  Unfortunately, selecting the RB does not update the dropdown to point to Runningback.  Hmmm.  Now what could it be?  Maybe the problem is that we are loading teams before we are loading positions, so when it binds position Id, all of the positions arent loaded yet.  I went to the code behind and switched things so position loads first and no dice.  Same result when I run.  Why?  WHY?  Ok, ok, calm down, take a deep breath.  Get something with caffeine or sugar (preferably both) and think rationally. Ok, gigantic chocolate chip cookie and a mountain dew chaser have never let me down in the past, so dont fail me now!  Ah ha!  of course!  I didnt even have to finish the mountain dew and I think Ive got it:  Data Context.  By default, when setting on the selected value binding for the dropdown, the data context was list_team.  I dont even know what the heck list_team is, we want it to be bound to our team players view source resource instead, like this: Running it now and selecting the various players: Done and done.  Everything read and bound, thank you caffeine and sugar!  Oh, and thank you Visual Studio 2010.  Lets wire up some of those buttons now There has got to be a better way to do this, but it works for now.  What the add player button does is add a new player object to the currently selected team.  Unfortunately, I couldnt get the new object to automatically show up in the players list (something about not using an observable collection gotta look into this) so I just save the change immediately and reload the screen.  Terrible, but it works: Lets go after something easier:  The save button.  By default, as we type in new text for the players name, it is showing up in the list box as updated.  Cool!  Why couldnt my add new player logic do that?  Anyway, the save button should be as simple as invoking MFL.IO.Save for the selected player, like this: MFL.IO.Save((MFL.Player)lbTeamPlayers.SelectedItem, true); Surprisingly, that worked on the first try.  Lets see if we get as lucky with the Delete player button: MFL.IO.Delete((MFL.Player)lbTeamPlayers.SelectedItem); Refresh(); Note the use of the Refresh method again I cant seem to figure out why updates to the underlying data source are immediately reflected, but adds and deletes are not.  That is a problem for another day, and again my hunch is that I should be binding to something more complex than IEnumerable (like observable collection). Now that an example of the basic CRUD methods are wired up, I want to quickly investigate the performance of this beast.  Im going to make a special button to add 30 teams, each with 50 players and 10 seasons worth of stats.  If my math is right, that will end up with 15000 rows of data, a pretty hefty amount for an XML file.  The save of all this new data took a little over a minute, but that is acceptable because we wouldnt typically be saving batches of 15k records, and the resulting XML file size is a little over a megabyte.  Not huge, but big enough to see some read performance numbers or so I thought.  It reads this file and renders the first team in under a second.  That is unbelievable, but we are lazy loading and the file really wasnt that big.  I will increase it to 50 teams with 100 players and 20 seasons each - 100,000 rows.  It took a year and a half to save all of that data, and resulted in an 8 megabyte file.  Seriously, if you are loading XML files this large, get a freaking database!  Despite this, it STILL takes under a second to load and render the first team, which is interesting mostly because I thought that it was loading that entire 8 MB XML file behind the scenes.  I have to say that I am quite impressed with the performance of the LINQ to XML approach, particularly since I took no efforts to optimize any of this code and was fairly new to the concept from the start.  There might be some merit to this little project after all Look out SQL Server and Oracle, use XML files instead!  Next up, I am going to completely pull the rug out from under the UI and change a number of entities in our model.  How well will the code be regenerated?  How much effort will be required to tie things back together in the UI?Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Alerts are good, aren't they?

  - by fatherjack

  It is accepted best practise to set some alerts on every SQL instance you install. They aren't particularly well publicised but I have never seen any one not recommend setting up alerts for Error 823, 824 and 825. These alerts are focussed on successful access(IO) to the hard drives that SQL Server is using. If there are  any errors when reading or writing to the drives then one of these errors will be returned. Having the alerts on these errors means that any IO issues will be brought to the...(read more)

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• VMWare Player pauses often

  - by pascal

  I'm using a 64bit Windows 8 inside vmplayer, with 2 virtual processor cores, virtual hard disk resides on a fast local disc and is not preallocated; host CPU is Intel i7 3770, should be capable of hardware virtualisation but I don't know if VMWare uses it; NAT networking; Sound card connected, USB connected, accelerated 3D graphics (NVidia 313.30 on host) My problem is, that the VM often pauses for a few seconds, and then speeds up for a few seconds to reach real time again. Time in the VM actually moves faster after the pause, for example all animations using timers speed up. When running, the vmware-vmx process shows ~150% CPU usage in top, but 0% when pausing (and D state i.e. waiting for IO). iotop shows normal disk writes from vmware-vmx threads, but during pauses, the flush kernel thread uses 99%. Are there some options to try so that VMWare doesn't wait for IO? I've tried a few things available from the GUI but the issue never went away…

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