изменила и добавила модели данных - убрала общий айдишник

BeautySalon/BeautySalon/FormMain.Designer.cs

@@ -28,12 +28,43 @@
         /// </summary>
         private void InitializeComponent()
         {
-            this.components = new System.ComponentModel.Container();
-            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
-            this.ClientSize = new System.Drawing.Size(800, 450);
-            this.Text = "FormMain";
+            comboBoxService = new ComboBox();
+            label1 = new Label();
+            SuspendLayout();
+            // 
+            // comboBoxService
+            // 
+            comboBoxService.FormattingEnabled = true;
+            comboBoxService.Location = new Point(310, 209);
+            comboBoxService.Name = "comboBoxService";
+            comboBoxService.Size = new Size(227, 28);
+            comboBoxService.TabIndex = 0;
+            // 
+            // label1
+            // 
+            label1.AutoSize = true;
+            label1.Location = new Point(350, 253);
+            label1.Name = "label1";
+            label1.Size = new Size(124, 20);
+            label1.TabIndex = 1;
+            label1.Text = "Выберите услугу";
+            // 
+            // FormMain
+            // 
+            AutoScaleDimensions = new SizeF(8F, 20F);
+            AutoScaleMode = AutoScaleMode.Font;
+            ClientSize = new Size(817, 456);
+            Controls.Add(label1);
+            Controls.Add(comboBoxService);
+            Name = "FormMain";
+            Text = "FormMain";
+            ResumeLayout(false);
+            PerformLayout();
         }
 
         #endregion
+
+        private ComboBox comboBoxService;
+        private Label label1;
     }
 }

BeautySalon/BeautySalon/FormMain.resx

@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <root>
-  <!-- 
+  <!--
     Microsoft ResX Schema 
-    
+
     Version 2.0
-    
-    The primary goals of this format is to allow a simple XML format 
-    that is mostly human readable. The generation and parsing of the 
-    various data types are done through the TypeConverter classes 
+
+    The primary goals of this format is to allow a simple XML format
+    that is mostly human readable. The generation and parsing of the
+    various data types are done through the TypeConverter classes
     associated with the data types.
-    
+
     Example:
-    
+
     ... ado.net/XML headers & schema ...
     <resheader name="resmimetype">text/microsoft-resx</resheader>
     <resheader name="version">2.0</resheader>
@@ -26,36 +26,36 @@
         <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
         <comment>This is a comment</comment>
     </data>
-                
-    There are any number of "resheader" rows that contain simple 
+
+    There are any number of "resheader" rows that contain simple
     name/value pairs.
-    
-    Each data row contains a name, and value. The row also contains a 
-    type or mimetype. Type corresponds to a .NET class that support 
-    text/value conversion through the TypeConverter architecture. 
-    Classes that don't support this are serialized and stored with the 
+
+    Each data row contains a name, and value. The row also contains a
+    type or mimetype. Type corresponds to a .NET class that support
+    text/value conversion through the TypeConverter architecture.
+    Classes that don't support this are serialized and stored with the
     mimetype set.
-    
-    The mimetype is used for serialized objects, and tells the 
-    ResXResourceReader how to depersist the object. This is currently not 
+
+    The mimetype is used for serialized objects, and tells the
+    ResXResourceReader how to depersist the object. This is currently not
     extensible. For a given mimetype the value must be set accordingly:
-    
-    Note - application/x-microsoft.net.object.binary.base64 is the format 
-    that the ResXResourceWriter will generate, however the reader can 
+
+    Note - application/x-microsoft.net.object.binary.base64 is the format
+    that the ResXResourceWriter will generate, however the reader can
     read any of the formats listed below.
-    
+
     mimetype: application/x-microsoft.net.object.binary.base64
-    value   : The object must be serialized with 
+    value   : The object must be serialized with
             : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
             : and then encoded with base64 encoding.
     
     mimetype: application/x-microsoft.net.object.soap.base64
-    value   : The object must be serialized with 
+    value   : The object must be serialized with
             : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
             : and then encoded with base64 encoding.
 
     mimetype: application/x-microsoft.net.object.bytearray.base64
-    value   : The object must be serialized into a byte array 
+    value   : The object must be serialized into a byte array
             : using a System.ComponentModel.TypeConverter
             : and then encoded with base64 encoding.
     -->

BeautySalon/BeautySalonDBModels/ICheque.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeautySalonDBModels
+{
+    public interface ICheque
+    {
+        int ChequeId { get; }
+        int ClientId { get; }
+        string ReceptionId { get; }
+    }
+}

BeautySalon/BeautySalonDBModels/IClient.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeautySalonDBModels
+{
+    public interface IClient 
+    {
+        int ClientId { get; }
+        string FIO {  get; }
+        int Age { get; }
+    }
+}

BeautySalon/BeautySalonDBModels/IMaster.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeautySalonDBModels
+{
+    public interface IMaster 
+    {
+        int MasterId { get; }
+        int SpecialisationId { get; }
+        string FIO {  get; }
+    }
+}

BeautySalon/BeautySalonDBModels/IReception.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeautySalonDBModels
+{
+    public interface IReception 
+    {
+        int ReceptionId { get; }
+        int MasterId { get; }
+        int ServiceId { get; }
+        DateTime DateReception { get; }
+    }
+}

BeautySalon/BeautySalonDBModels/IService.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeautySalonDBModels
+{
+    public interface IService 
+    {
+        int ServiceId { get; }
+        string ServiceName { get; }
+        double Price { get; }
+        int SpecialisationId { get; }
+    }
+}

BeautySalon/BeautySalonDBModels/ISpecialisation.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeautySalonDBModels
+{
+    public interface ISpecialisation 
+    {
+        int SpecialisationId { get; }
+        string Name { get; }
+    }
+}