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How can I access the variable line in the following subscriber method from another method within the same class:
private void portdatareceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
string line = port.ReadExisting();
}
Make it a field in the class. You cannot access local variables in methods.
After all, classes are data containers and methods act on that data. local variables are just helpers to that end. If they are needed as state in the class, then make them a field.