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  • Build an ASP.NET 3.5 Guestbook using MS SQL Server and VB.NET

    One of the most important website features is a guest book. This is particularly useful if you need to know the responses and reactions of your website s visitors. With the release of ASP.NET 3.5 and Visual Web Developer Express 2 8 several web controls make it possible to create an ASP.NET application without the need to hard manually code everything including database scripts server side scripts etc. You can see how that would be helpful to writing a guest book. This is the first part of a multi-part series.... SW Deployment Automation Best Practices Free Guide for IT Leaders: Overcoming Software Distribution & Mgmt Challenges.

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  • Querying Literals in Entity SQL

    Entity SQL might surprise you if you are building query expressions with some non-string types. Ive blogged about this before with the DateTime literal after trying to use a string to represent the date in my query as Im used to with TSQL. Here is a snip from that post: SELECT VALUE BAModel.Contact(c.ContactID,c.FirstName,c.LastName,c.Title,c.AddDate,c.ModifiedDate) FROM dbo.Contact as c WHERE c.AddDate>="1/1/2007" I was trying to emulate T-SQL here but I need...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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  • Much ado about NULL: Exploiting a kernel NULL dereference

    <b>Ksplice:</b> "We think that it&#8217;s important for developers and system administrators to be more knowledgeable about the attacks that black hats regularly use to take control of systems, and so, today, we&#8217;re going to start from where we left off and go all the way to a working exploit for a NULL pointer dereference in a toy kernel module."

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  • blender: 3D model from guide images

    - by Stefan
    In a effort to learn the blender interface, which is confusing to say the least, I've chosen to model a model from referrence pictures easily found on the web. Problem is that I can't ( and won't ) get perfect "right", "front" and "top" pictures. Blender only allows you to see the background pictures when in ortographic mode and only from right|front|top, which doesn't help me. How to I proceed to model from non-perfect guide images?

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  • Entity Framework 4.0 POCO Classes and Data Services

    If you've flipped on the POCO (Plain Ol' CLR Objects) code generation T4 templates for Entity Framework to enable testing or just 'cuz you like the code better, you might find that you lack the ability to expose that same model via Data Services as OData (Open Data). If you surf to the feed, you'll likely see something like this: The XML page cannot be displayed Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button, or try again later....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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  • Hadoop, NOSQL, and the Relational Model

    - by Phil Factor
    (Guest Editorial for the IT Pro/SysAdmin Newsletter)Whereas Relational Databases fit the world of commerce like a glove, it is useless to pretend that they are a perfect fit for all human endeavours. Although, with SQL Server, we’ve made great strides with indexing text, in processing spatial data and processing markup, there is still a problem in dealing efficiently with large volumes of ephemeral semi-structured data. Key-value stores such as Cassandra, Project Voldemort, and Riak are of great value for ephemeral data, and seem of equal value as a data-feed that provides aggregations to an RDBMS. However, the Document databases such as MongoDB and CouchDB are ideal for semi-structured data for which no fixed schema exists; analytics and logging are obvious examples. NoSQL products, such as MongoDB, tackle the semi-structured data problem with panache. MongoDB is designed with a simple document-oriented data model that scales horizontally across multiple servers. It doesn’t impose a schema, and relies on the application to enforce the data structure. This is another take on the old ‘EAV’ problem (where you don’t know in advance all the attributes of a particular entity) It uses a clever replica set design that allows automatic failover, and uses journaling for data durability. It allows indexing and ad-hoc querying. However, for SQL Server users, the obvious choice for handling semi-structured data is Apache Hadoop. There will soon be an ODBC Driver for Apache Hive .and an Add-in for Excel. Additionally, there are now two Hadoop-based connectors for SQL Server; the Apache Hadoop connector for SQL Server 2008 R2, and the SQL Server Parallel Data Warehouse (PDW) connector. We can connect to Hadoop process the semi-structured data and then store it in SQL Server. For one steeped in the culture of Relational SQL Databases, I might be expected to throw up my hands in the air in a gesture of contempt for a technology that was, judging by the overblown journalism on the subject, about to make my own profession as archaic as the Saggar makers bottom knocker (a potter’s assistant who helped the saggar maker to make the bottom of the saggar by placing clay in a metal hoop and bashing it). However, on the contrary, I find that I'm delighted with the advances made by the NoSQL databases in the past few years. Having the flow of ideas from the NoSQL providers will knock any trace of complacency out of the providers of Relational Databases and inspire them into back-fitting some features, such as horizontal scaling, with sharding and automatic failover into SQL-based RDBMSs. It will do the breed a power of good to benefit from all this lateral thinking.

