C#禁止重复提交

C#禁止重复提交 1:连续2次提交     Button1.Attributes.Add("onclick",   "this.value='正在提交中，请等待……';this.disabled=true;"   +   this.GetPostBackEventReference(Button1)); 2:刷新提交：      Response.Write(" <script   language=javascript> alert( '采购成功 ');window.location.href=window.location.href; </script> "); 也可以做成自定义控件：    /**//// <summary>     /// 只能提交一次的按钮     /// </summary>     public class ButtonSubmitOnce : Button     {         private string _textonclick = "处理中，请稍后。。。";         private string _clientcheck;           protected override void Render(HtmlTextWriter writer)         {             StringBuilder temp = new StringBuilder();               temp.Append(this.OnClientClick);               if (!string.IsNullOrEmpty(_clientcheck)) temp.Append("if(!").Append(_clientcheck).Append(") return false;");               if (!string.IsNullOrEmpty(_textonclick)) temp.Append("this.value=\"").Append(_textonclick).Append("\";");               //this is for the ff             temp.Append("if(null==window.onunload) window.onunload = function(){};");               temp.Append("this.disabled = true;").Append(Page.GetPostBackEventReference(this));               this.OnClientClick = temp.ToString();               base.Render(writer);         }           public string TextOnClick         {             set { _textonclick = value; }         }           public string ClientCheck         {             set { _clientcheck = value; }         }     }