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Why this code allows user do not enter any text? AFAIK + means One or more .
<asp:TextBox ID="myTextBox" runat="server" MaxLength="9" />
<asp:RegularExpressionValidator runat="server"
ControlToValidate="myTextBox"
ValidationExpression="\d+"
ErrorMessage="Error!" />
I want user was able to enter only 9 digits. And this field is required. How can I do that?
The regex validators only work when text is entered by default. I would recommend putting in a separate RequiredFieldValidator so you can have a more helpful error message.
Now your ValidationExpression should be
\d{9}.