防止二次提交 UseSubmitBehavior

UseSubmitBehavior决定其生成的html type是submit还是button，如下：

<input type="submit" name="Button1" value="Button" onclick="alert('ddd');" id="Button1" />
（UseSubmitBehavior=true 默认为true）

<input type="button" name="Button1" value="Button" onclick="alert('ddd');__doPostBack('Button1','')" id="Button1" />（UseSubmitBehavior=false）

<asp:Button ID="Button1" runat="server" UseSubmitBehavior="false" OnClick="Button1_Click"  Text="Button" OnClientClick="if(!validate())return false;this.disabled=true;"  />

或者

<asp:Button ID="Button1" runat="server" UseSubmitBehavior="false" OnClick="Button1_Click"  Text="Button" OnClientClick="DisableButton(this)" />">

<script>
function DisableButton(b) {
b.disabled = true;
b.value = 'Submitting';
}
</script>