How to enforce Minimum character length Validation or how to allow Minimum of 4 letters?

 Posted by vishalneeraj-24503 on 7/8/2014 | Category: ASP.NET Interview questions | Views: 1560 | Points: 40

We will use 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]{4,}$" runat = "server" ErrorMessage = "Minimum of 4 letters allowed only"></asp:RegularExpressionValidator>

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