Javascript error on page reload using response.redirect in asp.net

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C#

ASP.NET

I have a button on my page which I use to redirect the user to the same page.

protected void Undo123_Click(object sender, EventArgs e)
       {
           Page.Response.Redirect(Page.Request.Url.ToString(), true);
       }

I get this error:

Microsoft JScript runtime error:
Sys.WebForms.PageRequestManagetServerErrorException: An unknown error occurred while processing the request on the server.The status code returned from the server was 500

I got this error on every button click the day before, but when I closed the solution and opened it again, it was gone. Closing the solution does not work now.
May I know the reason behind this error and how do I resolve that in my case.

Thank you !