Open popup window using asp.net c#

string popup = "<script language='javascript' ID='script1'>" + "window.open('../frmEmpDetail.aspx?data=" + HttpUtility.UrlEncode(qstr.ToString()) + "','newwindow', 'top=0,left=50,width=900,height=650,dependant = no, alwaysRaised = no, menubar=yes, resizable=no ,scrollbars=yes, toolbar=no,status=no')" + "</script>";
ScriptManager.RegisterStartupScript((Page)HttpContext.Current.Handler, typeof(Page), "script1", popup, false);