Untitled

public static class Extensions
{
    public static string Repeat(this char character, int frequency)
    {
        return new string(character, frequency);
    }
    public static string Repeat(this string content, int frequency)
    {
        var container = new StringBuilder(frequency * content.Length);
        for (int i = 0; i < frequency; i++)
        {
            container.Append(content);
        }
        return container.ToString();
    }
}