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+# Concurrency Check in ABP Based Applications
+
+In this article, we'll create a basic application to demonstrate how "Concurrency Check/Control" can be done in an ABP based application.
+
+## Creating the Solution
+
+For this article, we can create a simple BookStore application and perform CRUD operations. 
+
+> To keep the article simple and shor, we'll only add **Book** entity and ignore the **Author** part.
+
+We can create a new startup template with EF Core as a database provider and MVC for the UI Framework.
+
+> If you already have a project, you don't need to create a new startup template, you can directly implement the following steps to your project. So you can skip this section.
+
+We can create a new startup template by using the [ABP CLI](https://docs.abp.io/en/abp/latest/CLI).
+
+```bash
+abp new Acme.BookStore -t app -csf
+```
+
+After running the above command, our project boilerplate will be downloaded. Then we can open the solution and start to the development.
+
+## Starting the Development
+
+Let's start with defining our entities.
+
+### Creating Entitites
+
+Create a `Book.cs` (/Books/Book.cs) class in the `.Domain` layer:
+
+```csharp
+public class Book : AuditedAggregateRoot<Guid>
+{
+    public string Name { get; set; }
+
+    public BookType Type { get; set; }
+
+    public DateTime PublishDate { get; set; }
+
+    public float Price { get; set; }
+}
+```
+
+* To enable **Concurrency Check** for our entities, our entities should implement the `IHasConcurrencyStamp` interface, directly or indirectly.
+
+* [Aggregate Root](https://docs.abp.io/en/abp/5.2/Entities#aggregateroot-class) entity classes already implement the `IHasConcurrencyStamp` interface, so if we inherit our entities from one of these entity classes we don't need to manually implement the `IHasConcurrencyStamp` interface.
+
+* And we've derieved the `Book` entity from `AuditedAggregateRoot<TKey>` here, so we don't need to implement `IHasConcurrencyStamp` interface because `AuditedAggregateRoot` class is already implement the `IHasConcurrencyStamp` interface.
+
+> You can read more details from the [Concurreny Check](https://docs.abp.io/en/abp/5.2/Concurrency-Check) documentation.
+
+Then, create a `BookType` (/Books/BookType.cs) enum in the `.Domain.Shared` layer:
+
+```csharp
+public enum BookType
+{
+    Undefined,
+    Adventure,
+    Biography,
+    Dystopia,
+    Fantastic,
+    Horror,
+    Science,
+    ScienceFiction,
+    Poetry
+}
+```
+
+### Database Integration
+
+Open the `BookStoreDbContext` (/EntityFrameworkCore/BookStoreDbContext.cs) class in the `*.EntityFrameworkCore` project and add the following `DbSet<Book>` statement:
+
+```csharp
+namespace Acme.BookStore.EntityFrameworkCore;
+
+[ReplaceDbContext(typeof(IIdentityDbContext))]
+[ReplaceDbContext(typeof(ITenantManagementDbContext))]
+[ConnectionStringName("Default")]
+public class BookStoreDbContext :
+    AbpDbContext<BookStoreDbContext>,
+    IIdentityDbContext,
+    ITenantManagementDbContext
+{
+    //Entities from the modules
+
+    public DbSet<Book> Books { get; set; } //add this line
+}
+```
+
+Then we can navigate to the `OnModelCreating` method in the same class and configure our tables/entities:
+
+```csharp
+protected override void OnModelCreating(ModelBuilder builder)
+{
+    base.OnModelCreating(builder);
+
+    /* Include modules to your migration db context */
+
+    builder.ConfigurePermissionManagement();
+    ...
+
+    //* Configure your own tables/entities inside here */
+
+    builder.Entity<Book>(b =>
+    {
+        b.ToTable(BookStoreConsts.DbTablePrefix + "Books",
+            BookStoreConsts.DbSchema);
+        b.ConfigureByConvention(); //auto configure for the base class props
+        b.Property(x => x.Name).IsRequired().HasMaxLength(128);
+    });
+}
+```
+
+After the mapping configurations, we can create a new migration and apply changes to the database.
+
+To do this, open your command line terminal in the directory of the `EntityFrameworkCore` project and run the below command:
+
+```bash
+dotnet ef migrations add Added_Books
+```
+
+After this command a new migration will be generated and then we can run the `*.DbMigrator` project to apply the last changes to the database such as creating a new table named `Books` according to the lastly created migration.
+
+### Defining DTOs and Application Service Interfaces
+
+We can start to define the use cases of the application.
+
+Create the DTO classes (under **Books** folder) in the `Application.Contracts` project:
+
+* **BookDto.cs**
+
+```csharp
+public class BookDto : AuditedEntityDto<Guid>, IHasConcurrencyStamp
+{
+    public string Name { get; set; }
+
+    public BookType Type { get; set; }
+
+    public DateTime PublishDate { get; set; }
+
+    public float Price { get; set; }
+    
+    public string ConcurrencyStamp { get; set; }
+}
+```
+
+* `AuditedEntityDto<TKey>` class is not implemented from the `IHasConcurrencyStamp` interface, so for **BookDto** class we need to implement the `IHasConcurrencyStamp`.
+
+* This is important, because we need to return books with their **ConcurrencyStamp** value.
