jQuery Forum

I am calling jquery UI dialog, and opening a new .aspx page inside it:

        protected void Button1_Click(object sender, EventArgs e)
        {
            string strURL = "http://localhost:3907/JQueryUI/PopupASPXPageTestingJQueryUI.aspx";
            string script = "<script language=\"JavaScript\"> "+
            "var url = '"+ strURL +"'; " +
            "var mydialog = $(' <div id=\"mydiv\" align=\"left\" style=\"width: 600px; height: 800px; padding: 0px 0px 0px 0px; margin: 0px 0px 0px 0px;\"> <iframe id=\"myframe\" src=\"' + url + '\" frameborder=\"0\" width=\"100%\" height=\"100%\"></iframe> </div> ').appendTo('body'); " +

            "mydialog.dialog({ resizable: false, draggable: false, height: 800, width: 600, zIndex: 3999 , closeOnEscape:false, modal: true, open: function (type, data) { $(this).parent().appendTo(\"form\"); }    }); " +
            "</script>";
            Page.RegisterStartupScript("tempscript",script);
        }

Now, I want to close this dialog, from a button click on code behind of the .aspx page opened in this dialog.

For Example,

        protected void btn1_Click(object sender, EventArgs e)
        {

            string script = "<script language=\"JavaScript\"> " +
                    "$(mydialog).dialog('close');" +
                    "</script>";
            Page.RegisterStartupScript("tempscript12", script);
        }

But, it is not working. I have tried several other ways, but none is working. Please, help me.