Using the ValidationAttribute we can handle custom validation. It is available in namespace: System.ComponentModel.DataAnnotations Below is snippet for the same here age is being evaluated.
public class AgeValidator : ValidationAttribute
{
public int Age { get; set; }
public override bool IsValid(object value)
{
DateTime dob;
if (value != null
&& DateTime.TryParse(value.ToString(), out dob))
{
if (dob.AddYears(Age) <= DateTime.Now)
{
return true;
}
}
return false;
}
}
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