Validation Controls in ASP.NET

Validation Controls

 ü  Common property for all validation controls is

a.    ErrorMessage

b.   ControlToValidate

 ü  We can alse set validation group for validation controls

          Eg: -checkavailabilty button only for username text box.

We can set validation group for that button and validation control for that text box.

1.RequiredFieldValidator

a.InitialValue  (eg :-  “—select—“ for dropdownlist)

2.   RegularExpressionValidator

a.      ValidationExpression ( for email,length of password etc…)

Eg: ([A-Za-z0-9]{8,15}) – for password strength.

    Or ---  ^([A-Za-z0-9]{8,15})$

3.   CompareValidator

a.      ControlToValidate

b.      Control to Compare

4.   RangeValidator

a.      Minimum value

b.      Maximum value

c.       Type ( eg: for age between 20-30 – type –integer)

5.   ValidationSummary

a.      To show summary in separate section;

6.   CustomValidator  (takes values from server )

a.      Control to validate

b.      Error Message

c.       Write Code on CustomValidator Click

Example : - for SalaryField ( between 5000-8000)

protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)

    {

        try

        {

            int val = Convert.ToInt32(args.Value);

            if (val>=5000 && val <=8000)

            {

                args.IsValid = true;

            }

            else

            {

                args.IsValid = false;

            }

        }

        catch

        {

            args.IsValid = false;

        }

}