...

Shared/DTOs/_TaxPayer.cs

@@ -20,7 +20,7 @@ namespace Shared.DTOs
             public int ID { get; set; }
             public List<Fild> filds { get; set; }
         }
-        public class Fild
+        public class Fild:ICloneable
         {
             public int FildID { get; set; }
             public string fName { get; set; }
@@ -32,6 +32,11 @@ namespace Shared.DTOs
             public List<Coding> DefVals { get; set; }
             public string? Value { get; set; }
             public string[]? Des { get; set; }
+
+            public object Clone()
+            {
+                return this.MemberwiseClone();
+            }
         }
         public class Coding
         {