String Permutation in C#

StringPermutationUsingRecursion.cs

using static System.Console;

public class StringPermuter
{
    private string _word;

    public StringPermuter(string word)
    {
        _word = word;
    }

    public void Permute()
    {
        WriteLine($"Permutations of {_word}");
        Process(_word.Length);
    }

    private void Process(int c)
    {
        if (c == 1)
        {
            WriteLine(_word);
            return;
        }

        for (var i = 0; i < c; i++)
        {
            Process(c - 1);
            Rotate(c);
        };
    }

    private void Rotate(int c)
    {
        var target = _word.Length - c;
        _word = _word.Substring(0, target) 
            + _word.Substring(target + 1) 
            + _word.Substring(target, 1);
    }
}