System.Data.Tests.DataRowCollectionTest.AutoIncrement C# (CSharp) Method

        public void AutoIncrement()
        {
            DataColumn col = new DataColumn("Auto");
            col.AutoIncrement = true;
            col.AutoIncrementSeed = 0;
            col.AutoIncrementStep = 1;

            _tbl.Columns.Add(col);
            _tbl.Rows.Add(_tbl.NewRow());

            Assert.Equal(0, Convert.ToInt32(_tbl.Rows[0]["Auto"]));

            _tbl.Rows.Add(_tbl.NewRow());
            Assert.Equal(1, Convert.ToInt32(_tbl.Rows[1]["Auto"]));

            col.AutoIncrement = false;
            Assert.Equal(1, Convert.ToInt32(_tbl.Rows[1]["Auto"]));

            _tbl.Rows.Add(_tbl.NewRow());
            Assert.Equal(DBNull.Value, _tbl.Rows[2]["Auto"]);

            col.AutoIncrement = true;
            col.AutoIncrementSeed = 10;
            col.AutoIncrementStep = 2;

            _tbl.Rows.Add(_tbl.NewRow());
            Assert.Equal(10, Convert.ToInt32(_tbl.Rows[3]["Auto"]));
            _tbl.Rows.Add(_tbl.NewRow());
            Assert.Equal(12, Convert.ToInt32(_tbl.Rows[4]["Auto"]));

            col = new DataColumn("Auto2");
            col.DataType = typeof(string);
            col.AutoIncrement = true;
            col.AutoIncrementSeed = 0;
            col.AutoIncrementStep = 1;
            _tbl.Columns.Add(col);

            _tbl.Rows.Add(_tbl.NewRow());
            Assert.Equal(typeof(int), _tbl.Columns[1].DataType);
            Assert.Equal(typeof(int), _tbl.Rows[5]["Auto2"].GetType());

            col = new DataColumn("Auto3");
            col.AutoIncrement = true;
            col.AutoIncrementSeed = 0;
            col.AutoIncrementStep = 1;
            col.DataType = typeof(string);
            Assert.Equal(typeof(string), col.DataType);
            Assert.False(col.AutoIncrement);
        }