DataSet set = new DataSet();

            string strConnection = @"Data Source=.\SQLExpress;Initial Catalog=DB_Person;Integrated Security=True";

            using(SqlConnection connect = new SqlConnection(strConnection)) {

                SqlCommand cmd = connect.CreateCommand();



                cmd.CommandText = "select * from [dbo].[T_Employee_01]";    //从表1获取.

                SqlDataAdapter adapterEmployee_01 = new SqlDataAdapter(cmd);

                adapterEmployee_01.Fill(set, "Employee_01");



                cmd.CommandText = "select * from [dbo].[T_Employee_02]";    //从表2获取.

                SqlDataAdapter adapterEmployee_02 = new SqlDataAdapter(cmd);

                adapterEmployee_02.Fill(set, "Employee_02");



                DataTable T_Employee_01 = set.Tables["Employee_01"];

                DataTable T_Employee_02 = set.Tables["Employee_02"];

                T_Employee_01.Merge(T_Employee_02, true, MissingSchemaAction.AddWithKey);   //表的合并.



                dataGV.DataSource = T_Employee_02;  //指定DataGridView数据源.

            }

//最后不管我指定的数据源是两个表中的任何一个,数据都是 T_Employee_01;为什么没有合并两个表(这两个表字段完全一个样的....