System.Drawing.Drawing2D.Matrix.Invert C# (CSharp) Method

        public void Invert()
        {
            transform = transform.Invert ();
        }

        public override void DrawRect(System.Drawing.RectangleF dirtyRect)
        {
            Graphics g = new Graphics();
            int offset = 20;

            // Invert matrix:
            Matrix m = new Matrix(1, 2, 3, 4, 0, 0);
            g.DrawString("Original Matrix:", this.Font, Brushes.Black, 10, 10);
            DrawMatrix(m, g, 10, 10 + offset);
            g.DrawString("Inverted Matrix:", this.Font, Brushes.Black, 10, 10 + 2*offset);
            m.Invert();
            DrawMatrix(m, g, 10, 10 + 3 * offset);

            // Matrix multiplication - MatrixOrder.Append:
            Matrix m1 = new Matrix(1, 2, 3, 4, 0, 1);
            Matrix m2 = new Matrix(0, 1, 2, 1, 0, 1);
            g.DrawString("Original Matrices:", this.Font, Brushes.Black, 10, 10 + 4 * offset);
            DrawMatrix(m1, g, 10, 10 + 5 * offset);
            DrawMatrix(m2, g, 10 + 130, 10 + 5 * offset);
            m1.Multiply(m2, MatrixOrder.Append);
            g.DrawString("Resultant Matrix - Append:", this.Font, Brushes.Black, 10, 10 + 6 * offset);
            DrawMatrix(m1, g, 10, 10 + 7 * offset);

            // Matrix multiplication - MatrixOrder.Prepend:
            m1 = new Matrix(1, 2, 3, 4, 0, 1);
            m1.Multiply(m2, MatrixOrder.Prepend);
            g.DrawString("Resultant Matrix - Prepend:", this.Font, Brushes.Black, 10, 10 + 8 * offset);
            DrawMatrix(m1, g, 10, 10 + 9 * offset);
        }