Надеюсь итог

ProjectCompanyFurniture/ProjectCompanyFurniture/Entities/Invoice.cs

@@ -19,7 +19,7 @@ public class Invoice
 
     public int SellingPrice { get; set; }
 
-    DateTime Data { get; set; }
+    public DateTime Date { get; set; }
 
     public IEnumerable<InvoiceProduct> Products
     {
@@ -37,7 +37,7 @@ public class Invoice
             AvailabilityOfPromotionalCode = availabilityOfPromotionalCode,
             DiscountPercentage = discountPercentage,
             SellingPrice = sellingPrice,
-            Data = DateTime.Now,
+            Date = DateTime.Now,
             Products = products
         };
     }

ProjectCompanyFurniture/ProjectCompanyFurniture/Entities/ProductMovement.cs

@@ -13,17 +13,17 @@ public class ProductMovement
 
     public int ProductID { get; private set; }
 
-    public Movement MovementProduct { get; private set; }
+    public Movement MovementType { get; private set; }
 
     public DateTime Date { get; private set; }
 
-    public static ProductMovement CreateOperation (int it, int productId, Movement movement)
+    public static ProductMovement CreateOperation (int it, int productId, Movement movementType)
     {
         return new ProductMovement
         {
             ID = it,
             ProductID = productId,
-            MovementProduct = movement,
+            MovementType = movementType,
             Date = DateTime.Now
         };
     }

ProjectCompanyFurniture/ProjectCompanyFurniture/Forms/FormInvoice.cs

@@ -24,12 +24,12 @@ namespace ProjectCompanyFurniture.Forms
                 throw new ArgumentNullException(nameof(invoiceRepository));
 
             comboBoxClient.DataSource = clientRepository.ReadClients();
-            comboBoxClient.DisplayMember = "FirstName";
-            comboBoxClient.ValueMember = "Id";
+            comboBoxClient.DisplayMember = "Name";
+            comboBoxClient.ValueMember = "ID";
 
             ColumnProduct.DataSource = productRepository.ReadProducts();
             ColumnProduct.DisplayMember = "Name";
-            ColumnProduct.ValueMember = "Id";
+            ColumnProduct.ValueMember = "ID";
         }
 
         private void ButtonSave_Click(object sender, EventArgs e)

ProjectCompanyFurniture/ProjectCompanyFurniture/Forms/FormProducts.cs

@@ -59,7 +59,7 @@ namespace ProjectCompanyFurniture.Forms
             }
             try
             {
-                var form = _container.Resolve<FormClient>();
+                var form = _container.Resolve<FormProduct>();
                 form.Id = findId;
                 form.ShowDialog();
                 LoadList();