Validation for Cellnumber and Email

UnivateProperties_API/Context/DataContext.cs

                 b.HasKey(e => e.Id);
                 b.Property(e => e.Id).ValueGeneratedOnAdd();
             });
+            modelBuilder.Entity<Individual>()
+            .HasIndex(i => new { i.Telephone, i.CellNumber, i.Email })
+            .IsUnique(true);
             modelBuilder.Entity<Agent>(b =>
             {
                 b.HasKey(e => e.Id);
                 b.HasKey(e => e.Id);
                 b.Property(e => e.Id).ValueGeneratedOnAdd();
             });
+            modelBuilder.Entity<User>()
+            .HasIndex(u => u.Username)
+            .IsUnique(true);
             modelBuilder.Entity<Email>().HasQueryFilter(m => EF.Property<bool>(m, "IsDeleted") == false);
             modelBuilder.Entity<SMTPAccount>().HasQueryFilter(m => EF.Property<bool>(m, "IsDeleted") == false);
             modelBuilder.Entity<SMTPHost>().HasQueryFilter(m => EF.Property<bool>(m, "IsDeleted") == false);
             modelBuilder.Entity<Address>().HasQueryFilter(m => EF.Property<bool>(m, "IsDeleted") == false);
             modelBuilder.Entity<BidItem>().HasQueryFilter(m => EF.Property<bool>(m, "IsDeleted") == false);
             modelBuilder.Entity<ProcessFlow>().HasQueryFilter(m => EF.Property<bool>(m, "IsDeleted") == false);
-
         }
     }
 }

UnivateProperties_API/Model/Users/Person.cs

         public int? UserId { get; set; }
         public string Name { get; set; }
         public string Surname { get; set; }
+        [DataType(DataType.EmailAddress)]
         public string Email { get; set; }
         [Phone]
         public string Telephone { get; set; }