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？
[解决办法]
GridView新赋值的语句在哪里
[解决办法]
//GridView改为只读状态
this.GridView1.EditIndex = -1;