继承Button防止表单的重复提交！

源码：

using System;
using System.Web.UI.WebControls;

namespace HMG.WebControls
{
    /**//// <summary>
    /// 提交成功后执行关闭还是重定位到本页面
    /// </summary>
    public enum SubmitStyle
    {
        /**//// <summary>
        /// 重定位
        /// </summary>
        Redirect,
        /**//// <summary>
        /// 关闭
        /// </summary>
        Close
    }
    
    /**//// <summary>
    /// SubmitOnceButton 的摘要说明。
    /// </summary>
    public class SubmitOnceButton:System.Web.UI.WebControls.Button
    {
        /**//// <summary>
        /// 默认的构造函数，当没有构造函数的时候不会执行
        /// </summary>
        public SubmitOnceButton():base()
        {
        }
    
        /**//// <summary>
        /// 执行成功后重定位的Url
        /// </summary>
        public string Url
        {
            get
            {
                if(ViewState["url"]==null)
                {
                    ViewState["url"]=string.Empty;
                }
                return ViewState["url"].ToString();
            }
            set
            {
                ViewState["url"]=value;
            }
        }
        /**//// <summary>
        /// 执行时候显示的临时文本
        /// </summary>
        public string TempText
        {
            get
            {
                if(ViewState["temptext"]==null)
                {
                    ViewState["temptext"]="请稍候";
                }
                return ViewState["temptext"].ToString();
            }
            set
            {
                ViewState["temptext"]=value;
            }
        }
        /**//// <summary>
        /// 执行成功后关闭本页面还是重定位 使用的样式
        /// </summary>
        private SubmitStyle hint=SubmitStyle.Redirect;
        /**//// <summary>
        /// 执行成功后关闭本页面还是重定位
        /// </summary>
        public SubmitStyle SubmitSuccessStyle
        {
            get
            {
                return this.hint;
            }
            set
            {
                this.hint=value;
            }

        }
        private string GetScriptBlock()
        {
            const string FormatStr="javascript:this.value='{0}';setTimeout(function Test(){{this.disabled=true;}},0);";
            string temp=string.Empty;
            return string.Format(FormatStr,new object[]{this.TempText})+temp;
        }
        /**//// <summary>
        /// 执行成功后重新定位
        /// </summary>
        /// <param name="msg">成功后的提示信息</param>
        public void SubmitSuccess(string msg)
        {
            if(this.Url==string.Empty)
            {
                this.Url=this.Page.Request.UrlReferrer.ToString();
            }
            if(this.SubmitSuccessStyle==SubmitStyle.Redirect)
            {
                this.Page.RegisterStartupScript(this.ClientID,"<script>alert('"+msg+"');window.location.href='"+this.Url+"';history.go(1);</script>");
            }
            else
            {
                this.Page.RegisterStartupScript(this.ClientID,"<script>alert('"+msg+"');window.opener=null;window.close();</script>");
            }
            
            
        }
        /**//// <summary>
        /// 给加客户端提示信息
        /// </summary>
        /// <param name="writer">输出流</param>
        protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
        {
            this.Attributes.Add("onclick",this.GetScriptBlock());
            base.AddAttributesToRender (writer);
        }


    }
}

使用时候的单击事件

private void SubmitOnceButton1_Click(object sender, System.EventArgs e)
  {
   System.Threading.Thread.Sleep(500);
   this.TextBox1.Text="username"; 
   System.Diagnostics.Debug.WriteLine("excute submitonce!");
   this.SubmitOnceButton1.SubmitSuccess("提交成功！");//提交成功的时候执行这个方法即可
  
  }