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Chỉ cho phép login qrcode 1 lần
Thêm timeout cho read cassete

UserControl/WelcomeUC.xaml.cs

@@ -55,6 +55,7 @@ namespace SafeBagDE70
         {
             gridInfor.Visibility = Visibility.Collapsed;
             gridMain.Visibility = Visibility.Visible;
+            btnQRCodeLogin.IsEnabled = true;
         }
         public void ShowInfor(string strMessage)
         {
@@ -122,7 +123,7 @@ namespace SafeBagDE70
             {
                 QrCodePanel.Visibility = Visibility.Collapsed;
                 PinCodePanel.Visibility = Visibility.Visible;
-
+                btnQRCodeLogin.IsEnabled = true;
                 cCoreScannerClass.BarcodeEvent -= new _ICoreScannerEvents_BarcodeEventEventHandler(OnBarcodeEvent);
             }
             catch { 
@@ -134,9 +135,10 @@ namespace SafeBagDE70
         {
             PinCodePanel.Visibility = Visibility.Collapsed;
             QrCodePanel.Visibility=Visibility.Visible;
+            btnQRCodeLogin.IsEnabled = false;
+            cCoreScannerClass.BarcodeEvent -= new _ICoreScannerEvents_BarcodeEventEventHandler(OnBarcodeEvent);
             cCoreScannerClass.BarcodeEvent += new _ICoreScannerEvents_BarcodeEventEventHandler(OnBarcodeEvent);
 
-
         }
         public void InitQRCodeScanner()
         {
@@ -222,7 +224,12 @@ namespace SafeBagDE70
                     }
 
                 });
-            }    
+            }
+            Dispatcher.Invoke(() =>
+            {
+                btnQRCodeLogin.IsEnabled = true;
+            });
+
            
         }
         private void VerifyQRCode(string decodedString,out string? ConsumerID)