Validating Integer and float value in asp.net

I took from your question that the validation is to be done on the server side so try it like this:
Depends on what kind of validation you need. First make sure the text you received in said fields is really and integer or a double (don't use floats as they don't have any advantage over doubles). This can be achieved by using double.TryParse(String strVal, out double value) or int.TryParse(String strVal, out int value) methods.
When the conversion was successful you can check for containment in a range or an upper or lower bound etc.

If you have any doubts leave me a comment!

-MRB

You can take a help of Javascript
Here is the way to validate click ME[^]

You have to use CompareValidator like below

<asp:TextBox ID="txt1" runat="server"></asp:TextBox>
<asp:CompareValidator ID="intValidator" runat="server" ControlToValidate="txt1" Operator="DataTypeCheck" Type="Double" ErrorMessage="Value must be a integer or float" />

OR

You can use RegularExpressionValidator and write the regular expression to validate number and float values.

OR

You can use CustomValidator and write your own Javascript to validate number and float values

This should solve your problem.