public static bool IsIn<T>(this T value, params T[] checkList)

        {

            bool result = false;

            bool emptyList = (checkList == null || checkList.Length <= 0);

            if (emptyList && Equals(value, default(T)))

                result = true;

            else if (!emptyList)

                foreach (T item in checkList)

                    if (value.Equals(item))

                    {

                        result = true;

                        break;

                    }

            return result;

        }

string toSearch = "search";

bool found = toSearch.IsIn("This", "extension", "is", "used", "to", "search", "for", "values");