[Solved] “Method must have a return type” [closed]

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It means that you’r Send method does not have a return type. Meaning that you don’t return anything in that method. If that method shouldn’t return anything, then just add void as a return type:

public void Send(SerialPort serialPort1)
    {
        if (serialPort1.IsOpen) 
        {
            var content = new List<byte>();
            content.Add(2);
            content.AddRange(Encoding.ASCII.GetBytes(CommandText));
            content.Add(3);
            byte[] buffer = content.ToArray();
            serialPort1.Write(buffer, 0, buffer.Length);
        }
    }

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solved “Method must have a return type” [closed]