Create a snippet of text with the specified length

snippet.cs

public static string CreateSnippet(string s, int length)
    {
        if (String.IsNullOrEmpty(s))
        {
            return "";
        }
        const string Ellipsis = "...";

        if (s.Length > length)
        {
            return s.Substring(0, length - Ellipsis.Length) + Ellipsis;
        }
        else
        {
            return s;
        }
    }