GridView 中放textbox 有关问题

GridView 中放textbox 问题
我在GridView 里放了个textbox 控件并加了 ontextchanged="TextBox1_TextChanged" 
接下来如何获取 textbox1 里的值呢？
代码:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CssClass="Table-00" Width="100%" CellSpacing="1"  
  DataKeyNames="Id" onrowcommand="GridView1_RowCommand" 
  onrowdatabound="GridView1_RowDataBound" CellPadding="4" ForeColor="#333333" GridLines="None"  
  >
  <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
  <Columns>
  <asp:TemplateField HeaderText="选择">
  <ItemTemplate>
  <asp:CheckBox ID="CheckBox1" runat="server" />
  </ItemTemplate>
  </asp:TemplateField>
  <asp:TemplateField HeaderText="信息名称">
  <ItemTemplate>
  <asp:Label ID="Label1" runat="server" Text='<%#Eval("titles") %>'></asp:Label>
  </ItemTemplate>
  </asp:TemplateField>
  <asp:TemplateField HeaderText="排序">
  <ItemTemplate>
 <asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" ontextchanged="TextBox1_TextChanged" text='<%#Eval("sort") %>'></asp:TextBox> </ItemTemplate>
  </asp:TemplateField>
  <asp:TemplateField HeaderText="删除操作">
  <ItemTemplate>
  <asp:ImageButton ID="ImageButton1" Width="15px" Height="15px" ImageUrl="../images/d.ico" CommandName="ImageButton1" runat="server" />
  </ItemTemplate>
  </asp:TemplateField>
  <asp:TemplateField HeaderText="修改/查看">
  <ItemTemplate>
  <asp:ImageButton ID="ImageButton2" CommandName="ImageButton2" Width="15px" Height="15px" ImageUrl="../images/u.ico" runat="server" />
  </ItemTemplate>
  </asp:TemplateField>
  </Columns>
  <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
  <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
  <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
  <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />

  <EditRowStyle BackColor="#999999" />
  <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
  </asp:GridView>


我是想改变了 textbox 的值后，ontextchanged="TextBox1_TextChanged" 就直接更新 数据库里的数据

[解决办法]
参考：

C# code

string newAssortmentOneName = ((TextBox)(gvAssortment.Rows[e.RowIndex].Cells[1].FindControl("txtAssortmentOneName"))).Text.ToString().Trim();
[解决办法]
在GridView1_RowDataBound事件方法里：
if(e.Row.RowIndex>-1)
{
TextBox tb=e.Row.FindControl("TextBox1") as TextBox;
}