Arduino + C# + RFID?

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I can get the id of tag with this snippet of code and play in a Textbox, but, it would take information from which reader RFID she was read?

serialPort1.Open();
string entrada = serialPort1.ReadLine();
serialPort1.Close();
txt_tag.Text = entrada;
c# winforms arduino

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If it is an Arduin with two readers, in the Arduin code you send a code identifying which reader was concatenated with the id read, use a char to separate the two values ';' for example, when receiving the value, use the eating value.split(';'); to obtain the separate values.

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