C# how substring() a string from (the response of reading from serial port) the number of lines displayed in textbox

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C#

buttons

RichTextBox

namespace ProjectOne
{
 public partial class MainForm : Form
 {
   private void StatusBtn_Click(object sender, EventArgs e)
    {
     //command sent to serial port and responds a series of lines
     string StatusInfoToshow = "?D\r";
     string commForMeter = string.Format(StatusInfoToshow);

     try
     {
      if (statusofMeter.serialPortForApp.IsOpen)
         {
           
            bool doesContain = commForMeter.Contains("\r");
                   
                    if (doesContain)
                    {
                        foreach (char s in commForMeter)
                        {
                            currentDataToShow.serialPortForApp.Write(s.ToString());
                        }
                    }
         }
     }
     catch (Exception)
     {
         statusofMeter.ShowDataInScreenTxtb.Text = "TimeOUT Exception";
     }
  }

int LineCounter= 0;

 public void SerialPortInApp_DataReceived(object sender,SerialDataReceivedEventArgs 
    e) 
  {
  
    DataToSetandGet = serialPortForApp.ReadExisting();
     if (this.InvokeRequired)
     {
      Invoke(new MethodInvoker(delegate {
        Textbox1.AppendText(LineCounter.ToString()+ DataToSetandGet
                                                     .Replace("\n", " ")
                                                     .Replace("\r", "\r\n"));
           }));
     }

  }
 }
}

What I have tried:

int LineCounter= 0;
public void SerialPortInApp_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
 try
 {
   DataToSetandGet = serialPortForApp.ReadExisting();
   if (this.InvokeRequired)
   {
    //I  insert the the increment numbering index for each new line displayed in 
  the  textbox but index start at 0 not 1, if I set LineCounter=1 it print 1 instead of 0 and the 1 again for next line

     Invoke(new MethodInvoker(delegate { 
     Textbox_One.AppendText(LineCounter.ToString() + DataToSetandGet
                                                     .Replace("\n", " ")
                                                     .Replace("\r", "\r\n")); 
          }));
                                
 }
  catch (Exception)
 {
  Textbox_One.Text = "TimeOUT error";
}
}

my button send a command to be listened in serial port and send an answer.
the responds in serial port will show records read from a sensor, and each line(readings from sensor in device connected to port) always start with a zero "0" string character at the beginning of each line.
I would like to Remove() or Substring() that zero "0" when it displays each .

I cannot use Substring()

LineCounter.ToString()+ DataToSetandGet.Substring(n position in string)

because give me an error

'startIndex cannot be larger than length of string.:

this error is because it reads like:

//0 record\r//0 record\r//0 record\r//0 record\r//0 record


Invoke(new MethodInvoker(delegate {
Textbox1.AppendText(LineCounter.ToString()+ DataToSetandGet
.Replace("\n", " ")
.Replace("\r", "\r\n"));
}));

The "\r" carriage return is because the command

befor using LineCounter it displays
//0 record
//0 record
//0 record
//0 record
//0 record

after using counter it displays:How to position index to start at 1 instead of 0
//1 0 record <==if LineCounter=1 but if LineCounter=0 it set first line as zero
//1 0 record and next line as one
//2 0 record
//3 0 record
//4 0 record

correct display should be like: How to Implement Substring() or Remove()
//1 record
//2 record
//3 record
//4 record
//5 record