public static T Parse<T>(this string value)  //where T : IConvertible
      {
          var tt = Type.GetTypeCode(typeof(T));

          var hh = typeof(T).GetMethods();

          MethodInfo TryParseMethod = typeof(T).GetMethod("TryParse", new Type[] { typeof(string), typeof(T).MakeByRefType() });

          hh.Count();

          if (TryParseMethod != null)
          {
              object[] parameters = new object[] { value, null };
              if ((bool)TryParseMethod.Invoke(null, parameters))
                  return (T)parameters[1];
              else
                  return default(T);
          }
          else
              return default(T);
      }

      /*
            Int32 i32 = "123".Parse<Int32>();
            Int64 i64 = "123".Parse<Int64>();
            long l = "123".Parse<long>();
            float f = "123.2".Parse<float>();
            float f2 = "123,2".Parse<float>();
            Int32? ip32 = "null".Parse<Int32?>();
            Int32? ip232 = "null".Parse<Int32>();
            string rr = "null".Parse<string>();

      */