Difference between Masterpage and Usercontrol vs Customcontrol

Question

please help me understand the difference between the main page and user control versus user control

Answer 1

Check the answer to a similar question:

ASP.Net User Controls and User Controls: These Are Two Alike

Main pages are user controls; you can verify this by going to the code of your class on the main page, right-click the class name and select "Go to Definition". You will see something like this:

public class MasterPage : UserControl
{
    ...
}

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Microsoft:

http://support.microsoft.com/kb/893667