How to enable only one selected ListBox at a time

Question

I have two ListBoxes: "OnlineProjects" and "Projects" I want the user to be able to select an item from one of them, but not both. when the user clicks on a one ListBox and the an item from the other listbox is selected, the currently selected item will be unselected, and the item the users clicks on will be selected instead.

Is it possible?

Thank you in advance!

Answer 1

Hi avivgood,

When (OnlineProject.Text = "") or (OnlineProjects.SelectedIndex = -1), make "Projects" enabled.
When (OnlineProject.Text <> "") and (OnlineProjects.SelectedIndex <> -1), make "Projects" blank.

Regards,

---

Ashidacchi -- http://hokusosha.com

Answer 2

Hi avivgood,

You can clear a ListBox’s selection by setting “SelectedIndex = -1”.

Here is my code you can refer to.

private void OnlineProjects_SelectedIndexChanged(object sender, EventArgs e)
{
      if (OnlineProjects.SelectedIndex > -1)
      {
                Projects.SelectedIndex = -1;
      }
}

private void Projects_SelectedIndexChanged(object sender, EventArgs e)
{
       if (Projects.SelectedIndex > -1)
       {
                OnlineProjects.SelectedIndex = -1;
       }
}

Best Regards,

Daniel Zhang

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