If you are a ASP.NET programmer, You'll often encounter a problem, Have the input controls (TextBox) set the maximum length? And Have to give validation controls?
In the Visual Studio development environment, you must click by click in each controls.
Look at this picture:
I write a Visual Studio Package Tool Window, Call: WebFormTools. It can verify that the controls will be displayed, and validation controls associated with his tree.
With this you can quickly check whether there are any errors or not completed part.