To avoid duplicate telephone number entries to the database, the following Custom Validation Attribute has been designed, but for some reason, the calling class cannot read the Repository.

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false, Inherited = false)]
sealed public class TelephoneAttribute : ValidationAttribute
{
    private readonly IJobRepository _jobRepository; 
    public TelephoneAttribute(IJobRepository jobRepository) 
    {
        _jobRepository = jobRepository;
    }
    public override bool IsValid(object value)
    {
        bool result = false;
        // my logic to avoid duplication of telephone
        var anyDuplicate = _jobRepository.AllJobs.GroupBy(x => x.CustomerContactNumber)
            .Any(g => g.Count() > 1);
        if (anyDuplicate) { result = true; }
        return result;
    }
}

While trying to use this custom attribute in a Model class like:

[Required(ErrorMessage = "**Required**")]
[Display(Name = "Customer Contact Number")]
[DataType(DataType.PhoneNumber)]
[TelephoneAttribute(ErrorMessage = "Duplicate Entry")]

public string CustomerContactNumber { get; set; }

On [TelephoneAttribute(ErrorMessage = "Duplicate Entry")] line of code, I'm receiving following error:

CS7036: There is no argument given that corresponds to the required parameter 'jobRepository' of 'TelephoneAttribute.TelephoneAttribute(IJobRepository)'

Please guide. Thanks