ThirdPartyAPI/Common/Utility/CustomModelValidaton.cs

using Common.Models.ModelValidation;
using Common.Models.RequestResponse;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;

namespace Common.Utility
{
    public class CustomModelValidaton
    {
        public TPResponse IsModelValid<T>(T model) where T : class
        {
            var jm = new ValidationContext(model, serviceProvider: null, items: null);
            var results = new List<ValidationResult>();
            bool IsValid = Validator.TryValidateObject(model, jm, results);
            if (!IsValid)
            {
                var errorList = results.Select(x => new FieldsValidation()
                {
                    Name = x.MemberNames.First(),
                    Message = x.ErrorMessage
                }).ToList();
                TPResponse tPResponse = new TPResponse()
                {
                    ResponseCode = "104",
                    Msg = "Model Validation Failed !",
                    Data = errorList
                };
                return tPResponse;
            }
            return null;
        }
    }
}