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September 05, 2008
what is databinding?
Posted Date: September 05, 2008 Points: 5
Hope it is understanding..
Posted Date: October 16, 2010 Points: 5
The ASP.NET data binding mechanism works only in one way: When you add a databinding to an ASP.NET WebForm in design time, Visual Studio .NET adds a databinding expression to the ASPX file (<%# %><%# ... %> ). When the WebForm is requested for the first time, the ASPX file is parsed, JIT compiled and executed. For each data binding expression in a control, a handler is added to its DataBinding event. The DataBinding event is fired when the control's DataBind method is called, and the handlers added by the ASP runtime evaluates the data binding expression and performs the actual data binding. So far, so good.
At runtime we can only rely on ASP.NET to do one way data binding. If we only want to display information this works fine, but if we need to get data from a form, we have to get the values from the controls ourselves, which is a non-orthogonal mechanism and a tedious task.
If we were able to get the data bindings at run time, we could use reflection to perform 2 way databinding. However there is no way to get the data bindings at runtime. Of course, we can add properties in our controls to store the data bindings in order to fix that problem but i don't like that idea.
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