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• Are there some general Network programming best practices?

  - by uriDium

  I am implementing some networking stuff in our project. It has been decided that the communication is very important and we want to do it synchronously. So the client sends something the server acknowledges. Are there some general best practices for the interaction between the client and the server. For instance if there isn't an answer from the server should the client automatically retry? Should there be a timeout period before it retries? What happens if the acknowledgement fails? At what point do we break the connection and reconnect? Is there some material? I have done searches but nothing is really coming up. I am looking for best practices in general. I am implementing this in c# (probably with sockets) so if there is anything .Net specific then please let me know too.

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• Is there a way to reuse an XmlReader?

  - by uriDium

  I have a process that uses an XmlReader. I have already done a lot to squeeze maximum performance out of it. So far we have had huge gains from using the Reader as opposed to XmlDoc or DataSet.GetXml(). We expect to get XML many times a second and I would like to avoid the overhead of recreating the reader every time. I have already cached the XmlReaderSettings but is there anyway to reuse the XmlReader or do I need to recreate it every time?

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• Is using ReaderWriterLockSlim a bad idea for long lived objects?

  - by uriDium

  I am trying to track down the reason that an application has periods of bad performance. I think that I have linked the bad performance to the points where Garbage Collection is run for Gen 2. I get a profiling tool (CLR Profiler) and was quite surprised by the results. In my test I was spawning and processing millions of objects. However the biggest hog of the Gen 2 space comes from something Called Threading.ReaderWriterCount which comes from System.Threading.ReaderWriterLockSlim::InitializeThreadCounts. I know nothing about the inner workings of ReaderWriterLockSlim but from what I am getting from the reports it is okay to have 1 or 2 Locks for longer lived objects but try and use other locks if you are going to have many smaller objects. Does anyone have any comments or experience with ReaderWriterLockSlim and/or what to look for if it seems that GC is killing application performance?

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• What happens to the output to a log4net console appender in a Windows service?

  - by uriDium

  I have a console project that I have been working on. I added log4net to handle all my logging. In some places I have made use of the console appender. When I turn this application into a Windows Service should I just remove the console appender or what happens to that output? Does it just get lost? I would like to keep it if all possible because if I run it straight from the command prompt I would like to see the console output to help debug things.

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• Is there a way to set the maximum number of error messages a log4net memory appender can contain?

  - by uriDium

  I would like to add a memory appender to the root logger so that I can connect to the application and get the last 10 events. I only ever want to keep the last 10. I am worried about this appender consuming all too much memory. The application is designed to run 24/7. Or is there another way?

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• Obfuscating ASP.Net dll breaks web application.

  - by uriDium

  I wouldn't usually bother to obfuscate a web application DLL but right now I have to share some server space with someone who might have a conflict of interest and might be tempted to steal the deal and decompile it. Not an ideal solution I know but hey. So I am using VS 2005, a web deployment project (which compiles into a single DLL) and Dotfuscator community edition. When I obfuscate the DLL the web application breaks and I get some message like Could not load type 'Browse' from assembly MyAssembly So I searched around and found that if I disable renaming then it should fix it. Which it does. But now when I look at the DLL using .Net reflector I can see everything again. So this seems kind of pointless. Is there a way to get this to work? Is there a better way to protect my DLL from someone I have to share a server with? UPDATE: I figured out my problem. All the classnames have changed but now all my <%@ Page Language="C#" AutoEventWireup="true" CodeFile="mycode.aspx.cs" Inherits="mycode" % is incorrect because mycode no longer exists. It is now aef or something. Is there any tool out there that will also change the names of the Codefile and Inherits tags?

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• Should the code being tested compile to a DLL or an executable file?

  - by uriDium

  I have a solution with two projects. One for project for the production code and another project for the unit tests. I did this as per the suggestions I got here from SO. I noticed that in the Debug Folder that it includes the production code in executable form. I used NUnit to run the tests after removing the executable and they all fail trying to find the executable. So it definitely is trying to find it. I then did a quick read to find out which is better, a DLL or an executable. It seems that an DLL is much faster as they share memory space where communication between executables is slower. Unforunately our production code needs to be an exectuable. So the unit tests will be slightly slower. I am not too worried about that. But the project does rely on code written in another library which is also in executable format at the moment. Should the projects that expose some sort of SDK rather be compiled to an DLL and then the projects that use the SDK be compiled to executable?

