This article describes the life cycle of an ASP.NET page from initialization to unloading. Also shows the various methods to override ASP.NET server-side events. Source code available for download.
Tutorial Details:
ASP.NET .NET The ASP.NET Page Life Cycle Tutorial
When a page request is sent to the Web server, whether through a submission or location change, the page is run through a series of events during its creation and disposal. When we try to build ASP.NET pages and this execution cycle is not taken into account, we can cause a lot of headaches for ourselves. However, when used and manipulated correctly, a page's execution cycle can be an effective and powerful tool. Many developers are realizing that understanding what happens and when it happens is crucial to effectively writing ASP.NET pages or user controls.
1. Object Initialization
A page's controls (and the page itself) are first initialized in their raw form. By declaring your objects within the constructor of your C# code-behind file the page knows what types of objects and how many to create. Once you have declared your objects within your constructor, you may then access them from any sub class, method, event, or property. However, if any of your objects are controls specified within your ASPX file, at this point the controls have no attributes or properties.
2. Load Viewstate Data
After the Init event, controls can be referenced using their IDs only (no DOM is established yet for relative references). At LoadViewState event, the initialized controls receive their first properties: viewstate information that was persisted back to the server on the last submission. The page viewstate is managed by ASP.NET and is used to persist information over a page roundtrip to the server. Viewstate information is saved as a string of name/value pairs and contains information such as control text or value. As you can see, this is a giant leap forward from the old ASP 3.0 techniques of maintaining state.
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