Añadida comprobación de error al abrir excel

Author: marcod30

Lector Excel/MainWindow.xaml.cs

@@ -42,13 +42,23 @@ private void BtnOpenFile_Click(object sender, RoutedEventArgs e)
                 ExcelManager = new ExcelManager(openFileDialog.FileName);
                 menu_Export.IsEnabled = true; // enable on correct file read
                 btn_Export.IsEnabled = true;
+                lbl_fileOpenStatus.Foreground = Brushes.Green;
                 lbl_fileOpenStatus.Content =openFileDialog.SafeFileName + " abierto con éxito.";
             }
             else
             {
                 menu_Export.IsEnabled = false;
                 btn_Export.IsEnabled = false;
-                lbl_fileOpenStatus.Content = "";
+                if (!openFileDialog.SafeFileName.Equals(""))
+                {
+                    lbl_fileOpenStatus.Foreground = Brushes.Red;
+                    lbl_fileOpenStatus.Content = "Error al intentar abrir " + openFileDialog.SafeFileName;
+                }
+                else
+                {
+                    lbl_fileOpenStatus.Content = "";
+                }
+
             }
             progressWindow.Close();
         }