String contains all chars of a second string

Check if one string contains all chars of a second string (doesn’t have to be in the same order), return the start index and end index.

For example:

Given: S1=”b12avi” S2=”iva”

Then: S1 contains S2, start index is 3, end index is 5

Test:

        [TestMethod]
        public void TestStringContainsAllChars()
        {
            int start;
            int end;
            bool contains = StringContainsAllChars.Check("b12avi", "iva", out start, out end );
            Assert.IsTrue(contains);
            Assert.AreEqual(3, start);
            Assert.AreEqual(5, end);
            
            bool doesntContain = StringContainsAllChars.Check("b12avi", "ll", out start, out end);
            Assert.IsFalse(doesntContain);
        }

Solution: 

        public static bool Check(string containerString, string containedString, out int start, out int end)
        {
            if (containerString.Length < containedString.Length)
            {
                throw new Exception("Invalid input, container string should be bigger than the contained string");
            }

            if (containerString.Length == 0 || containedString.Length == 0)
            {
                throw new Exception("Invalid input, container/contained string should be bigger than zero");
            }

            start = -1;
            end = -1;

            var indexes = new List<int>();
            for (int i = 0; i < containedString.Length; i++)
            {
                char containedChar = containedString[i];
                int index = -1;
                for (int j = 0; j < containerString.Length; j++)
                {
                    char containerChar = containerString[j];
                    if (containerChar == containedChar)
                    {
                        index = j;
                        break;
                    }
                }

                if (index == -1)
                {
                    return false;
                }
                indexes.Add(index);
            }

            indexes.Sort();
            start = indexes[0];
            end = indexes[indexes.Count - 1];
            return true;
        }
    }