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  • ASP.NET 4.0 and the Entity Framework 4 - Part 4 - A 3 Layered Approach to the Entity Framework

    In this article, Vince suggests a pattern to use when developing a three layered application using the Entity Framework 4. After providing a short introduction he demonstrates the creation of the database, data access layer, business logic layer, and a web form. He does so with the help of detailed explanations, source code examples and related screenshots. He also examines how to select records to load a Drop Down List, including adding, editing and deleting records.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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  • How can I convince my company to move to MVC?

    - by guanome
    I currently write web apps using asp.net web forms and getting my company to move to another technology is like [insert funny line here]. I would really like to start writing apps using MVC, but they fear any type of change. How is the best way to convince/ease them into using MVC? I guess this can go for moving to any new technology. Update Decided to go the rogue developer route and just started using it. I recreated a small app in MVC and learned the ropes that way, and moved up from there.

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  • OpenGL Drawing textured model (OBJ) black texture

    - by andrepcg
    I'm using OpenGL, Glew, GLFW and Glut to create a simple game. I've been following some tutorials and I have now a good model importer with textures (from ogldev.atspace.co.uk) but I'm having an issue with the model textures. I have a skybox with a beautiful texture as you can see in the picture That weird texture behind the helicopter (model) is the heli model that I've applied on purpose to that wall to demonstrate that specific texture is working, but not on the helicopter. I'll include the files I'm working on so you can check it out. Mesh.cpp - http://pastebin.com/pxDuKyQa Texture.cpp - http://pastebin.com/AByWjwL6 Render function + skybox - http://pastebin.com/Vivc9qnT I'm just calling mesh->Render(); before the drawSkyBox function, in the render loop. Why is the heli black when I can perfectly apply its texture to another quad? I've debugged the code and the mesh-render() call is correctly fetching the texture number and passing it to the texture-bind() function.

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  • 3d Model Scaling With Camera

    - by spasarto
    I have a very simple 3D maze program that uses a first person camera to navigate the maze. I'm trying to scale the blocks that make up the maze walls and floor so the corridors seem more roomy to the camera. Every time I scale the model, the camera seems to scale with it, and the corridors always stay the same width. I've tried apply the scale to the model in the content pipe (setting the scale property of the model in the properties window in VS). I've also tried to apply the scale using Matrix.CreateScale(float) using the Scale-Rotate-Transform order with the same result. If I leave the camera speed the same, the camera moves slower, so I know it's traversing a larger distance, but the world doesn't look larger; the camera just seems slower. I'm not sure what part of the code to include since I don't know if it is an issue with my model, camera, or something else. Any hints at what I'm doing wrong? Camera: Projection = Matrix.CreatePerspectiveFieldOfView( MathHelper.PiOver4, _device.Viewport.AspectRatio, 1.0f, 1000.0f ); Matrix camRotMatrix = Matrix.CreateRotationX( _cameraPitch ) * Matrix.CreateRotationY( _cameraYaw ); Vector3 transCamRef = Vector3.Transform( _cameraForward, camRotMatrix ); _cameraTarget = transCamRef + CameraPosition; Vector3 camRotUpVector = Vector3.Transform( _cameraUpVector, camRotMatrix ); View = Matrix.CreateLookAt( CameraPosition, _cameraTarget, camRotUpVector ); Model: World = Matrix.CreateTranslation( Position );

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  • Git commit messages with nvie branching model

    - by eykanal
    This Git branching model recommends branching for all development efforts and merging when complete: Branch Develop Merge when complete I'm wondering how this works in practice, given that performing a merge off this model will simply add a commit to the develop with whatever commit message happened to be the last one in line. Do people using this model do an interactive rebase on the feature branch before committing? If not, how do you ensure that the commits make sense on the main branch?

