如下TextBox

復制代碼 代碼如下:

<asp:textboxonkeypress="isnum()"id="TextBox1"runat="server"></asp:textbox>

1. 在頁面中添加一段腳本：

復制代碼 代碼如下:

<scriptlanguage="javascript">
functionisnum()
{
if(event.keyCode<45||event.keyCode>57)
{
event.keyCode=0;
}
}
</script>

復制代碼 代碼如下:

try
{
Convert.ToDouble(TextBox1.Text.Trim());
}
catch
{
Response.Write(" ");
TextBox1.Text="";
Page.RegisterStartupScript("focus"," ");
}