public void AutoIncrementStep()
{
DataSet ds = new DataSet("testds");
DataTable tbl = ds.Tables.Add("testtbl");
DataColumn col = tbl.Columns.Add("id", typeof(int));
col.AutoIncrement = true;
col.AutoIncrementSeed = -1;
col.AutoIncrementStep = -1;
tbl.Columns.Add("data", typeof(string));
Assert.True(ds.GetXmlSchema().IndexOf("AutoIncrementStep") > 0);
}