What Peter is saying is that the error you are getting does not match this code:
Line 18: String username = Page.User.Identity.Name;
Line 19: username =username.Replace("GAR\\","");
Line 20: Label2.Text = username;
Line 21:
Line 22: Label2.Text = username.ToUpper();
Calling Replace() will not cause this type of error to be thrown. I most commonly see this error when working with SubString() trying to refer to a position in the string that doesn't exist.
hth.
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