--------------頁面加入js-------------
<script language="javascript" id="clientEventHandlersJS">
function f(){
if(!(window.event.keyCode>=48 && window.event.keyCode<=57)){
window.event.keyCode=0
}
}
</script>
---------在Page_Load時加入----------
TextBox1.Attributes.Add("onkeyup","f()");
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