How can we create Flow Chart controls Decision box and Circle programmatically?

//Decision Box

 Syncfusion.Windows.Forms.Diagram.Rectangle decision = new Syncfusion.Windows.Forms.Diagram.Rectangle(100, 200, 60, 60);

 //Rotate to make as decision box

decision.RotationAngle = 45;

decision.Visible = true;

 //specify the height and width as same to get circle

 Syncfusion.Windows.Forms.Diagram.Ellipse ellipse = new Ellipse(40, 50, 60, 60);

ellipse .FillStyle.Color = Color.Black;

'Decision Box

Dim decision As New Syncfusion.Windows.Forms.Diagram.Rectangle(100, 200, 60, 60)

'Rotate to make as decision box

decision.RotationAngle = 45

decision.Visible = True

'specify the height and width as same to get circle

Dim ellipse = New Ellipse(40, 50, 60, 60)

ellipse.FillStyle.Color = Color.Black