Question

In event handler of Form Load, I have the following code

    Panel pHText = new Panel();
    Font myFont = new Font("Arial", 14);
    pHText.Location=new Point(10,10);
    pHText.Size=new Size(200,200);
    pHText.BackColor = Color.White;
    Graphics g = pHText.CreateGraphics();
    g.DrawLine(new Pen(Color.Black), 0, 0, 10, 10);
    g.DrawString("text", myFont, Brushes.Blue, 10, 10);
    Controls.Add(pHText);

The white Panel is shown in the form, but those drawing of line and string are not.

Answer 1

this code will go in your form load event

Panel pHText = new Panel();
pHText.Name = "ctrId"; //specify control name, to access it in other parts of your code
pHText.Location = new Point(10, 10);
pHText.Size = new Size(200, 200);
pHText.BackColor = Color.White;
pHText.Paint += paintingUrCtr;//adding onpaint event
Controls.Add(pHText)

add paint event named paintingUrCtr.

private void paintingUrCtr(object sender, PaintEventArgs e)
{
        Font myFont = new Font("Arial", 14);
        e.Graphics.DrawLine(new Pen(Color.Black),  0, 0, 10, 10);
        e.Graphics.DrawString("text", myFont, Brushes.Blue, 10, 10);
}