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class StringSearch{    static void Main()    {        string str = "A silly sentence used for silly purposes.";        System.Console.WriteLine("'{0}'",str);        bool test1 = str.StartsWith("a silly");        System.Console.WriteLine("starts with 'a silly'? {0}", test1);        bool test2 = str.StartsWith("a silly", System.StringComparison.OrdinalIgnoreCase);        System.Console.WriteLine("starts with 'a silly'? {0} (ignoring case)", test2);        bool test3 = str.EndsWith(".");        System.Console.WriteLine("ends with '.'? {0}", test3);        int first = str.IndexOf("silly");        int last = str.LastIndexOf("silly");        string str2 = str.Substring(first, last - first);        System.Console.WriteLine("between two 'silly' words: '{0}'", str2);    }}