GridView edit - new values after wirte in textbox/dropdownlist

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C#

ASP.NET

I have problem with edit date in gridview.When I edit gridview i want update one of cell. So enter new value in this cell, and problem is that i don't have any idea how can i download this new value because than i write:

(textbox)(gridview.Rows(e.RowIndex).Cells[2].Control[0]).Text.ToString()

I download old value not new.
Can someone help me ?

12-12-2011

This link didn't help i still have this problem.
I change text box to dropdown list but i have still this problem.
Now i have something like tihs :

<Columns>
                        <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
                        <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" 
                            SortExpression="ID" />
                            <asp:TemplateField>
                                <ItemTemplate>
                                    <asp:Label ID="Teacher_name" runat="server" Text='<%# Eval("Teacher_name") %>'></asp:Label>
                                </ItemTemplate>
                                <EditItemTemplate> 
                                    <asp:DropDownList ID="ddlEditTeacher" runat="server" 
                                        DataSourceID="SqlDataSource1" DataTextField="Teacher_name"  
                                        DataValueField="Teacher_name" 
                                      ></asp:DropDownList>
                                    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                                        ConnectionString="<%$ ConnectionStrings:DiaryConnectionString %>" 
                                        SelectCommand="SELECT Teachers.name+' '+Teachers.surname AS[Teacher_name] FROM Teachers">
                                    </asp:SqlDataSource>
                                </EditItemTemplate>
                            </asp:TemplateField>

but still when i edit item i can use new select values. For example if drop down list have to values "A" and "B". Now in grid view is value "A". When i want change this value, i click on edit and select in drop down list value "B" but in function gv_RowUpdating when i write

GridViewRow row = gvMajor.Rows[e.RowIndex];
                string text=
                ((DropDownList) (row.Cells[3].FindControl(ddlEditTeacher)).SelectedValues;

I have still value "A" not "B" why ?