public void Sys_types_null()
{
types t = new types();
List<types> tl = t.ToList;
Assert.AreEqual<List<types>>(tl, null);
}
public void Sys_types()
{
types t = new types(connStr);
List<types> tl = t.ToList;
Assert.AreNotEqual<List<types>>(tl, null);
}