public void IsDBNull()
{
DataTable table = new DataTable();
table.Columns.Add("State", typeof(string));
table.Columns.Add("Direction", typeof(string));
table.Columns.Add("Count", typeof(int));
table.Columns.Add("Sum", typeof(int));
table.Rows.Add(new object[]{DBNull.Value, "North", DBNull.Value, 2});
IDataReader reader = new TableDataReader(table);
reader.Read();
Assert.IsTrue(reader.IsDBNull(0));
Assert.IsFalse(reader.IsDBNull(1));
Assert.IsTrue(reader.IsDBNull(2));
Assert.IsFalse(reader.IsDBNull(3));
}
