c#gridview绑定数据来自多个表

1.写一个联合查询的SQL语句，保证可以查询到两张表的数据

string SQL = "select Details.ID,ReferenceNumber,Plaintiff,Defendant,KTSJ,KTRQ,JSSJ,KTFT,CaseName from Details,EAJ_FTSY where ReferenceNumber=AH";

2.将查询数据填充到DataTable中

 DataTable dt = DBHelper.ExecuteSqlGetDataTable(SQL);


//这是我写的数据库查询方法
 /// <summary>
        /// 执行SQL语句，并返回DataTable对象
        /// </summary>
        /// <param name="safeSql">SQL语句</param>
        /// <returns>返回DataTable</returns>
        public static DataTable ExecuteSqlGetDataTable(string safeSql)
        {
            SqlConnection sqlConn = new SqlConnection(connectionString);
            sqlConn.Open();
            DataSet ds = new DataSet();
            SqlCommand cmd = new SqlCommand(safeSql, sqlConn);
            cmd.CommandType = CommandType.Text;
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(ds);
            sqlConn.Close();
            return ds.Tables[0];

        }

3.绑定GridView

       GridView1.DataSource = dt;
        GridView1.DataBind();