Asp.NET Tips

When do we need asynchronous page in ASP.net. Suppose you have a website with two web pages. One is your home page which display's a greeting, and the second page displays a large dataset from a database. You have 25 threads in your thread pool. 25 people simultaneously are accessing the database query page, and one additional person comes onto the site to see the home page which has static content on it. http://davidjberman.com/blogs/csharp/archive/2007/08/13/how-to-create-asynchronous-asp-net-pages-using-c.aspx

There are some ways to send number of parameters to the new created thread. 1. Creating a new instance of a class, and using that instance to store the information 2. Using ThreadPool to send parameters 3. Calling a delegate asynchronously More detailed information can be found at: http://www.yoda.arachsys.com/csharp/threadstart.html

Following link contains roadmap for following products: ASP.NET 3.5 Silverlight 2.0 IIS7 http://weblogs.asp.net/scottgu/archive/2007/11/29/net-web-product-roadmap-asp-net-silverlight-iis7.aspx

Here is code that should reverse Linked list: Linked list class: class Node { int ID; string name; Node next; } First option (recursive function): Node Reverse(Node root) { PutOnTop(root, root.Next) } Node PutOnTop(Node newRoot, Node current) { Node next = current.Next; current.Next = newRoot; if(next.Next!=null) PutOnTop(current,next); } Second option (without using recursive function): Node Reverse(Node root) { Node current = root.next; Node prev = root; while(current!=null) { Node next = current.Next; current.Next = prev; prev = current; current = next; } }

During my first investigation of Dynamic Data Support at .NET 3.5 environment, I've found that even Microsoft has bug :-))) After the following great instructions of following screen-cast I've finished in few minutes with applications that allows me to maintain all my database tables. The problem is that already at third screen I've played with I got following error message: 'DropDownList1' has a SelectedValue which is invalid because it does not exist in the list of items. Fortunately, I'm not the first who is plying with Dynamic Data at .NET 3.5 so at this blog you can find fix and good explanation of this bug.

ASP.NET web application allows us to you implement IHttpModule interface to catch all unhandled exception. Similar way we can catch all unhandled exceptions in winforms applications by handling AppDomain.CurrentDomain.UnhandledException event. The main idea is to do something like this: static void Main( string [] args) { AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException); } In the implementation of the CurrentDomain_UnhandledException method, we can write to the log, close some open handles and most important - show a pleasant message to the user. static void CurrentDomain_UnhandledException( object sender, UnhandledExceptionEventArgs e) { try { // Write to the log, close handels, … // Show message box. } finally { Application.Exit(); } } code source

There many discussions about how to build folder structure of you developer machine. The main question id where to store common libraries and all your projects structure? Following article gives great example of Solution Structure .

From some reason it wasn't so easy to find comparison of SQL Server 2005 editions. So here is a link. There is also good article about SSIS in different SQL Server 2005 Editions