ASP.net Custom Validation

ASP.net validation control , such as RequiredFieldValidator , RangeValidator and CompareValidator , is very useful.

But , there will be a day that we need to write a javascript function and used it as CustomValidation.

This is an example of CustomValidation that validate the value entered in a textbox.

The script will need 2 parameters , which will be supplied by CustomValidator control

function CustomValidation(ValidateResult,ObjectToValidate) {
    if (ObjectToValidate.Value >= 1 && ObjectToValidate.Value <= 10) {
        ObjectToValidate.IsValid = true;
    }
    else {
        ValidateResult.innerText = "Please enter value in range of 1-10 only";
        ObjectToValidate.IsValid = false;
    }
} 

Add a CustomValidator , point ControlToValidate to a textbox and set ClientValidationFunction as "CustomValidation"