Check out example codes for "Response.Redirect cannot be called in a Page callback". It will help you in understanding the concepts better.

Code Example 1

// Butchered together from multiple answers

if (!Page.IsCallback)
    Request.Redirect("~/Error.aspx");
else
  HttpContext.Current.Response.RedirectLocation =
  			System.Web.VirtualPathUtility.ToAbsolute("~/Error.aspx");

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