Сканер штрих кода возвращает только первую цифру только почему и как вернуть полный номер

Problem

Barcode scanner return only first digit only why and How to Return Full Number as 6221133347389 

6221133347389 return 6
4716201020476 return 4

screen shoot debug
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Barcode read 2d for Items 

Barcode Device DataLogic Lite QW2100

MODEL QY2100

CLASS QY2120-BK

S/N G17079019

when reading  ItemCode '       6294004851032' by barcode scanner it return 6 only as first digit

why it return first digit only 

i need to return full number .

What I have tried:

<pre>DateTime _lastKeystroke = new DateTime(0);
    List<char> _barcode = new List<char>(20);
public PosFrm()
    {


        InitializeComponent();
        this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.PosFrm_KeyPress);

    }
private void PosFrm_KeyPress(object sender, KeyPressEventArgs e)
    {
        TimeSpan elapsed = (DateTime.Now - _lastKeystroke);
        if (elapsed.TotalMilliseconds > 100)
            _barcode.Clear();

        // record keystroke & timestamp
        _barcode.Add(e.KeyChar);
        _lastKeystroke = DateTime.Now;
        //		e.KeyChar	52 '4'	char

        // process barcode
        if (e.KeyChar == 13 && _barcode.Count > 0)
        {


            string msg = new String(_barcode.ToArray());
            MessageBox.Show(msg);
            _barcode.Clear();
        }
    }