diff --git a/SUBD_Car_rent/Forms/FormMain.Designer.cs b/SUBD_Car_rent/Forms/FormMain.Designer.cs
index a76dce7..0cb3aae 100644
--- a/SUBD_Car_rent/Forms/FormMain.Designer.cs
+++ b/SUBD_Car_rent/Forms/FormMain.Designer.cs
@@ -20,115 +20,154 @@
             base.Dispose(disposing);
         }
 
-        #region Windows Form Designer generated code
+		#region Windows Form Designer generated code
 
-        /// <summary>
-        /// Required method for Designer support - do not modify
-        /// the contents of this method with the code editor.
-        /// </summary>
-        private void InitializeComponent()
-        {
-            menuStrip1 = new MenuStrip();
-            tablesToolStripMenuItem = new ToolStripMenuItem();
-            carModelToolStripMenuItem = new ToolStripMenuItem();
-            carToolStripMenuItem = new ToolStripMenuItem();
-            branchToolStripMenuItem = new ToolStripMenuItem();
-            clientToolStripMenuItem = new ToolStripMenuItem();
-            rentalToolStripMenuItem = new ToolStripMenuItem();
-            buttonTest = new Button();
-            textBoxTest = new TextBox();
-            menuStrip1.SuspendLayout();
-            SuspendLayout();
-            // 
-            // menuStrip1
-            // 
-            menuStrip1.Items.AddRange(new ToolStripItem[] { tablesToolStripMenuItem });
-            menuStrip1.Location = new Point(0, 0);
-            menuStrip1.Name = "menuStrip1";
-            menuStrip1.Size = new Size(435, 24);
-            menuStrip1.TabIndex = 0;
-            menuStrip1.Text = "menuStrip1";
-            // 
-            // tablesToolStripMenuItem
-            // 
-            tablesToolStripMenuItem.DropDownItems.AddRange(new ToolStripItem[] { carModelToolStripMenuItem, carToolStripMenuItem, branchToolStripMenuItem, clientToolStripMenuItem, rentalToolStripMenuItem });
-            tablesToolStripMenuItem.Name = "tablesToolStripMenuItem";
-            tablesToolStripMenuItem.Size = new Size(50, 20);
-            tablesToolStripMenuItem.Text = "tables";
-            // 
-            // carModelToolStripMenuItem
-            // 
-            carModelToolStripMenuItem.Name = "carModelToolStripMenuItem";
-            carModelToolStripMenuItem.Size = new Size(127, 22);
-            carModelToolStripMenuItem.Text = "car model";
-            carModelToolStripMenuItem.Click += carModelToolStripMenuItem_Click;
-            // 
-            // carToolStripMenuItem
-            // 
-            carToolStripMenuItem.Name = "carToolStripMenuItem";
-            carToolStripMenuItem.Size = new Size(127, 22);
-            carToolStripMenuItem.Text = "car";
-            carToolStripMenuItem.Click += carToolStripMenuItem_Click;
-            // 
-            // branchToolStripMenuItem
-            // 
-            branchToolStripMenuItem.Name = "branchToolStripMenuItem";
-            branchToolStripMenuItem.Size = new Size(127, 22);
-            branchToolStripMenuItem.Text = "branch";
-            branchToolStripMenuItem.Click += branchToolStripMenuItem_Click;
-            // 
-            // clientToolStripMenuItem
-            // 
-            clientToolStripMenuItem.Name = "clientToolStripMenuItem";
-            clientToolStripMenuItem.Size = new Size(127, 22);
-            clientToolStripMenuItem.Text = "client";
-            clientToolStripMenuItem.Click += clientToolStripMenuItem_Click;
-            // 
-            // rentalToolStripMenuItem