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• Why does using the Asynchronous Programming Model in .Net not lead to StackOverflow exceptions?

  - by uriDium

  For example, we call BeginReceive and have the callback method that BeginReceive executes when it has completed. If that callback method once again calls BeginReceive in my mind it would be very similar to recursion. How is that this does not cause a stackoverflow exception. Example code from MSDN: private static void Receive(Socket client) { try { // Create the state object. StateObject state = new StateObject(); state.workSocket = client; // Begin receiving the data from the remote device. client.BeginReceive( state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReceiveCallback), state); } catch (Exception e) { Console.WriteLine(e.ToString()); } } private static void ReceiveCallback( IAsyncResult ar ) { try { // Retrieve the state object and the client socket // from the asynchronous state object. StateObject state = (StateObject) ar.AsyncState; Socket client = state.workSocket; // Read data from the remote device. int bytesRead = client.EndReceive(ar); if (bytesRead > 0) { // There might be more data, so store the data received so far. state.sb.Append(Encoding.ASCII.GetString(state.buffer,0,bytesRead)); // Get the rest of the data. client.BeginReceive(state.buffer,0,StateObject.BufferSize,0, new AsyncCallback(ReceiveCallback), state); } else { // All the data has arrived; put it in response. if (state.sb.Length > 1) { response = state.sb.ToString(); } // Signal that all bytes have been received. receiveDone.Set(); } } catch (Exception e) { Console.WriteLine(e.ToString()); } }

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• In which controller do you put the CRUD for the child part of a relationship?

  - by uriDium

  I am using ASP.Net MVC but this probably applies to all MVC patterns in general. My problem, for example I have companies and in each company I have a list of contacts. When I have selected a company I can see its details and a list of the contacts for that company. When I want to add a new contact for that company, should the implementation of that action go into the company controller as an "AddContact" action or should it go into the contact controller into a "New" action and we pass the Company ID in the URL? What is the usual way of dealing with this sort of thing in ASP.Net MVC? Is there a better stategy?

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• How can I bind an Enum to a DbType of bit or int?

  - by uriDium

  Hi I am using Linq2Sql and want to bind an objects field (which is enum) to either a bit or a int type in the database. For example I want have a gender field in my model. I have already edited the DBML and changed the Type to point to my enum. I want to create Radio buttons (which I think I have figured out) for gender and dropdown lists for other areas using the same idea. My enum looks like this public enum Gender { Male, Female } Mapping between DbType 'int' and Type 'Project.Models.Gender' in Column 'Gender' of Type 'Candidate' is not supported. Any ideas on how to do this mapping. Am I missing something on the enums.

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• Why is Log4Net not creating log file in production?

  - by uriDium

  I am using VS2005, a website project, a web deployment project and Log4Net. I can use logging when I am developing locally. I can see the log files and everything is fine. When I build my website, (using the web deployment project), I use the deploy as a single DLL option. When I then check the locations of where my log files should be I cannot see any files. Is there a way to troubleshoot this. I don't think adding the debug value to the App Settings will help because I don't have a console because it is a website. EDIT I don't want the 150 rep to go to waste so one last time. I compared the internal trace from my dev environment to the trace from the production. My dev environment trace shows the call the Xml Configurator where the production one does not. I have code in the global.asax on application_start() method. I put debug code in there and it is getting called in dev but not in production. I think this is where the web deployment project is causing some issues. Does the global.asax get compiled into the single DLL? When I do a build in the deployment directory I see a global.compiled file. Must this go into the bin folder in production? Or is the global.asax code in the single DLL? Having both in the bin folder or the just the DLL didn't change anything.

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• Why does ElapsedTicks X 10 000 not equal ElapsedMilliseconds for .Net's Stopwatch?

