ASP.net更新DropDownList

<asp:DropDownList ID="ddlExample" runat="server">
    <asp:ListItem Text="Option 1" Value="1" />
    <asp:ListItem Text="Option 2" Value="2" />
    <asp:ListItem Text="Option 3" Value="3" />
</asp:DropDownList>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        // 假设有一个方法GetData()用于从数据库获取数据
        var data = GetData();

        ddlExample.DataSource = data;
        ddlExample.DataTextField = "TextColumn"; // 数据源中的文本列
        ddlExample.DataValueField = "ValueColumn"; // 数据源中的值列
        ddlExample.DataBind();
    }
}

protected void Page_Load(object sender, EventArgs e)
{
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    if (!IsPostBack)
    {
        BindDropDownList();
    }
}

private void BindDropDownList()
{
    // 数据绑定逻辑
}