C# Extract only unique letters from a String

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Ready to use method to extract only unique letters from a string.

// this is the string that you will be passing from another class
string str = "1%O34nn$l!5y-LLLLL$e&^&tt#&e@!rr=s";

// This is the method you can use to process your string
public string GetUniqueLettersFromAString(string str){

  string onlyUniqueLetters = "";
  
  for (int i = 0; i < str.Count(); i++)
  {
      if (char.IsLetter(str[i]))
      {
          if (!onlyUniqueLetters.Contains(str[i]))
          {
              onlyUniqueLetters += str[i];
          }
      }
  return onlyUniqueLetters;
}

// returned string output: OnlyLetrs

Instructions:
To use the method – copy and paste it in your class, rename string variables and enter or pass a string you need to extract unique letters from.

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