string url = String.Format("{0}://{1}/{2}", Request.Url.Scheme, Request.Url.Authority, "Default.aspx"); Response.Clear(); var sb = new System.Text.StringBuilder(); sb.Append("<html>"); sb.AppendFormat("<body onload='document.forms[0].submit()'>"); sb.AppendFormat("<form action='{0}' method='post'>", url); sb.AppendFormat("<input type='hidden' name='id' value='{0}'>", id); sb.AppendFormat("<input type='hidden' name='year' value='{0}'>", year); sb.AppendFormat("<input type='hidden' name='mid' value='{0}'>", mid); sb.Append("</form>"); sb.Append("</body>"); sb.Append("</html>"); Response.Write(sb.ToString()); Response.End();