REGEX to validate the Date (mm/dd/yyyy) - C#

 The format for Date is: mm/dd/yyyy .


<asp:TextBox ID="txtdate" runat="server"></asp:TextBox>


  <asp:RegularExpressionValidator ID="rdate" runat="server" Display="None" ErrorMessage="Enter Valid Date"
ValidationExpression="^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d$" 
ValidationGroup="headlink" 
ControlToValidate="txtdate">
</asp:RegularExpressionValidator>