-            // 
-            rentalToolStripMenuItem.Name = "rentalToolStripMenuItem";
-            rentalToolStripMenuItem.Size = new Size(127, 22);
-            rentalToolStripMenuItem.Text = "rental";
-            rentalToolStripMenuItem.Click += rentalToolStripMenuItem_Click;
-            // 
-            // buttonTest
-            // 
-            buttonTest.Location = new Point(24, 50);
-            buttonTest.Name = "buttonTest";
-            buttonTest.Size = new Size(75, 23);
-            buttonTest.TabIndex = 1;
-            buttonTest.Text = "buttonTest";
-            buttonTest.UseVisualStyleBackColor = true;
-            buttonTest.Click += buttonTest_Click;
-            // 
-            // textBoxTest
-            // 
-            textBoxTest.Location = new Point(121, 51);
-            textBoxTest.Multiline = true;
-            textBoxTest.Name = "textBoxTest";
-            textBoxTest.Size = new Size(251, 75);
-            textBoxTest.TabIndex = 2;
-            // 
-            // FormMain
-            // 
-            AutoScaleDimensions = new SizeF(7F, 15F);
-            AutoScaleMode = AutoScaleMode.Font;
-            ClientSize = new Size(435, 167);
-            Controls.Add(textBoxTest);
-            Controls.Add(buttonTest);
-            Controls.Add(menuStrip1);
-            MainMenuStrip = menuStrip1;
-            Name = "FormMain";
-            Text = "FormMain";
-            menuStrip1.ResumeLayout(false);
-            menuStrip1.PerformLayout();
-            ResumeLayout(false);
-            PerformLayout();
-        }
+		/// <summary>
+		/// Required method for Designer support - do not modify
+		/// the contents of this method with the code editor.
+		/// </summary>
+		private void InitializeComponent()
+		{
+			menuStrip1 = new MenuStrip();
+			tablesToolStripMenuItem = new ToolStripMenuItem();
+			carModelToolStripMenuItem = new ToolStripMenuItem();
+			carToolStripMenuItem = new ToolStripMenuItem();
+			branchToolStripMenuItem = new ToolStripMenuItem();
+			clientToolStripMenuItem = new ToolStripMenuItem();
+			rentalToolStripMenuItem = new ToolStripMenuItem();
+			buttonTest = new Button();
+			textBoxTest = new TextBox();
+			trackBarDB = new TrackBar();
+			labelPostrges = new Label();
+			labelMongoDB = new Label();
+			menuStrip1.SuspendLayout();
+			((System.ComponentModel.ISupportInitialize)trackBarDB).BeginInit();
+			SuspendLayout();
+			// 
+			// menuStrip1
+			// 
+			menuStrip1.Items.AddRange(new ToolStripItem[] { tablesToolStripMenuItem });
+			menuStrip1.Location = new Point(0, 0);
+			menuStrip1.Name = "menuStrip1";
+			menuStrip1.Size = new Size(435, 24);
+			menuStrip1.TabIndex = 0;
+			menuStrip1.Text = "menuStrip1";
+			// 
+			// tablesToolStripMenuItem
+			// 
+			tablesToolStripMenuItem.DropDownItems.AddRange(new ToolStripItem[] { carModelToolStripMenuItem, carToolStripMenuItem, branchToolStripMenuItem, clientToolStripMenuItem, rentalToolStripMenuItem });
+			tablesToolStripMenuItem.Name = "tablesToolStripMenuItem";
+			tablesToolStripMenuItem.Size = new Size(50, 20);
+			tablesToolStripMenuItem.Text = "tables";
+			// 
+			// carModelToolStripMenuItem
+			// 
+			carModelToolStripMenuItem.Name = "carModelToolStripMenuItem";
+			carModelToolStripMenuItem.Size = new Size(127, 22);
+			carModelToolStripMenuItem.Text = "car model";
+			carModelToolStripMenuItem.Click += carModelToolStripMenuItem_Click;
+			// 
+			// carToolStripMenuItem
+			// 