  - by uriDium

  I am trying to performance test some code. I am using a stopwatch. When I output the number of milliseconds it always tells me 0 so I thought that I would try the number of ticks. I am seeing that the number of ticks is about 20 000 to 30 000. Looking at the MSDN at TimeSpan.TicksPerMillisecond it says that is 10 000 ticks per millisecond. In that case why are the elapsed milliseconds on my stopwatch not appearing as 2 or 3? What am I missing? I have even outputed the result on the same line. This is what I get. Time taken: 26856 ticks, 0 ms And it is constant.

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• How can I set the tab on a webpage depending on which page you come from in ASP.Net MVC?

  - by uriDium

  I have a rather large entity. It has a parent relationship with many different child tables. Each of the child tables I have represented as a tab (luckily it makes sense and looks nice and makes things easier to navigate). If the users wants to add a new child row, they go the particular tab, and there they see a list of rows which is owned by the parent and they can do the usual CRUD. The CRUD takes them to a new controller and action and passes the ID of the parent to the action. (This is as far as I can tell what I was meant to do, any other ideas??) When they have finsihed they click save and it takes them back to the original page BUT I want it to automatically go to the right tab. How can I do this? I am using Jquery UI tabs, ASP.Net MVC 2.0. One idea I had was to just go back to the bookmark (the href part with the #, for e.g. /Parent/Details/4/#tabname). Apparently JQuery UI tabs can handle this. Or to set the tab name as part of the query string (/Parent/Details/4?tab=name) What is the best practise here?

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• Dropdownlist value not being set when there is a default blank option

  - by uriDium

  I am using ASP.Net MVC. I have a partial view which has a form with dropdownlists. The dropdownlists are set via ViewData. The partial view is used in a Create and Edit page. The create works fine. I get the dropdownlists and the blank option is a "Please select", like so <%= Html.DropDownList("ContactNrType", ViewData["ContactNrType"] as SelectList, "Please Select") %> But this doesn't seem to work for my edit. If I have that extra "Please select" parameter then it does not select the value for the drop down. I am setting the value of the drop down in the controller like so ViewData["ContactNrType"] = new SelectList(new List<string> { "Mobile", "Home", "Work", "Friend" }, candidate.ContactNrType); Any idea as to what I am doing wrong? I want to share the partial view which contains the form between the two pages. So I need the "Please Select" option for the Create. And I need the value set for the Edit (I don't mind that it has an option that still says "Please Select").

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• Is it okay to violate the principle that collection properties should be readonly for performance?

  - by uriDium

  I used FxCop to analyze some code I had written. I had exposed a collection via a setter. I understand why this is not good. Changing the backing store when I don't expect it is a very bad idea. Here is my problem though. I retrieve a list of business objects from a Data Access Object. I then need to add that collection to another business class and I was doing it with the setter method. The reason I did this was that it is going to be faster to make an assignment than to insert hundreds of thousands of objects one at a time to the collection again via another addElement method. Is it okay to have a getter for a collection in some scenarios? I though of rather having a constructor which takes a collection? I thought maybe I could pass the object in to the Dao and let the Dao populate it directly? Are there any other better ideas?

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• Is there a version of JQuery 1.4.2. with Intellisense yet?

  - by uriDium

  Does anybody know how/when/why/who/where of if the JQuery intellisense files live for JQuery 1.4.2. On the Google Code pages the most up to date version that I can find is 1.3.2.

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• Why can I not have two SocketServers bound to two different ports in the same application?

  - by uriDium

  I am using .Net 3.5 and Windows XP not sure if any more information is needed. I have an application that creates a socket, binds to a port and starts listening. A client comes and connects and then disconnects no problem. It can then reconnect no problem. If I have to sockets each listening on a different (e.g. 50 000 and 55 000) then it will accept the connection but it will not allow a reconnect. I will post source code if needed but I am assuming that it is just something simple that I am not catching.

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• Should all methods that have a return value be turned into a property?

  - by uriDium

  I was just thinking about it and since .Net has introduced properties is there ever a situation where you would want to leave your code as a method that returns a value as opposed to a readonly property.

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