Decimal Validation in asp.net C# :-

   <asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ErrorMessage="Plz Enter Only Decimal"
                        ControlToValidate="txtMRP" ValidationExpression="^-?[0-9]{0,5}(\.[0-9]{1,2})?$|^-?(100000)(\.[0]{1,5})?$"></asp:RegularExpressionValidator>


{0,5} - Indicate no.of digit to be allowed, so customized as per requirement.

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