Non Visual Controls in Visual Studio Designer

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While working in Visual Studio Designer, Following controls don’t show up on the designer, you can see the HTML for them though. These controls are called Non-Visual Controls. Some of them are: 

SqlDataSource

AccessDataSource

ObjectDataSource

XMLDataSource

SiteMapDataSource

 

In order to view them on the designer surface, you have to check the "Non Visual Controls" property in View Menu of the Visual Studio.