Question

Okay, I have a WinForms C# program I am writing in Visual Studio 2010 Express. This program has two forms, the main form called “MainForm”, and a secondary form called “ConfigForm”. The MainForm has a button on it which pops up the ConfigForm.

    private void buttonConfig_Click(object sender, EventArgs e)
    {
        new ConfigForm().Show();
    }

Right now, when you click the button, the ConfigForm pops up wherever it feels like it. It doesn’t necessarily pop up over the MainForm. How do I get it to popup on top of the main form? I have tried setting ConfigForm’s StartPosition to CenterParent, but that doesn’t seem to do anything.

For that matter, how do I “lock” the program while the ConfigForm is open. When the ConfigForm is open, I would prefer if the user doesn’t have the ability to navigate back to the MainForm.

Answer 1

You are probably looking for something like this:

private void buttonConfig_Click(object sender, EventArgs e)
{
  using (ConfigForm cf = new ConfigForm()) {
    cf.ShowDialog(this);
  }
}

And yes, make sure that ConfigForm.StartPosition = CenterParent as you noted.

On the ConfigForm form, you can have your buttons set the DialogResults of the form, like this:

void buttonOK(object sender, EventArgs e) {
  this.DialogResult = DialogResult.OK;
  this.Close();
}

Then your calling convention can be:

private void buttonConfig_Click(object sender, EventArgs e)
{
  using (ConfigForm cf = new ConfigForm()) {
    if (cf.ShowDialog(this) == DialogResult.OK) {
      // do something the user said was ok
    }
  }
}