Question

I currently have a string being sent to a TextBox, although instead is it possible to send it to a listbox?

private void buttonLB_Click(object sender, EventArgs e)
{
    string machineName = (@"\\" + System.Environment.MachineName);
    ScheduledTasks st = new ScheduledTasks(machineName);
    // Get an array of all the task names
    string[] taskNames = st.GetTaskNames();
    richTextBox6.Text = string.Join(Environment.NewLine, taskNames);
    st.Dispose();
}

Answer 1

You can add the joined task names as a single item

listbox1.Items.Add(string.Join(Environment.NewLine, taskNames));

Or you can add each of the task names as a separate item

foreach (var taskName in taskNames)
{
    listbox1.Items.Add(taskName);
}