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Question: How to Remove DATA tab for End users?

Answer:

Add the "EnvironmentSettings" control to your form. 
Then add the following line before calling report.Design():

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EnvironmentSettings1.DesignerSettings.Restrictions.DontCreateData = True;
EnvironmentSettings1.DesignerSettings.Restrictions.DontEditData = True;

 If you use DesignerControl then should use this:

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designerControl1.Restrictions.DontCreateData = true;
designerControl1.Restrictions.DontEditData = true;

this way the data controls will be disabled.