TextBox with numeric input only : textbox, only, numeric, input

function ISonlynumber(evt)
{
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode > 31 && (charCode < 48 || charCode > 57))
return false;
return true;
}

<asp:TextBox ID="txtmobileNO" Runat="server" Width="150" MaxLength="64" onkeypress="javascript:return ISonlynumber(event);"></asp:TextBox>

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