char[] buf = new char [40];
            //char[] buf = null;
            SqlChars chars = new SqlChars("This is a test for SqlChars.Read");
            try
            {
                chars.Read(0, buf, 0, (int)chars.Length);
            }
            catch (Exception e)
            {
                Console.WriteLine("Exception type = {0}", e.GetType());
            }

            for (int i = 0; i < 40; i++)
                buf[i] = Convert.ToChar (32+i+1);

            try
            {
                chars.Write(0, buf, 0, buf.Length);
            }
            catch (Exception e)
            {
                Console.WriteLine("Exception type = {0}", e.GetType());
            }