带有删除提示的BUTTON

.net里面的BUTTON没有一下提示
如删除BUTTON要有一个提示框,当用户点确定会才进行删除
所以到BUTTON进行的扩展
代码如下:

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Text;

namespace WebClass
{
    public class ConfirmButton : System.Web.UI.WebControls.Button
    {

        private string _confirmMessage;

        /// <summary>

        /// 当客户端点击此Button时弹出的提示消息筐的内容

        /// </summary>

        public string ConfirmMessage
        {

            get
            {

                return _confirmMessage;

            }

 

            set
            {

                _confirmMessage = value;

            }

        }

 

        protected override void OnPreRender(System.EventArgs e)
        {

            StringBuilder sb = new StringBuilder();

            sb.Append("<script language=\"JavaScript\">");

            sb.Append(System.Environment.NewLine);

            sb.Append("<!--");

          

            sb.Append(System.Environment.NewLine);

            sb.Append("function _doAspxBoyConfirm()");

            sb.Append(System.Environment.NewLine);

            sb.Append("{");

            sb.Append(System.Environment.NewLine);

            sb.Append("return confirm(\"");

            sb.Append(ConfirmMessage);

            sb.Append("\")");

            sb.Append(System.Environment.NewLine);

            sb.Append("}");

            sb.Append(System.Environment.NewLine);

            sb.Append("//-->");

            sb.Append("</script>");

            Page.RegisterClientScriptBlock("_doAspxBoyConfirm", sb.ToString());

            this.Attributes.Add("onclick", "return _doAspxBoyConfirm()");

            base.OnPreRender(e);

        }

        public override void RenderBeginTag(HtmlTextWriter writer)
        {
            writer.WriteLine();
            base.RenderBeginTag(writer);

        }

        public override void RenderEndTag(HtmlTextWriter writer)
        {
            base.RenderEndTag(writer);
            writer.WriteLine();
            writer.WriteLine();
        }

    }

}