aspxgridView更新取不到新值解决方法_ASP.NET

aspxgridView更新取不到新值
是aspxgridview不是gridview回答的麻烦看清楚，谢谢

我把列转换成了GridViewDataComboBoxColumn这种

HTML code

                        <dx:GridViewDataComboBoxColumn Caption="带班老师" VisibleIndex="3" FieldName="gangerTeacher" >                            <PropertiesComboBox  ValueType="System.String">                            </PropertiesComboBox>                        </dx:GridViewDataComboBoxColumn>

然后绑定了在编辑状态的值

C# code

protected void CoursesDetailsGV_CellEditorInitialize(object sender, DevExpress.Web.ASPxGridView.ASPxGridViewEditorEventArgs e)    {                if(CoursesDetailsGV.IsEditing)        {            if (e.Column.FieldName == "gangerTeacher")            {                ASPxComboBox combo = e.Editor as ASPxComboBox;                combo.ID = "gangerTeacherDdl11";                combo.TextField = "englishName";                combo.ValueField = "chineseName";                DataTable tempdt = Employees.GetEmployeeName(1).Tables[0];                DataRow tempdr = tempdt.NewRow();                tempdr["englishName"] = " ";                tempdr["chineseName"] = " ";                tempdt.Rows.Add(tempdr);                combo.DataSource = tempdt;                combo.DataBind();            }}

但是点更新的时候无论如何变都只能取到原来的值，无法获得我改变的值

C# code

    protected void CoursesDetailsGV_RowUpdating(object sender, DevExpress.Web.Data.ASPxDataUpdatingEventArgs e)    {        int singleCount=Convert.ToInt16(e.NewValues["singleCount"]);        string singleTime = Convert.ToString(e.NewValues["singleTime"]);        string gangerTeacher1 = Convert.ToString(e.NewValues["gangerTeacher"]);        string gangerTeacher2 = Convert.ToString(e.OldValues["gangerTeacher"]);        string gangerTeacher3 = Convert.ToString(e.Keys["gangerTeacher"]);        string gangerTeacher = (CoursesDetailsGV.FindControl("gangerTeacherDdl11") as ASPxComboBox).Text;        string foreignTeacher = (CoursesDetailsGV.FindControl("foreignTeacherDdl") as ASPxComboBox).Text;        DataTable dt = (DataTable)ViewState["dt"];        e.Cancel = true;        CoursesDetailsGV.CancelEdit();    }

int singleCount=Convert.ToInt16(e.NewValues["singleCount"]);
string singleTime = Convert.ToString(e.NewValues["singleTime"]);

这两行能取到新值，从第3行开始，都是取不到值，全部是" ";

string gangerTeacher1 = Convert.ToString(e.NewValues["gangerTeacher"]);
string gangerTeacher2 = Convert.ToString(e.OldValues["gangerTeacher"]);
string gangerTeacher3 = Convert.ToString(e.Keys["gangerTeacher"]);

下面这行能取到值，但是是原来的值，取不到修改后的
string gangerTeacher = (CoursesDetailsGV.FindControl("gangerTeacherDdl11") as ASPxComboBox).Text;

这怎么办？

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是不是缓存问题？
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没用过aspxgridview，
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