Barcode scanner return only first digit only why and how to return full number

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();
        }
    }