123

private void button2_Click(object sender, EventArgs e)
{
string url = "";
for (int i = 0; i < urls.Count; i++)
{
if (!string.IsNullOrEmpty(urls[i]))
{
url = urls[i];
urls[i] = "";
break;
}
}

var doc = webBrowser1.Document.Window.Frames[0].Document;
HtmlElement elefile = doc.GetElementById("file_test");
ImitateSelectFile temobj = new ImitateSelectFile();
temobj.Select(elefile, url);
}