private void button1_Click(object sender, EventArgs e)
{
Excel.Shape lineA = Globals.Sheet1.Shapes.AddLine(25, 140, 495, 140);
Excel.Shape lineB = Globals.Sheet1.Shapes.AddLine(495, 140, 495, 305);
Excel.Shape lineC = Globals.Sheet1.Shapes.AddLine(25, 305, 495, 305);
Excel.Shape lineD = Globals.Sheet1.Shapes.AddLine(25, 140, 25, 305);
object[] shapes = { lineA.Name, lineB.Name, lineC.Name, lineD.Name };
Excel.ShapeRange shapeRange = Globals.Sheet1.Shapes.get_Range(shapes);
shapeRange.Group();
}