+			carToolStripMenuItem.Name = "carToolStripMenuItem";
+			carToolStripMenuItem.Size = new Size(127, 22);
+			carToolStripMenuItem.Text = "car";
+			carToolStripMenuItem.Click += carToolStripMenuItem_Click;
+			// 
+			// branchToolStripMenuItem
+			// 
+			branchToolStripMenuItem.Name = "branchToolStripMenuItem";
+			branchToolStripMenuItem.Size = new Size(127, 22);
+			branchToolStripMenuItem.Text = "branch";
+			branchToolStripMenuItem.Click += branchToolStripMenuItem_Click;
+			// 
+			// clientToolStripMenuItem
+			// 
+			clientToolStripMenuItem.Name = "clientToolStripMenuItem";
+			clientToolStripMenuItem.Size = new Size(127, 22);
+			clientToolStripMenuItem.Text = "client";
+			clientToolStripMenuItem.Click += clientToolStripMenuItem_Click;
+			// 
+			// rentalToolStripMenuItem
+			// 
+			rentalToolStripMenuItem.Name = "rentalToolStripMenuItem";
+			rentalToolStripMenuItem.Size = new Size(127, 22);
+			rentalToolStripMenuItem.Text = "rental";
+			rentalToolStripMenuItem.Click += rentalToolStripMenuItem_Click;
+			// 
+			// buttonTest
+			// 
+			buttonTest.Location = new Point(75, 229);
+			buttonTest.Name = "buttonTest";
+			buttonTest.Size = new Size(75, 23);
+			buttonTest.TabIndex = 1;
+			buttonTest.Text = "buttonTest";
+			buttonTest.UseVisualStyleBackColor = true;
+			buttonTest.Click += buttonTest_Click;
+			// 
+			// textBoxTest
+			// 
+			textBoxTest.Location = new Point(172, 230);
+			textBoxTest.Multiline = true;
+			textBoxTest.Name = "textBoxTest";
+			textBoxTest.Size = new Size(251, 75);
+			textBoxTest.TabIndex = 2;
+			// 
+			// trackBarDB
+			// 
+			trackBarDB.LargeChange = 1;
+			trackBarDB.Location = new Point(12, 34);
+			trackBarDB.Maximum = 100;
+			trackBarDB.Name = "trackBarDB";
+			trackBarDB.Orientation = Orientation.Vertical;
+			trackBarDB.Size = new Size(45, 64);
+			trackBarDB.TabIndex = 3;
+			trackBarDB.MouseUp += trackBarDB_MouseUp;
+			// 
+			// labelPostrges
+			// 
+			labelPostrges.AutoSize = true;
+			labelPostrges.Font = new Font("Segoe UI", 20F, FontStyle.Regular, GraphicsUnit.Point);
+			labelPostrges.Location = new Point(33, 64);
+			labelPostrges.Name = "labelPostrges";
+			labelPostrges.Size = new Size(117, 37);
+			labelPostrges.TabIndex = 4;
+			labelPostrges.Text = "Postrges";
+			// 
+			// labelMongoDB
+			// 
+			labelMongoDB.AutoSize = true;
+			labelMongoDB.Font = new Font("Segoe UI", 20F, FontStyle.Regular, GraphicsUnit.Point);
+			labelMongoDB.Location = new Point(33, 27);
+			labelMongoDB.Name = "labelMongoDB";
+			labelMongoDB.Size = new Size(138, 37);
+			labelMongoDB.TabIndex = 5;
+			labelMongoDB.Text = "MongoDB";
+			// 
+			// FormMain
+			// 
+			AutoScaleDimensions = new SizeF(7F, 15F);
+			AutoScaleMode = AutoScaleMode.Font;
+			ClientSize = new Size(435, 317);
+			Controls.Add(labelMongoDB);
+			Controls.Add(labelPostrges);
+			Controls.Add(trackBarDB);
+			Controls.Add(textBoxTest);
+			Controls.Add(buttonTest);
+			Controls.Add(menuStrip1);
+			MainMenuStrip = menuStrip1;
+			Name = "FormMain";
+			Text = "FormMain";
+			menuStrip1.ResumeLayout(false);
+			menuStrip1.PerformLayout();
+			((System.ComponentModel.ISupportInitialize)trackBarDB).EndInit();
+			ResumeLayout(false);
+			PerformLayout();
+		}
 
-        #endregion
+		#endregion
 
-        private MenuStrip menuStrip1;
+		private MenuStrip menuStrip1;
         private ToolStripMenuItem tablesToolStripMenuItem;
         private ToolStripMenuItem carModelToolStripMenuItem;
