How to validate numeric data in a text box using asp.net

<asp:TextBox ID=”TextBox1″ runat=”server”></asp:TextBox> <asp:RegularExpressionValidator ID=”RegularExpressionValidator1″ runat=”server” ControlToValidate=”TextBox1″ ErrorMessage=”Enter only Numbers” ValidationExpression=”[0-9]*”></asp:RegularExpressionValidator>

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