private void MenuItemFileOpen_Click(object sender, EventArgs e)
{
using (OpenFileDialog openFileDialog = new OpenFileDialog())
{
openFileDialog.InitialDirectory = Directory.GetCurrentDirectory();
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
Tube.LoadFile(openFileDialog.FileName);
SetCaption(Tube.FileName);
}
}
}