public void ContainsColumn()
{
CellRangeAddress region = new CellRangeAddress(10, 12, 3, 5);
Assert.IsFalse(region.ContainsColumn(2));
Assert.IsTrue(region.ContainsColumn(3));
Assert.IsTrue(region.ContainsColumn(4));
Assert.IsTrue(region.ContainsColumn(5));
Assert.IsFalse(region.ContainsColumn(6));
}