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在ASPxListBox中如何进行数据绑定，添加或删除Item？

The ASPxListBox control allows you to modify the ASPxListEdit.Items collection on callbacks only (e.g. add and remove items, populate the controls with new data from a data source, etc.).

It is not possible, for example, to modify a column collection, change items selection, or change SelectionMode on callbacks. To perform these actions on the client side, you can wrap the control with theASPxCallbackPanel control and process a required scenario on a callback to the panel.

（来自DevExpress 官方帮助文档）

添加删除Item只能在callback事件中处理，客户端调用语句：

                                        <dx:ASPxButton ID="btnDeleteUpload" runat="server" Text="删除已有" AutoPostBack="false"
                                            Style="margin: 16px auto;">
                                            <ClientSideEvents Click="function(s, e) { listAttachment.PerformCallback(listAttachment.GetSelectedIndex());}" />
                                        </dx:ASPxButton>

PerformCallback的参数可以传递要删除的ItemIndex。

服务器端：protected void listAttachment_Callback(object sender, DevExpress.Web.ASPxClasses.CallbackEventArgsBase e) 中处理数据绑定或者删除Item ，利用e.Parameter的值来判断。

如何实现在listbox中选中所有button？

// Set  - SelectionMode="Multiple" for your ListBox and then do

protected void LinkButton1_Click1(object sender, EventArgs e)
{
    foreach (ListItem li in ListBox1.Items)
    {
        li.Selected = true;
    }
}

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