public void IsNullTest()
{
int?nullInt = null;
Assert.AreEqual(true, ConvertUtility.IsNull(nullInt));
Assert.AreEqual(true, ConvertUtility.IsNull(null));
Assert.AreEqual(true, ConvertUtility.IsNull(DBNull.Value));
Assert.AreEqual(false, ConvertUtility.IsNull(0));
Assert.AreEqual(false, ConvertUtility.IsNull("Test"));
}