从URL将图像加载到Picturebox中

Question

我正在使用C＃编写算法从网站下载图像，我的软件会自动填充所有必填字段并按下下载按钮。问题是我无法加载图像。在Internet Explorer上下载图像的对话框正在出现，因此我需要在单击“生成”按钮后获取图片的URL并将其加载到图片框中。我的代码：

private void simpleButton6_Click(object sender, EventArgs e)
{
    string i = "0";
    HtmlElement hu = webBrowser3.Document.GetElementById("data-text");
    hu.Focus();
    hu.SetAttribute("Value", txtEncodeData.Text);

    HtmlElement hu1 = webBrowser3.Document.GetElementById("color");
    hu1.Focus();
    Color c = customColorBlender1.SelectedColor;
    string hex = c.R.ToString("X2") + c.G.ToString("X2") + c.B.ToString("X2");
    hu1.SetAttribute("Value", hex);

    HtmlElement hu2 = webBrowser3.Document.GetElementById("effect");
    hu2.Focus();
    if (comboBoxEdit1.SelectedIndex == 1)
    {
        i = "1";
    }
    hu2.SetAttribute("Value", i);
    webBrowser3.Document.GetElementById("generate").InvokeMember("click");

    t.Interval = 1000;
    t.Start();
    t.Tick += new EventHandler(t_Tick);

}

void t_Tick(object sender, EventArgs e)
{
    t.Stop();

    String url = Convert.ToString(webBrowser3.Document.GetElementById("download").InvokeMember("click"));
    MessageBox.Show(url);
    pictureBox15.ImageLocation = Convert.ToString((Uri)webBrowser3.Document.GetElementById("download").InvokeMember("click"));
}