防止多次提交的方法

a.aspx

   <title>无标题页</title>
    <style type="text/css">
    .disable
     {
         border-style:none;
         border- thin;
         background-color:Transparent;
        color: #CCCCCC;
        cursor:wait;
    }
    </style>

        //return true;

    }
    document.onkeydown=mykeydown;
    function   mykeydown()
    {
        if(event.keyCode==116) //屏蔽F5刷新键
        {
            window.event.keyCode=0;
            return   false;
        }
    }
    </script>

</head>
<body>
    <form id="form1" runat="server">
     <div id="doing"   style="Z-INDEX: 12000; visibility:hidden; LEFT: 0px; WIDTH: 100%; CURSOR: wait; POSITION: absolute; TOP: 0px; HEIGHT: 100%">
            <table style="100%; height:100%;">
                <tr align="center" valign="middle">
                    <td>
                        <table width="169" height="62" bgcolor="#99cccc" style="FILTER: Alpha(Opacity=75); WIDTH: 169px; HEIGHT: 62px">
                            <tr align="center" valign="middle">
                                <td>页面提交中.<br/>
                                    Loading.</td>
                            </tr>
                        </table>
                        </td>
                </tr>
            </table>
        </div>
    <div>
        <div>
            输入一些内容<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
            <asp:ListBox ID="ListBox1" runat="server" Height="77px" Width="332px"></asp:ListBox><br />
            <asp:Button ID="Button2" runat="server" Text="OK" Width="77px" OnClick="Button2_Click" OnClientClick="return DisableButton();" />
            <asp:Button ID="btnSumbit" runat="server" UseSubmitBehavior="false" OnClientClick="this.value='Sumbit';this.disabled=true; " Text="Sumbit" OnClick="btnSumbit_Click" />
            <asp:Button ID="Button1" runat="server" Text="Loading" OnClick="Button1_Click1" />
        </div>

</div>
</form>
</body>
</html>

a.aspx.cs

public partial class WebForm1 : System.Web.UI.Page
    {
        static public int count = 0;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
               // Button2.Attributes.Add("onclick", "return DisableButton();");
                this.Button1.Attributes.Add("onclick", "javascript:document.getElementById('doing').style.visibility='visible';");
            }

        }
        //override protected void OnPreRender(EventArgs e)
        //{
        //    doing.Style.Add("visibility", "hidden");
        //}
        //override protected void OnPreRenderComplete(EventArgs e)
        //{
        //    doing.Style.Add("visibility", "hidden");
        //}

        protected void Button2_Click(object sender, EventArgs e)
        {
            System.Threading.Thread.Sleep(3000);
            count++;
            ListBox1.Items.Add(new ListItem("Hello "+TextBox1.Text + " 这是你第" + count.ToString() + "次点击   " + DateTime.Now.ToString()));
            TextBox1.Text = "";
        }

        protected void btnSumbit_Click(object sender, EventArgs e)
        {
            System.Threading.Thread.Sleep(3000);
            count++;
            ListBox1.Items.Add(new ListItem("Hello " + TextBox1.Text + " 这是你第" + count.ToString() + "次点击   " + DateTime.Now.ToString()));
            TextBox1.Text = "";
        }

        protected void Button1_Click1(object sender, EventArgs e)
        {
           // doing.Style.Add("visibility", "show");
            System.Threading.Thread.Sleep(3000);
        }
    }