public void Test02_ExtensionMethod()
        {
            #region Arrange

            PictureBox myPB = new PictureBox();
            myPB.Name = "My Box";

            #endregion

            #region Act

            string lastChar = myPB.ExtensionPB();

            #endregion

            #region Assert

            Assert.AreEqual("x", lastChar);

            #endregion
        }