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ASP.NET MVC: Custom Validation by Data Annotation

Your model should implement an interface IValidatableObject. Put your validation code in Validate method.

public class MyModel : IValidatableObject
{
    public string Title { get; set; }
    public string Description { get; set; }

     public IEnumerable Validate(ValidationContext validationContext)
    {
        if (Title == null)
            yield return new ValidationResult("*", new [] { nameof(Title) });

         if (Description == null)
            yield return new ValidationResult("*", new [] { nameof(Description) });
    }
}
This is a server-side validation. It doesn't work on client-side. You validation will be performed only after form submission.

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