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DatabaseConnection/MainPage.xaml.cs

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+using DatabaseConnection.View;
+
+namespace DatabaseConnection
+{
+    public partial class MainPage : TabbedPage
+    {
+        public MainPage(AuthorsPage ap, BooksPage bp, ReadersPage rp, WorkersPage wp)
+        {
+            InitializeComponent();
+
+            Children.Add(ap);
+            Children.Add(bp);
+            Children.Add(rp);
+            Children.Add(wp);
+        }
+    }
+
+}