How can you remove duplicate characters in a string?

Question

I have to implements a function that takes a string as an input and finds the non-duplicate character from this string.

So an an example is if I pass string str = \"

Answer 1

Below is the code to remove duplicate chars from a string

        var input = "SaaSingeshe";
        var filteredString = new StringBuilder();
        foreach(char c in input)
        {
            if(filteredString.ToString().IndexOf(c)==-1)
            {
                filteredString.Append(c);
            }
        }
        Console.WriteLine(filteredString);
        Console.ReadKey();