Can you provide me code for C# windows form application to read only last ten charcters of QR code using scanner?

Here the code, please modify it to read only last ten charcters.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Barcodetesting_14_7
{
public partial class Form1 : Form
{

private Dictionary<textbox, textbox=""> TextBoxOrder = new Dictionary<textbox, textbox="">();
private void Form1_Load(object sender, EventArgs e)
{

}

public Form1()
{
InitializeComponent();

TextBoxOrder.Add(BarcodeInput1, BarcodeInput2);
TextBoxOrder.Add(BarcodeInput2, BarcodeInput3);
TextBoxOrder.Add(BarcodeInput3, BarcodeInput1);

BarcodeInput1.Tag = 1;
BarcodeInput2.Tag = 2;
BarcodeInput3.Tag = 3;

BarcodeInput1.KeyDown += BarcodeInputKeyDown;
BarcodeInput2.KeyDown += BarcodeInputKeyDown;
BarcodeInput3.KeyDown += BarcodeInputKeyDown;

BarcodeInput1.Leave += BarcodeInputLeave;
BarcodeInput2.Leave += BarcodeInputLeave;
BarcodeInput3.Leave += BarcodeInputLeave;
}

private void BarcodeInputKeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter && ActiveControl.GetType() == typeof(TextBox))
{
TextBox nextTextBox;
if (TextBoxOrder.TryGetValue((TextBox)ActiveControl, out nextTextBox))
{
e.Handled = true;
e.SuppressKeyPress = true;
nextTextBox.Focus();
}
}
}

private void BarcodeInputLeave(object sender, EventArgs e)
{
if (sender.GetType() == typeof(TextBox))
{
TextBox textBox = (TextBox)sender;
if (textBox.Tag.GetType() == typeof(int))
{
BarcodeScanned(textBox.Text, (int)textBox.Tag);
}
}
}

private void BarcodeScanned(string barcode, int order)
{
DemoLabel.Text = order.ToString() + ": " + barcode;
}
}
}

ok, thanks