How to close a window on click event using c#?

Hello Experts.

I have a button on a web form that I would like to close the window when clicked.  I am using VS2012 and c#.

I am attempting to use the following:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace case
{
    public partial class frm1_new_case : System.Web.UI.Page
    {        protected void Page_Load(object sender, EventArgs e)
        {
        }
        private void btn_close_Click(object sender, EventArgs e)
        {          
              this.Close();
        }        
    }
}

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Unfortunately I keep getting the following error:

'case.frm1' does not contain a definition for 'Close' and no extension method 'Close' accepting a first argument of type 'case.frm1' could be found (are you missing a using directive or an assembly reference?)

Am I missing a using directive?

Any help would be greatly appreciated.
ferguson_jeraldAsked:
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AndyAinscowFreelance programmer / ConsultantCommented:
Is this what you want?
this.Form.Close();
Lokesh B RDeveloperCommented:
Hi,

Only in Windows Forms you have the CLOSE() method.

In web application you cannot close the web page. Instead you can redirect to the new Page or create a POP UP using jQuery/Javascript/ModalPopExtender using AJAX.

Response.Redirect("NewPage.aspx");

or

Response.Redirect("http://www.google.com");

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ferguson_jeraldAuthor Commented:
Thanks Andy, but that doesn't work.  Lokesh, the Response.Redirect didn't accomplish what I needed either.  However, I was able to find the answer on another site.  The following does exactly what I needed:

String x = "<script type='text/javascript'>window.opener.location.href='**Your new url of new page after completing test**';self.close();</script>";
ScriptManager.RegisterClientScriptBlock(this.Page,this.Page.GetType(), "script", x,false);

Thanks,
J

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AndyAinscowFreelance programmer / ConsultantCommented:
Thanks, but as my suggestion didn't work I've asked all the points should go to the other expert.
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