C# custom validation ValidationAttribute

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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