private void uploadToYouTubePublicToolStripMenuItem_Click(object sender, EventArgs e)
{
string msg = "";
lock (ThreadLock)
{
for (int i = 0; i < flowPreview.Controls.Count; i++)
{
var pb = flowPreview.Controls[i] as PreviewBox;
if (pb != null && pb.Selected)
{
bool b;
msg = YouTubeUploader.Upload(pb.Oid, pb.FileName, out b);
}
}
}
if (msg != "")
MessageBox.Show(this, msg);
}