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  • There are 2 jobs available - which one sounds better all round [closed]

    - by Steve Gates
    I am currently employed at a company where we scrape by each year breaking even, sometimes having a little profit. The development environment is very relaxed and we have a laugh. My colleagues are not interested in improving their knowledge unless they have to, so trying to get them to adopt things like TDD is a non-starter. My development manager is stuck in .Net 2 land and refuses to use things like LINQ. He over complicates architecture and writes very unreadable code, heres an example SortedList<int,<SortedList<int,SortedList<int, MyClass>>>> The MD of the company has no drive and lets the one sales guy bring in the contracts. We are not busy all the time and this allows me time to look at new technology and learn. In terms of using things like TDD, my development manager has no problem with it and can kind of see the purpose of it, he just wont use it himself. This means I am alone in learning new things and am often resorting to StackOverflow to make sure I get things right. The company has a lot of flexibility, I can work from home if needs be and when my daughter was born they let me work from home 1 day a week however they expect this flexibility in return often asking me to travel occasionally on a Friday afternoon for the following week. Sometimes its abroad. We are also pretty much on call 24/5 as we have engineers in various countries. Also we have no testers so most of the testing is done by us developers and some testing by engineers. Either way no-one likes testing! I have been offered a role at a company I worked at 5 years ago. They were quite Victorian in their working practices but it appears to have relaxed now although I suspect still reasonably formal. There is a new team of developers I don't know and they are about to move to new offices. The team lead is a guy that was there when I was and I get the impression he takes his role seriously and likes his formal procedures and documentation. I think some of the Victorian practices may have rubbed off on him. However he did say if things crop up then as long as I can trust the person they can work at home although he prefers people in the office. The team uses SCRUM, TDD and SOLID design principles so they are quite up to date in technology. They are reasonably Microsoft focused. It appears the Technical Director might be the R&D man and research new technology on his own not allowing developers to play with new technology. He possibly might be a super developer and makes all the decisions that no can argue with. They are currently moving to Entity Framework away from NHibernate based on issues that their queries seem to fail sometimes and they feel NHibernate is stagnant. They have analysts and a QA team. The MD is focused and they are an expanding company making profit each year. I'm not sure what the team morale is and whether they have a laugh. When I had a tour around the office they were there in dead silence. I'm really unsure which role is the best for me and going with my gut instinct is useless as I'm not sure what my gut is telling me. Based on the information above which role would you choose and why?

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  • Description of the ASP.NET update for the .NET Framework 3.5 Service Pack 1 and the .NET Framework 2

    976765 ... Description of the ASP.NET update for the .NET Framework 3.5 Service Pack 1 and the .NET Framework 2.0 Service Pack 2 on Windows XP and on Windows Server 2003: June 8, 2010This RSS feed provided by kbAlerz.com.Visit kbAlertz.com to subscribe. It's 100% free and you'll be able to recieve e-mail or RSS updates for the technologies you pick from the Microsoft Knowledge Base....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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  • Material usage, one per model or per object?

    - by WSkid
    Is it better (memory, time (of developer), space) to use single model that is unwrapped and uses a single material or to break a model down into appropriate bits, each with their own smaller texture/material? Or does it depend on the target platform as to what is acceptable - ie PC vs tablet? An example: Say you have a typical house with a tiled roof. Model it, make sure everything is attached, unwrap the walls/roof so in your UV template the walls and roof would be in one texture file, side-by-side in say a 512x512 file. Model the roof/walls as separate objects, unwrap them individually and have two UV templates. You could then have a 256x256 file for each one.

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  • asp.net web apps: are OnServerValidate necessary with custom validators

    - by peroija
    I recently created a .net web app that used over 200 custom validators on one page. I wrote code for both ClientValidationFunction and OnServerValidate which results in a ton of repetitive code. My sql statements are parameterized, I have functions that pull data from input fields and validates them before passing to the sql statements or stored procedures. And the javascript validates the fields before the page submits. So essentially the data is clean and valid before it even hits the OnServerValidate and clean after it anyways due to the aforementioned steps. This makes me question, is OnServerValidate really needed when I validate on the clientside?

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  • Check If a SQL Server Database Is In Pseudo-Simple Recovery Model Using Windows PowerShell

    Check if databases are really in FULL recovery model with a recovery model called pseudo-simple, where the database still behaves like it is still in SIMPLE recovery model until a full database backup is taken. Get your SQL Server database under version control now!Version control is standard for applications, but databases haven’t caught up. So how can you bring database development up to speed? Why should you start? Find out…

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  • Subscribe/Publish Model in Web-based Application (c#) - Best Practices for Event Handlers

    - by KingOfHypocrites
    I was recently exposed to a desktop application that uses an publish/subscribe model to handle commands, events, etc. I can't seem to find any good examples of using this in a web application, so I wonder if I am off base in trying to use this for web based development (on the server side)? I'm using asp.net c#. My main question in regards to the design is: When using a publish/subscribe model, is it better to have generic commands/events that pass no parameters and then have the subscribers look at static context objects that contain the data relevant to the event? Or is it better to create custom arguments for every event that contain data related to the event? The whole concept of a global container seems so convenient but at the same time seems to break encapsulation. Any thoughts or best practices from anyone who has implemented this type of model in a web based application? Even suggestions on this model out of the scope of my question are appreciated.

