GridView编辑更新取不到新值

 protected void gvWellsManager_RowUpdating(object sender, GridViewUpdateEventArgs e)

        {

            string wNo = ((TextBox)gvWellsManager.Rows[e.RowIndex].Cells[1].Controls[0]).Text.Trim();

            string wName = ((TextBox)(gvWellsManager.Rows[e.RowIndex].Cells[2].Controls[0])).Text.Trim();

            string sBoiler = ((TextBox)(gvWellsManager.Rows[e.RowIndex].Cells[3].Controls[0])).Text.Trim();

            string sManagerArea = ((TextBox)(gvWellsManager.Rows[e.RowIndex].Cells[4].Controls[0])).Text.Trim();

            string sIsSteam = ((TextBox)(gvWellsManager.Rows[e.RowIndex].Cells[5].Controls[0])).Text.ToString().Trim();



            Wells well = new Wells();

            if (well.WellUpdate(wNo, wName, sBoiler, sManagerArea, sIsSteam))

            {

                WellsInfoBind();

            }

        }

这个代码为什么只能取到GridView原有的值，而新修改的值取不到呢？
------解决方案--------------------
GridView新赋值的语句在哪里
------解决方案--------------------
  //GridView改为只读状态
        this.GridView1.EditIndex = -1;