DataSet ds = new DataSet();
DataTable dt1 = Common.TestData.StudentTable.Copy();
dt1.TableName = "dt1";
DataTable dt2 = Common.TestData.StudentTable.Copy();
dt2.TableName = "dt2";
ds.Tables.Add(dt1);
ds.Tables.Add(dt2);
DataRelation relation = new DataRelation("Level2", ds.Tables[0].Columns[0], ds.Tables[1].Columns[0]);//这个Level2要与GridView的关系相同
ds.Relations.Add(relation);
MainGrid.DataSource = ds.Tables[0];