private void UncheckAllToolStripMenuItem_Click(object sender, EventArgs e)
{
for (int i = 0; i < SourceClasses.Items.Count; i++)
{
SourceClasses.SetItemCheckState(i, CheckState.Unchecked);
}
}
private void InvertToolStripMenuItem_Click(object sender, EventArgs e)
{
for (int i = 0; i < SourceClasses.Items.Count; i++)
{
var stateChecked = SourceClasses.GetItemCheckState(i) == CheckState.Checked;
SourceClasses.SetItemCheckState(i, (stateChecked ? CheckState.Unchecked : CheckState.Checked));
}
}