Popup Page and redirect to open page and pass values using javascript and Codebehind

  Source:

  <asp:Button ID="btngroup" runat="server"
                                         OnClientClick="window.open ('search.aspx', 'popupwindow','height=400, width=600,top=200,left=200 status=no, resizable=no, scrollbars=no, toolbar=no,location=no, menubar=no');return false;" />
                            

Javascript:

function popup()
{
 window.open ('search.aspx', 'popupwindow','height=400, width=600,top=200,left=200 status=no, resizable=no, scrollbars=no, toolbar=no,location=no, menubar=no');return false;

} 


Codebehind:

ClientScript.RegisterClientScriptBlock(GetType(), "myScript", "<script>window.open ('search.aspx', 'popupwindow','height=400, width=600,top=200,left=200 status=no, resizable=no, scrollbars=no, toolbar=no,location=no, menubar=no');return false;</script>");

Pass values:

    Page.ClientScript.RegisterClientScriptBlock(GetType(), "myScript", "<script>window.opener.document.getElementById('<%= TextBox1.ClientID %>').value = '" Ur Parameter value "';window.close();</script>");