System.Data.Tests.DataSetTest.RuleTest C# (CSharp) Method

        public void RuleTest()
        {
            DataSet ds = new DataSet("testds");
            DataTable parent = ds.Tables.Add("parent");
            DataTable child = ds.Tables.Add("child");

            parent.Columns.Add("id", typeof(int));
            parent.Columns.Add("name", typeof(string));
            parent.PrimaryKey = new DataColumn[] { parent.Columns["id"] };

            child.Columns.Add("id", typeof(int));
            child.Columns.Add("parent", typeof(int));
            child.Columns.Add("name", typeof(string));
            child.PrimaryKey = new DataColumn[] { child.Columns["id"] };

            DataRelation relation = ds.Relations.Add("parent_child",
                                  parent.Columns["id"],
                                  child.Columns["parent"]);

            parent.Rows.Add(new object[] { 1, "mono test 1" });
            parent.Rows.Add(new object[] { 2, "mono test 2" });
            parent.Rows.Add(new object[] { 3, "mono test 3" });

            child.Rows.Add(new object[] { 1, 1, "mono child test 1" });
            child.Rows.Add(new object[] { 2, 2, "mono child test 2" });
            child.Rows.Add(new object[] { 3, 3, "mono child test 3" });

            ds.AcceptChanges();

            parent.Rows[0]["name"] = "mono changed test 1";

            Assert.Equal(DataRowState.Unchanged, parent.Rows[0].GetChildRows(relation)[0].RowState);

            ds.RejectChanges();
            parent.Rows[0]["id"] = "4";

            DataRow childRow = parent.Rows[0].GetChildRows(relation)[0];
            Assert.Equal(DataRowState.Modified, childRow.RowState);
            Assert.Equal(4, (int)childRow["parent"]);
        }