We can validate textbox with only numbers by writing this Javascript code and calling at onkeypress event of text box

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

         return true;
      }
      //–>

   <asp:TextBox ID=”txt_maxage” Onkeypress=”return isNumberKey(event)” runat=”server”></asp:TextBox>

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