Question

private void histogramGraphsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Location = new Point(0, 0);
            HistogramGraphs1 = new Lightnings_Extractor.Histogram_Graphs();
            HistogramGraphs1.Show();
            HistogramGraphs1.FormClosing += new FormClosingEventHandler(HistogramGraphs1_FormClosing);
            histogramGraphsToolStripMenuItem.Enabled = false;

        }



private void HistogramGraphs1_FormClosing(object sender , FormClosingEventArgs e)
    {
        this.StartPosition = FormStartPosition.CenterScreen;
        histogramGraphsToolStripMenuItem.Enabled = true;
    }

First time i put the Form in position 0,0
then on the Closing event i want it to back to the center screen but the Form is still in 0,0 position.

How can i fix it ?

Answer 1

First prevent to close this form by set e.Cancel = true. then move window to center of screen:

private void HistogramGraphs1_FormClosing(object sender , FormClosingEventArgs e)
{
    histogramGraphsToolStripMenuItem.Enabled = true;
    e.Cancel = true;
    int x = Screen.PrimaryScreen.WorkingArea.Width / 2 - this.Width / 2;
    int y = Screen.PrimaryScreen.WorkingArea.Height / 2 - this.Height / 2;
    this.Location = new Point(x, y);
}

and this MSDN article may be useful:

• Setting the Screen Location of Windows Forms

explain:

CancelEventArgs.Cancel: Gets or sets a value indicating whether the event should be canceled.

Form.Location Property: Gets or sets the Point that represents the upper-left corner of the Form in screen coordinates.