/// <summary>
/// Move all values from 'Selected Columns' list box to 'Columns' list box
/// </summary>
private void MoveAllFromSelectedColumnsToColumnsAction()
{
for (int i = 0; i < SelectedColumns.Count;)
{
Columns.Add(SelectedColumns.ElementAt(i));
SelectedColumns.RemoveAt(i);
}
}