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  • Programming Entity Framework, 2nd Edition (EF4) Table of Contents

    We are closing in on finalizing the 2nd edition of Programming Entity Framework! Although the rough draft chapters are already available through Safari’s Rough Cuts program (here: http://oreilly.com/catalog/9780596807252) I have been editing and reshaping the content since those chapters were published. You can get the final print edition (August 15th or perhaps a bit earlier) at O’Reilly or pre-order it here on Amazon.com (here) (and elsewhere of course!) I believe that the book will...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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  • ASP.NET Image to PDF with VB.Net

    This tutorial will discuss how to use the PDFSharp library on images. Specifically it will cover how to do simple JPG to PDF conversion using PDFSharp in VB.NET. This has a lot of applications in ASP.NET implementations such as converting a document online that contains either a pure image or both text and images.... Comcast? Business Class - Official Site Learn About Comcast Small Business Services. Best in Phone, TV & Internet.

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  • ASP.NET Web Form Model with Partial Rendering and Events

    This article explains the Event based ASP.NET Web Form programming model for a web application with reference to partial rendering and AJAX asynchronous postback....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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  • Domain Model and Querying

    - by Tyrsius
    I am new to DDD, having worked only in Transaction-Script apps with an anemic model, or just Big Balls of Mud, so please forgive any terminology I abuse. I am trying to understand the proper separation between the domain model and the repository. What is the proper way to construct a domain object that is coming from a database, assuming the (incredibly simplified) need to query for objects by status (returns enumerable), or by ID. Should a factory be building the objects, exposing methods for GetByStatus() and GetByID(), using a DIed repository? Should a repository be called directly, knowing how to build a domain model from the DTO? Should the domain model have a constructor for get by ID, using a DIed repoistory to load the initial state, using some other (?) method for the list? I am not really sure what the best way would be, and this question has an answer advocating each one (these are certainly mutuallu exclusive).

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  • asp.net external form loading into jquery dialog submit button issue

