TRULY Understanding ViewState - Infinities Loop. ViewState is a very misunderstood animal. I would like to help put an end to the madness by attempting to explain exactly how the ViewState mechanism works, from beginning to end, and from many different use cases, such as declared controls vs. dynamic controls. There are a lot of great articles out there that try to dispel the myths about ViewState. You might say this is like beating a dead horse (where ViewState is the horse, and the internet is the assailant). But this horse isn't dead, let me tell you.
No, he's very much alive and he's stampeding through your living room. It's not that there's no good information out there about ViewState, it's just all of them seem to be lacking something, and that is contributing to the community's overall confusion about ViewState. "If a control uses ViewState for property data instead of a private field, that property automatically will be persisted across round trips to the client.
" MISUNDERSTANDING OF VIEWSTATE WILL LEAD TO... 1. Get { 2. 3. 4. Beware Of Deploying Debug Code In Production (aspnetresources.com) You have spent several months developing a killer web application (a web site, perhaps) and the long anticipated release day has come. You deploy the application and take it for a test drive. As you navigate from page to page you notice that each page “thinks” before rendering. What’s going on? Didn’t Microsoft folks promise code compilation and ultra fast execution? Take a peek inside your web.config. The compilation element has many attributes. True to have the framework produce debug binariesfalse to produce release (retail) binaries Let's dig in. For example, I created a sample project for this article and named it DebugTest. The sample project, TestDebug, has two pages named test1.aspx and test2.aspx.
Let's expand the tree of folders with cryptic names and locate our assembly. [AssemblyInfo] MVID=69266042ccf63445be7d9c996d9658aa URL= DisplayName=DebugTest, Version=1.0.1584.40802, Culture=neutral, « PublicKeyToken=null Bingo! ASP.NET Resources - ASP.NET Custom Error Pages (aspnetresources.com) ASP.NET provides a simple yet powerful way to deal with errors that occur in your web applications. We will look at several ways to trap errors and display friendly meaningful messages to users. We will then take the discussion a step further and learn how to be instantly notified about problems so you can cope with them right away.
As a geek touch we will also track the path 404's travel. In the days of "classic" ASP you used to get cryptic—an often times downright misleading—error messages. It's obvious that "white pages" are ugly but there's another angle to this—ASP.NET displays an exception stack trace which may reveal what your code does and how it works. Custom error pages are not luxury any more, they are a must-have. Every time you create a web form in Visual Studio .NET you see that your page class derives from System.Web.UI.Page. This works for one page only, you may say. . Later on in this article you will learn why may need to collect exception information in this manner. New Compilation Modes in ASP.NET 2.0 (Rick Strahl's Web Log) The default deployment model in ASP.NET 2.0 is to compile pages in place. In other words if you specify a CodeFile and the CodeFile exists ASP.NET will compile this file on the fly the first time the page is loaded.
This is the default when Visual Studio creates a new projects and adds pages to the project. So you will have an ASPX page and a .cs or .vb source file that is the partial codebehind file that contains your event and page handling code. The other half of the partial class then contains all the control declarations and event hookups. I talked about this in more detail in my post yesterday. The control declarations are generated at compile time not at design time which means they are always in sync – no more issues where a control exists in the ASPX page, but not in the source code. This also has an impact on compile time behavior. This means it’s not possible to separate out just the compiled code from the ASPX page code as was possible in the ASPX 1.1. In place compilation. Web Application Error Handling in ASP.NET (15 Seconds) By Adam Tuliper All applications should have error handling. This we all know. We can't always be notified of an unhandled error (and usually aren't) when one occurs on a client's machine.
The advantage we have on the Web is that we can always be notified when an unhandled error occurs. The Problem Errors will occur in our applications. When an error occurs Where it occurred What the error is Having a central location such as the event log, database or some other log file to log errors is essential for debugging this problem later (I call this forensics debugging). IIS provides great error-handling capabilities. The Solution For such a list of problems, the solution is actually pretty simple. In the web.config file's customErrors section. The actual order of error handling events is as follows: On the Page itself, in the Page_Error sub (this is default, you can name it anything because it specificed Handles MyBase.Error) The global.asax Application_Error sub The web.config file.
Could not load file or assembly App_Web... - ASP.NET Forums. Dynamic Web Controls, Postbacks, and View State (ASP.NET.4GuysFromRolla.com) By Scott Mitchell Introduction As I've written about in two previous articles here on 4Guys - Dynamic Controls in ASP.NET and Working with Dynamically Created Controls - ASP.NET makes it easy to programmatically add Web controls. Armed with this capability, you can offer a truly customized experience for your users. For example, your site might load particular navigational elements as user controls, based upon the logged on user's preferences. Or when collecting information from your users, you might display different input fields prompting for different data based on the user's age, location, gender, and so on. One of the main challenges with working with dynamically added controls is that these controls must be programmatically added on each postback.
In this article we will examine how to add dynamic Web controls to a page in such a manner that you will not need to worry about losing form field values on postback. Understanding the Page Lifecycle Adding Controls at the Right Time. Dynamic Controls in ASP.NET (ASP.NET.4GuysFromRolla.com) Published: Wednesday, August 14, 2002 By Scott Mitchell Introduction If you're reading this article, you've no doubt created an ASP.NET Web page with various Web controls. Typically one creates Web controls statically, by explicitly specifying them in the HTML section of an ASP.NET Web page. For example, one might create an ASP.NET Web page that contains an HTML message and a TextBox, which would contain the following code: The code above specifies two Web controls: A LiteralControl (the "What is your name" HTML gets converted into a LiteralControl when the ASP.NET Web page is requested from a browser for the first time), andA TextBox Web control The above code explicitly specifies the controls that should appear on the ASP.NET Web page (granted, the HTML being converted into a LiteralControl is a bit implicit).
The Page Class When an ASP.NET Web page is first visited by a user it is converted into a class that inherits the Page class. Adding a Dynamic Control to an ASP.NET Web Page.