private void InitProgressBar(int maximum, int discardlines, int discardbytes)
{
uploadlabel.Visible = true;
uploadprogress.Visible = true;
uploadprogress.Value = 0;
uploadprogress.Maximum = maximum;
for (var i = 0; i < discardlines; i++)
ReadLine();
for (var i = 0; i < discardbytes; i++)
serialPort.ReadByte();
}