SampleApp.MainForm.openImageToolStripMenuItem_Click C# (CSharp) Method

        private void openImageToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    OpenImage((Bitmap)Bitmap.FromFile(openFileDialog.FileName));

                    // reset image points
                    imagePoints[0] = emptyPoint;
                    imagePoints[1] = emptyPoint;
                    imagePoints[2] = emptyPoint;
                    imagePoints[3] = emptyPoint;

                    imagePoint1Box.Text =
                    imagePoint2Box.Text =
                    imagePoint3Box.Text =
                    imagePoint4Box.Text = string.Empty;

                    // clear current pose estimation
                    ClearEstimation();

                    // set default focal length to image width
                    focalLength = imageSize.Width;
                    focalLengthBox.Text = focalLength.ToString(CultureInfo.InvariantCulture);
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Failed opening selected file.\n\nException: " + ex.Message);
                }
            }
        }