GridView Hidden Column Problem (And Two Common Solutions)
Explains how to simulate hidden column in GridView control. GridView is one of the new controls in ASP.Net 2.0 that replaced the DataGrid. In earlier versions of .Net when you didn't want the data to be visible to the client, you simply set the Column visibility to False. But, if you try that with ASP.NET 2.0 GridView control, it will return only empty string.