I want to only invalidate 1 graphic (an ellipse) from a picture box

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Visual-Studio

C#6.0

The thing is there are 3 shapes in my picture box a circle(Ellipse) and 2 Rectangles i want to only invalidate the circle is there a way to do that.

The circle goes up and down while rectangles move towards the left when the rectangles disappear 2 more show up

The first para is me making the colour and graphics
The second para is making the bird
the third para is me making 2 opposite walls which will always have space betweem them

However when i use my UpdateScreen function to make the bird move and create a video affect the bird moves however the walls move and respawn making it a jittery mess
A visual representation

A visual representation

https://youtu.be/zYg4GA5XeMw

What I have tried:

i have tried putting circle and rectangle in different methods when they are called but the command i use Canvas.Invalidate (Canvas being picture box) hence it refreshes the whole picture box

SolidBrush Yellow = new SolidBrush(Color.Yellow);
            Graphics Canvas = e.Graphics;

//Make Bird
            Canvas.FillEllipse(Yellow, Bird.X, Bird.Y, Settings.WidthBird, Settings.HeightBird);

//Make Bird
            //Max Height
            int MAxHeight = PbCanvas.Size.Height;
            int MH = MAxHeight - 80;
            int HeightD = random.Next(0, MAxHeight - 80);
            int HeightU = MH - HeightD;
            int Bottom = PbCanvas.Bottom;
            new Settings();
            //Walls
            Canvas.FillRectangle(Black, X, 0, 50, HeightU);
            Canvas.FillRectangle(Black, X, Bottom - HeightD, 50, HeightD);
                                      //X        //Y         //W  //H