在gridview模板中使用PopupControlExtender

 <asp:TemplateField HeaderText="产品介绍">
                    <ItemTemplate>
                        <asp:TextBox ID="txtInfo" runat="server"></asp:TextBox>
                        <cc1:PopupControlExtender ID="PopupControlExtender1" runat="server" 
                        TargetControlID="txtInfo" PopupControlID="plInfo" Position="Bottom" 
                         >
                        </cc1:PopupControlExtender>
                        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
                            <ContentTemplate>
                                
                                <asp:Panel ID="plInfo" runat="server" Height="100%" Width="100%" CssClass="popupbox" >
                                    <asp:TextBox ID="txtInfoDet" runat="server" Height="400px" TextMode="MultiLine" 
                                        Width="300px" ></asp:TextBox>
                                    <asp:Button ID="btnPlOk" runat="server" onclick="btnPlOk_Click" Text="确定" 
                                        UseSubmitBehavior="False" />
                                    <asp:Button ID="btnPlCancel" runat="server" onclick="btnPlCancel_Click" 
                                        Text="取消" UseSubmitBehavior="False" /> 
                                </asp:Panel>
                                                        
                            
                            </ContentTemplate>
                            <Triggers>
                                <asp:AsyncPostBackTrigger ControlID="btnPlOk" EventName="Click" />
                            </Triggers>
                        </asp:UpdatePanel>
                        <br />
                    </ItemTemplate>
                  
                    <HeaderStyle Height="20px" />
                    <ItemStyle Height="30px" />
                </asp:TemplateField>

  

protected void btnPlOk_Click(object sender, EventArgs e)
    {
        Button btnPlOk = (Button)sender;
        GridViewRow gvr = (GridViewRow)btnPlOk.NamingContainer;
        TextBox txtInfoDet = (TextBox)gvr.FindControl("txtInfoDet");
        TextBox txtInfo = (TextBox)gvr.FindControl("txtInfo");
     
        PopupControlExtender.GetProxyForCurrentPopup(this.Page).Commit(txtInfoDet.Text);
           
        // PopupControlExtender1.Commit(txtInfoDet.Text); --找不到PopupControlExtender1

    }

在后台需要添加using AjaxControlToolkit; 页面还需要加一个updatepanle 使之包含gridview。。。。。，另外button需要设置 UseSubmitBehavior = false 

注：此代码主要实现在gridview中点一个textbox，弹出另一个textbox来输值，button用来提交。

图示：