    - by Mark
    I am loading an external file 'contact_us.aspx' into a jquery dialog box. the external page contains a form. When the submit button is pressed it closes the dialog box and changes the page to contact_us.aspx. is my code correct or is there a different way of doing this. see my code below, thanks. This JS is in y masterpage: <script type="text/javascript"> $(document).ready(function() { var dialogOpts = { modal: true, bgiframe: true, autoOpen: false, height: 500, width: 500, open: function(type, data) { $(this).parent().appendTo(jQuery("form:first")); } } $("#genericContact").dialog(dialogOpts); //end dialog $('a.conactGeneric').click( function() { $("#genericContact").load("contact_us.aspx", [], function() { $("#genericContact").dialog("open"); } ); return false; } ); }); </script> The external file 'contact_us.aspx' which is loaded into the dialog box, when the link is clicked. <asp:Panel ID="pnlEnquiry" runat="server" DefaultButton="btn_Contact"> <asp:Label ID="lblError" CssClass="error" runat="server" Visible="false" Text=""></asp:Label> <div class="contact_element"> <label for="txtName">Your Name <span>*</span></label> <asp:TextBox CssClass="contact_field" ID="txtName" runat="server"></asp:TextBox> <asp:RequiredFieldValidator CssClass="contact_error" ControlToValidate="txtName" Display="Dynamic" ValidationGroup="valContact" ID="RequiredFieldValidator1" runat="server" ErrorMessage="Enter your name"></asp:RequiredFieldValidator> </div> <div class="contact_element"> <label for="txtName">Phone Number</label> <asp:TextBox CssClass="contact_field" ID="txtTel" runat="server"></asp:TextBox> <asp:RequiredFieldValidator CssClass="contact_error" ControlToValidate="txtTel" Display="Dynamic" ValidationGroup="valContact" ID="RequiredFieldValidator2" runat="server" ErrorMessage="Enter your phone number"></asp:RequiredFieldValidator> </div> <div class="contact_element"> <label for="txtEmail">Your Email <span>*</span></label> <asp:TextBox CssClass="contact_field" ID="txtEmail" runat="server"></asp:TextBox> <asp:RequiredFieldValidator CssClass="contact_error" ControlToValidate="txtEmail" Display="Dynamic" ValidationGroup="valContact" ID="RequiredFieldValidator3" runat="server" ErrorMessage="Enter your email address"></asp:RequiredFieldValidator> </div> <div class="contact_element"> <label for="txtQuestion">Question <span>*</span></label> <asp:TextBox TextMode="MultiLine" CssClass="contact_question" ID="txtQuestion" runat="server"></asp:TextBox> <asp:RequiredFieldValidator CssClass="contact_error" ControlToValidate="txtQuestion" Display="Dynamic" ValidationGroup="valContact" ID="RequiredFieldValidator4" runat="server" ErrorMessage="Enter your question"></asp:RequiredFieldValidator> </div> <div class="contact_chkbox"> <asp:CheckBox ID="chkNews" runat="server" Checked="true" Text="Receive our monthly newsletter" EnableTheming="false" /> </div> <span class="mandatory">* Required Field</span> <asp:LinkButton ID="btn_Contact" ToolTip="Submit" CssClass="submit_btn" ValidationGroup="valContact" runat="server" OnClick="SignUp" ></asp:LinkButton> <asp:RegularExpressionValidator CssClass="contact_error" ID="RegularExpressionValidator1" runat="server" ValidationExpression=".*@.{2,}\..{2,}" Display="Dynamic" ValidationGroup="valContact" ControlToValidate="txtEmail" ErrorMessage="Invalid email format."></asp:RegularExpressionValidator> <asp:ValidationSummary ID="ValidationSummary1" ValidationGroup="valContact" ShowMessageBox=true ShowSummary=false runat="server" /> </asp:Panel> <asp:Panel ID="pnlThanks" runat="server" Visible="false"> <h1>Thank you!</h1> </asp:Panel> code behind file: protected void SignUp(object sender, EventArgs e) { SmtpMail.SmtpServer = "localhost"; MailMessage myMail = new MailMessage(); //String myToEmail = MyDB.getScalar("select setting_value from [Website.Settings]"); ; //myMail.To = myToEmail; myMail.To = "[email protected]"; myMail.From = "[email protected]"; //myMail.Bcc = "[email protected]"; myMail.Subject = "Enquiry from the Naturetrek Site"; StringBuilder myContent = new StringBuilder(); myContent.Append("Name : " + txtName.Text + "\r\n"); myContent.Append("Email: " + txtEmail.Text + "\r\n"); myContent.Append("Telephone: " + txtTel.Text + "\r\n"); myContent.Append("\r\nTheir Question: \r\n" + txtQuestion.Text + "\r\n"); if (chkNews.Checked != true) { myContent.Append("Subscribed to newsletter: No"); } else { myContent.Append("Subscribed to newsletter: Yes"); } myContent.Append("\r\n"); myMail.Body = myContent.ToString(); SmtpMail.Send(myMail); pnlEnquiry.Visible = false; pnlThanks.Visible = true; }

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  • Validate MVC 2 form using Data annotations and Linq-to-SQL, before the model binder kicks in (with D

    - by Stefanvds
    I'm using linq to SQL and MVC2 with data annotations and I'm having some problems on validation of some types. For example: [DisplayName("Geplande sessies")] [PositiefGeheelGetal(ErrorMessage = "Ongeldige ingave. Positief geheel getal verwacht")] public string Proj_GeplandeSessies { get; set; } This is an integer, and I'm validating to get a positive number from the form. public class PositiefGeheelGetalAttribute : RegularExpressionAttribute { public PositiefGeheelGetalAttribute() : base(@"\d{1,7}") { } } Now the problem is that when I write text in the input, I don't get to see THIS error, but I get the errormessage from the modelbinder saying "The value 'Tomorrow' is not valid for Geplande sessies." The code in the controller: [HttpPost] public ActionResult Create(Projecten p) { if (ModelState.IsValid) { _db.Projectens.InsertOnSubmit(p); _db.SubmitChanges(); return RedirectToAction("Index"); } else { SelectList s = new SelectList(_db.Verbonds, "Verb_ID", "Verb_Naam"); ViewData["Verbonden"] = s; } return View(); } What I want is being able to run the Data Annotations before the Model binder, but that sounds pretty much impossible. What I really want is that my self-written error messages show up on the screen. I have the same problem with a DateTime, which i want the users to write in the specific form 'dd/MM/yyyy' and i have a regex for that. but again, by the time the data-annotations do their job, all i get is a DateTime Object, and not the original string. So if the input is not a date, the regex does not even run, cos the data annotations just get a null, cos the model binder couldn't make it to a DateTime. Does anyone have an idea how to make this work?

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