         private ToolStripMenuItem carToolStripMenuItem;
@@ -137,5 +176,8 @@
         private ToolStripMenuItem rentalToolStripMenuItem;
         private Button buttonTest;
         private TextBox textBoxTest;
-    }
+		private TrackBar trackBarDB;
+		private Label labelPostrges;
+		private Label labelMongoDB;
+	}
 }
\ No newline at end of file
diff --git a/SUBD_Car_rent/Forms/FormMain.cs b/SUBD_Car_rent/Forms/FormMain.cs
index 41c5a04..bb1ef64 100644
--- a/SUBD_Car_rent/Forms/FormMain.cs
+++ b/SUBD_Car_rent/Forms/FormMain.cs
@@ -82,7 +82,21 @@ namespace Forms
             }
         }
 
-        /*
+		private void trackBarDB_MouseUp(object sender, MouseEventArgs e)
+		{
+			if (trackBarDB.Value > 50)
+			{
+				trackBarDB.Value = 100;
+				Program.ChangeDB(false);
+			}
+			else
+			{
+				trackBarDB.Value = 0;
+				Program.ChangeDB(true);
+			}
+		}
+
+		/*
         private Abstractions bd = new Implementation();
         private void button1_Click(object sender, EventArgs e)
         {
diff --git a/SUBD_Car_rent/Forms/Program.cs b/SUBD_Car_rent/Forms/Program.cs
index 71e88f2..782e53c 100644
--- a/SUBD_Car_rent/Forms/Program.cs
+++ b/SUBD_Car_rent/Forms/Program.cs
@@ -7,10 +7,31 @@ namespace Forms
     {
         private static ServiceProvider? _serviceProvider;
         public static ServiceProvider? ServiceProvider => _serviceProvider;
-        /// <summary>
-        ///  The main entry point for the application.
-        /// </summary>
-        [STAThread]
+
+		private static bool isPostgreSQL = true;
+
+		private static void ConfigureServices(ServiceCollection services)
+		{
+			if (isPostgreSQL)
+			{
+				services.AddTransient<Abstractions, ImplementationPostgres>();
+			}
+			else
+			{
+				services.AddTransient<Abstractions, ImplementationMongoDB>();
+			}
+			services.AddTransient<FormMain>();
+			services.AddTransient<FormBranch>();
+			services.AddTransient<FormCar>();
+			services.AddTransient<FormCarModel>();
+			services.AddTransient<FormClient>();
+			services.AddTransient<FormRental>();
+		}
+
+		/// <summary>
+		///  The main entry point for the application.
+		/// </summary>
+		[STAThread]
         static void Main()
         {
             // To customize application configuration such as set high DPI settings or default font,
@@ -21,15 +42,22 @@ namespace Forms
             _serviceProvider = services.BuildServiceProvider();
             Application.Run(_serviceProvider.GetRequiredService<FormMain>());
         }
-        private static void ConfigureServices(ServiceCollection services)
-        {
-            services.AddTransient<Abstractions, Implementation>();
-            services.AddTransient<FormMain>();
-            services.AddTransient<FormBranch>();
-            services.AddTransient<FormCar>();
-            services.AddTransient<FormCarModel>();
-            services.AddTransient<FormClient>();
-            services.AddTransient<FormRental>();
-        }
-    }
+
+        public static void ChangeDB()
+		{
+			isPostgreSQL = !isPostgreSQL;
+			var services = new ServiceCollection();
+			ConfigureServices(services);
+			_serviceProvider = services.BuildServiceProvider();
+		}
+		public static void ChangeDB(bool newIsPostrgeSQL)
+		{
+			if (newIsPostrgeSQL == isPostgreSQL)
+				return;
+			isPostgreSQL = newIsPostrgeSQL;
+			var services = new ServiceCollection();
+			ConfigureServices(services);
+			_serviceProvider = services.BuildServiceProvider();
+		}
+	}
 }
\ No newline at end of file