如何在转发器Asp.Net C#中更改LinkButton内的图像源

<asp:LinkButton ID="linkButtonID" runat="server" OnClick="linkButton_Click">
    <asp:Image ID="imageID" runat="server" ImageUrl="初始图像源路径" />
</asp:LinkButton>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        LinkButton linkButton = (LinkButton)FindControl("linkButtonID");
        linkButton.ImageUrl = "新的图像源路径";
    }
}

protected void linkButton_Click(object sender, EventArgs e)
{
    // 在LinkButton的Click事件处理程序中执行其他操作
}