文本框中输入小写字母即时转换为大写实现思路

<asp:TextBox ID="TextBoxSeriesNumber" runat="server"></asp:TextBox>

<script type="text/javascript">
window.onload = function () {
var textBox = document.getElementById("<%= TextBoxSeriesNumber.ClientID %>");

textBox.onkeyup = function () {
this.value = this.value.toUpperCase();
};
};
</script>