public void DBNullCoalese_Test()
{
String nullString = null;
String emptyString = String.Empty;
DateTime defaultDateTime = default(DateTime);
Assert.True(nullString.DBNullCoalese() is DBNull);
Assert.True(emptyString.DBNullCoalese() is DBNull);
Assert.True(defaultDateTime.DBNullCoalese() is DBNull);
Int32 notNullOrDefault = 1;
Assert.False(notNullOrDefault.DBNullCoalese() is DBNull);
}