Easy question for someone.....in the code below, why does pictureBox1 not display the rectangle as coded in the Form1 routine, but when I press the Button1, it appears?
I wrote this test program because I have a program where I have a pictureBox and a gridView in a TabControl. I bind the gridView and draw in the pictureBox when the form loads, but when I click on the tab, the gridView displays the data, but the pictureBox is empty. If I re-draw in the picturebox or rebind the gridview based on a button click, all gets displayed perfectly.
Am I using the wrong function to create the rectangle? Should I be using some Drawxxx instead of CreateGraphics?
Thank you in advance for your time and expertise in helping on this matter. Beers on me !
Rob
namespace WindowsFormsTestRectangle
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
Rectangle r = new Rectangle(2, 2, 20, 10); //left,top,width,heigth
pictureBox1.CreateGraphics().FillRectangle(Brushes.Red, r); //nothing gets displayed
}
private void button1_Click(object sender, EventArgs e)
{
Rectangle r = new Rectangle(2, 2, 20, 10); //left,top,width,heigth
pictureBox1.CreateGraphics().FillRectangle(Brushes.Red, r); //works fine
}
}
}