title: Scanned value(using scanner) in the textbox
body: <p>I am using <code>Scanner</code> (basic model) to scan the barcode. Scanned barcode will be captured in a textbox. In <code>txtBarcode_TextChanged</code> event, I am getting the barcode to access.</p>
  <p>Problem:</p>
  <p>If I click the scanner more than once, the barcode gets append with the previous value.</p>
  <p><strong>My Code:</strong></p>
  <pre><code>protected void txtBarcode_TextChanged(object sender, EventArgs e)
  {
      string txt = this.txtBarcode.Text;
      this.txtBarcode.Text = string.Empty;
  }
  </code></pre>