asp.net code not working validation -


i can't figure out wrong in code. new asp.net.

<body> <form id="form1" runat="server"> <div> <asp:textbox id="txt" runat="server" /> <asp:regularexpressionvalidator id="regularexpressionvalidator1" runat="server" errormessage="regularexpressionvalidator" validationexpression="^\d{4}$"></asp:regularexpressionvalidator> </div> </form> </body>

you missing control validate property. set controltovalidate ="txt". 

 <asp:regularexpressionvalidator id="regularexpressionvalidator1" runat="server" errormessage="regularexpressionvalidator" controltovalidate ="txt" validationexpression="^\d{4}$"></asp:regularexpressionvalidator>

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