C#. How do I write a function that can search a char within a string and return the number of occurrences?

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C#

Visual-Studio

Hi! I need a function who searches a string and find the number of occurrences of a given char within this given string. Can you help ? thank you.

I have tried this code below and it just gives all the chars within the string .. and my teacher said it was too complicated and I need to simplified it. And maybe I should define a string and a char and use a if else statement .. and I can't think of something else .. so please any ideas will be welcomed.

Sorry if you don't understand it well enough English is my second language and I tried to express myself as clearly as I can.

What I have tried:

namespace ConsoleApplication5
{
    class ex3
    {
        static void Main(string[] args)
        {
            string str = "aabb12cc";
            var count = CharacterCount.Count(str);
            foreach (var character in count)
            {
                Console.WriteLine("{0}-{1}", character.Key, character.Value);
            }
        }

    }
    class CharacterCount
    {
        public static SortedDictionary<char, int=""> Count(string stringToCount)
        {
            SortedDictionary<char, int=""> characterCount = new SortedDictionary<char, int="">();
            foreach (var character in stringToCount)
            {
                int counter = 0;
                characterCount.TryGetValue(character, out counter);
                characterCount[character] = counter + 1;
            }
            return characterCount;
        }
    }
}