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<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="caseno"
GridLines="None" Width="100%" OnPageIndexChanging="saleslog_PageIndexChanging" PageSize="5">
<AlternatingRowStyle BackColor="#DCDCDC" />
<AlternatingRowStyle CssClass="AltRowStyle" />
<Columns>
<%-- <asp:BoundField DataField="custno" HeaderText="客户代码" ReadOnly="True"
SortExpression="custno" />
<asp:BoundField DataField="customer" HeaderText="客户名称" ReadOnly="True"
SortExpression="customer" />--%>
<asp:TemplateField HeaderText="图片">
<ItemTemplate>
<br />
<asp:Image ID="Image1" runat="server" ImageUrl='<%# "/uploadsale/"+Eval("filename") %>' Width="1000" Height="600" /><br />
<table>
<tr><td><asp:Label ID="caseno1" runat="server" Text='<%#Eval("caseno") %>' Font-Size="15px" ForeColor="Blue" />
<asp:Label ID="custno1" runat="server" Text='<%#Eval("custno") %>' Font-Size="15px" ForeColor="Blue"></asp:Label>
(<asp:Label ID="sda" runat="server" Text='<%#Eval("customer") %>' Font-Size="18px"></asp:Label>)</td>
<td> 备注:<asp:TextBox ID="contents1" runat="server" Text='<%#Eval("contents") %>'></asp:TextBox></td>
<td><asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="true" CommandName="update" Text="更新" OnClick="update_contents" OnClientClick="alert('记录储存成功!');hiddenModalPopup();" Font-Size="Medium"></asp:LinkButton>
</td></tr></table>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="查看">
<ItemTemplate>
<asp:Button runat="server" ID="lnkExpenDetails" Text='查看' OnClick="lnkExpenDetails_Click" CommandName="Select" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EmptyDataRowStyle CssClass="EmptyRowStyle" />
<HeaderStyle CssClass="HeaderStyle"/>
<PagerStyle CssClass="PagerStyle" />
<RowStyle CssClass="RowStyle" />
<SelectedRowStyle CssClass="SelectedRowStyle" />
</asp:GridView>
怎么获取gridview里的id=contents1的文本框呢 想在gridview里对数据库进行查改。