Only Number validation in Textbox of ASP.NET Using Regular Expression validator

Only numbers can enter into that Textbox

We can use Regular expression validator for this:

In the validation expression property keep ^\d+$.

<asp:TextBox ID="TextBox1" runat="server" Style="z-index: 100; left: 259px; position: absolute;top: 283px" ValidationGroup="check"></asp:TextBox>

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="Please Enter Only Numbers" Style="z-index: 101; left: 424px; position: absolute;top: 285px" ValidationExpression="^\d+$"  ValidationGroup="check"></asp:RegularExpressionValidator>

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