A local variable named 'port' cannot be declared

This question already has an answer here:

C# variable scoping: 'x' cannot be declared in this scope because it would give a different meaning to 'x' 3 answers

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You have a variable named port in your code already. So it doesn't allow you to declare it again in your foreach loop. Change it's name to something else:

foreach (string port2 in ports)
{
    comboBox1.Items.Add(port2);
}

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