C#

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  private const UInt32 WM_KEYDOWN = 0x0100;
 
        public bool PreFilterMessage(ref Message m)
        {
            if (this.ActiveControl is DataGridViewTextBoxEditingControl)
            {
                if (m.Msg == WM_KEYDOWN)
                {
                    Keys keyCode = (Keys)(int)m.WParam & Keys.KeyCode;
 
                    if (keyCode == Keys.Enter)
                    {
 
                        if (this.dgvReadInsert.CurrentCell.ColumnIndex == 4 || this.dgvReadInsert.CurrentCell.ColumnIndex == 10 || this.dgvReadInsert.CurrentCell.ColumnIndex == 6 || this.dgvReadInsert.CurrentCell.ColumnIndex == 12 || this.dgvReadInsert.CurrentCell.ColumnIndex == 13 || this.dgvReadInsert.CurrentCell.ColumnIndex == 14)
 
                            this.dgvReadInsert.CurrentCell = this.dgvReadInsert[6, this.dgvReadInsert.CurrentCell.RowIndex + 1];
 
                        return true;
 
                    }
                }
 
                return false;
 
            }
 
            return false;
 
        }

private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            if (serialPort1.IsOpen)
            {
                RxString = serialPort1.ReadExisting(); 
                this.Invoke(new EventHandler(displayData));
            }
            else
            {
                return;
            }
        }
 

 private void displayData(object sender, EventArgs e)
        {
            int count = 0;
            try
            {
                count = 0;
               if (Regex.Match(RxString, @"\r") != null)
               {
                   RxString = Regex.Replace(RxString, @"\r", "\r\n", RegexOptions.Multiline); // Parse through data to split it up and make it readable
               }
  if (RxString.Contains("ps2="))
               {
                   count = count + 1;
                   txtDiagnostic.Text += count + ", ";
                   int totalLength = RxString.Length;
                   txtDiagnostic.Text += totalLength + ", ";
                   int startDelimiter3 = RxString.IndexOf("ps2=");
                   txtDiagnostic.Text += startDelimiter3 + ", ";
                   string ps2String = RxString.Remove(0, startDelimiter3 + 4);
                   int endDelimiter3 = ps2String.IndexOf("\r\n");
                   txtDiagnostic.Text += endDelimiter3 + ", ";
                   ps2String = ps2String.Remove(endDelimiter3);
                   rtbPressureSensor2.Text = ps2String;
                   txtDiagnostic.Text += ps2String + System.Environment.NewLine;
                   Application.DoEvents();
}
 
    Thread.Sleep(250);
            }
            catch (Exception ex)
            {
                
                MessageBox.Show("displayData() failed " + count + " " + ex.Message);
            }