Answer: We will write 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]{5,7}$" runat = "server" ErrorMessage =
"Minimum of 5 and Maximum of 7 letters allowed only"></asp:RegularExpressionValidator>
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