Validate date string in MM/dd/yyyy format using RegularExpressionValidator in ASP.Net

Hi nauna,

Use RegularExpressionValidator.

HTML

<asp:TextBox ID="txtDate" runat="server" />
<asp:RegularExpressionValidator runat="server" ControlToValidate="txtDate"
    ValidationExpression="((0[1-9]|1[0-2])\/((0|1)[0-9]|2[0-9]|3[0-1])\/((19|20)\d\d))$"
    ErrorMessage="Invalid date format." ForeColor="Red" />

Screenshot