GridView绑定DataKeyName以及如何取这些值

DataKeyNames='FID'   绑定一个值
GridView1.DataKeys[e.Row.RowIndex].Value.ToString;

DataKeyNames='FID,FName'   绑定两个值
GridView1.DataKeys[e.Row.RowIndex].Values[0].ToString;
GridView1.DataKeys[e.Row.RowIndex].Values[1].ToString;