// type this part between form tag
4 digit number:<br />
<asp:TextBox runat="server" id="txtNumber" />
<asp:RegularExpressionValidator runat="server" id="rexNumber" controltovalidate="txtNumber" validationexpression="^[0-9]{4}$" errormessage="Please enter a 4 digit number!" />
<br /><br />
4 digit number:<br />
<asp:TextBox runat="server" id="txtNumber" />
<asp:RegularExpressionValidator runat="server" id="rexNumber" controltovalidate="txtNumber" validationexpression="^[0-9]{4}$" errormessage="Please enter a 4 digit number!" />
<br /><br />
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