GridView 邦定数据源后怎么取某个行的某个字段（关键字字段）
SqlConnection con = Class_data.CreateCon();
con.Open();
SqlCommand cmd = new SqlCommand( "select * from VIEW_action_user ", con);

GridView1.DataSource = cmd.ExecuteReader();

string user_id = GridView1.SelectedDataKey.ToString();//这个为什么取不到？？？


GridView1.DataBind();
con.Close();

[解决办法]
cell[2].tostring