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<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="FileUpload1"
ErrorMessage="" Display="Dynamic" ValidationExpression="^([a-zA-Z].*|[0-9].*)\.(jpg|JPG)$"
meta:resourcekey="RegularExpressionValidator1Resource1"></asp:RegularExpressionValidator>
<form action="" method="post" enctype="multipart/form-data" name="form1">