script type = "text/javascript">
function isNumeric(keyCode)
{
return ((keyCode >= 48 keyCode = 57) || keyCode == 8)
}
/script>
script type = "text/javascript">
function isAlpha(keyCode)
{
return ((keyCode >= 65 keyCode = 90) || keyCode == 8)
}
/script>
script type = "text/javascript">
function isAlphaOrNumeric(keyCode)
{
return ((keyCode >= 48 keyCode = 57) || (keyCode >= 65 keyCode = 90) || keyCode == 8)
}
/script>

asp:TextBox ID="TextBox1" runat="server" onkeydown = "return isAlphaOrNumeric(event.keyCode);" onpaste = "return false;">/asp:TextBox>