How to enforce Maximum character length Validation or how to allow maximum of 5 letters?

Answer:

We will use Asp.net RegularExpressionValidator control to achieve this task:-

Refer below code:-

<asp:TextBox Id = "txt_employee_code" runat = "server"></asp:TextBox>



<asp:RegularExpressionValidator Display = "Dynamic" ControlToValidate = "txt_employee_code" Id = "reg_ex_employee_code" ValidationExpression = "^[\s\S]{0,5}$" runat = "server" ErrorMessage = "Maximum of 5 letters allowed"></asp:RegularExpressionValidator>

It will allow only 5 letters after that it will give error mmessage as Maximum of 5 letters allowed