+
+* **CreateBookDto.cs**
+
+```csharp
+public class CreateBookDto
+{
+    [Required]
+    [StringLength(128)]
+    public string Name { get; set; }
+
+    [Required]
+    public BookType Type { get; set; } = BookType.Undefined;
+
+    [Required]
+    [DataType(DataType.Date)]
+    public DateTime PublishDate { get; set; } = DateTime.Now;
+
+    [Required]
+    public float Price { get; set; }
+}
+```
+
+* **UpdateBookDto.cs**
+
+```csharp
+public class UpdateBookDto : IHasConcurrencyStamp
+{
+    [Required]
+    [StringLength(128)]
+    public string Name { get; set; }
+
+    [Required]
+    public BookType Type { get; set; } = BookType.Undefined;
+
+    [Required]
+    [DataType(DataType.Date)]
+    public DateTime PublishDate { get; set; } = DateTime.Now;
+
+    [Required]
+    public float Price { get; set; }
+
+    public string ConcurrencyStamp { get; set; }
+}
+```
+
+* Here, we've also implemented the `IHasConcurrencyStamp` interface for the **UpdateBookDto** class.
+
+* We will use this value while updating an existing book. ABP Framework will compare the current book's **ConcurrencyStamp** value with the provided one, if values are matched, this means everything is as it is supposed to be and will update the record. 
+
+* If values are mismatched, then it means record that we're trying to update is already updated by an other user and we need to get the latest changes to be able to make changes on it.
+
+* Also, in that case, `AbpDbConcurrencyException` will be thrown by the ABP Framework and we can either handle this exception manually or let the ABP Framework handle it behalf of use and shows a user-friendly error message as in the image below.
+
+![](./optimistic-concurrency.png)
+
+Create a new `IBookAppService` (/Books/IBookAppService.cs) interface in the `Application.Contracts` project:
+
+```csharp
+public interface IBookAppService :
+    ICrudAppService<BookDto, Guid, PagedAndSortedResultRequestDto, CreateBookDto, UpdateBookDto> 
+{
+}
+```
+* We've implemented the `ICrudAppService` here, because we just need to perform CRUD operations and this interface help us to define common CRUD operation methods.
+
+### Application Service Implementations
+
+Create a `BookAppService` (/Books/BookAppService.cs) class inside the `*.Application` project and implement the application service methods, as shown below:
+
+```csharp
+public class BookAppService :
+    CrudAppService<Book, BookDto, Guid, PagedAndSortedResultRequestDto, CreateBookDto, UpdateBookDto>, 
+    IBookAppService 
+{
+    public BookAppService(IRepository<Book, Guid> repository)
+        : base(repository)
+    {
+    }
+    
+    public override async Task<BookDto> UpdateAsync(Guid id, UpdateBookDto input)
+    {
+        var book = await Repository.GetAsync(id);
+        
+        book.Name = input.Name;
+        book.Price = input.Price;
+        book.Type = input.Type;
+        book.PublishDate = input.PublishDate;
+        
+        book.SetConcurrencyStampIfNotNull(input.ConcurrencyStamp);
+
+        var updatedBook = await Repository.UpdateAsync(book);
+        return ObjectMapper.Map<Book, BookDto>(updatedBook);
+    }
+}
+```
+
+* He've used the `CrudAppService` base class. This class implements the all common CRUD operations and if we want to change a method, we can simply override the method and change it by our needs.
+
+> Normally, you don't need to override the `UpdateAsync` method to do **Concurrency Check**. I wanted to override this method to show what we need to do for **Concurrency Check**.
+
+* We can look closer to the `UpdateAsync` method here, because as we've mentioned earlier we need to pass the provided **ConcurrencyStamp** value to be able to do **Concurrency Check/Control** to our entity while updating. We've used the `SetConcurrencyStampIfNotNull` extension method to set the **ConcurrencyStamp** value to our entity and update the record. 
+
+* In that point, if the given record already updated by any other user, **ConcurrencyStamp** mismatch will occur and `AbpDbConcurrencyException` will be thrown and thanks to **Concurrency Check** system of ABP, data-consistency will be provided and the current record won't be overrided.
+
+* And if the values are matched, the record will be updated successfully.
+
+After implementing the application service methods, we can do the related mapping configurations, so open the `BookStoreApplicationAutoMapperProfile.cs` and update the content as below:
+
+```csharp
+public class BookStoreApplicationAutoMapperProfile : Profile
+{
+    public BookStoreApplicationAutoMapperProfile()
+    {
+        CreateMap<Book, BookDto>();
+        CreateMap<CreateBookDto, Book>();
+    }
+}
+```
+
+### User Interface
+
+So far, we've applied the all neccessary steps for the **Concurrency Check** system, let's see it in the action.
+
+Create a razor page in the `.Web` layer named `Index` (**/Pages/Books/Index.cshtml**), open this file and replace the content with the following code block:
+
+```html
+@page
+@using Acme.BookStore.Localization
+@using Microsoft.Extensions.Localization
+@model Acme.BookStore.Web.Pages.Books.Index
+
+@section scripts
+{
+    <abp-script src="/Pages/Books/Index.js" />
+}
+
+<abp-card>
+    <abp-card-header>
+        <abp-row>
+            <abp-column size-md="_6">
+                <abp-card-title>Books</abp-card-title>
+            </abp-column>
+            <abp-column size-md="_6" class="text-end">
+                <abp-button id="NewBookButton"
+                            text="New Book"
+                            icon="plus"
+                            button-type="Primary"/>
+            </abp-column>
+        </abp-row>
+    </abp-card-header>
+    <abp-card-body>
+        <abp-table striped-rows="true" id="BooksTable"></abp-table>
+    </abp-card-body>
+</abp-card>
+```
+
+* We've defined a table and "New Book" button inside a card element here, we'll fill the table with our book records in the next step by using the **Datatables** library.
+
+Create a `Index.js` (**/Pages/Books/Index.js**) file and add the following code block:
+
+```js
+$(function () {
+    var l = abp.localization.getResource('BookStore');
+    var createModal = new abp.ModalManager(abp.appPath + 'Books/CreateModal');
+    var editModal = new abp.ModalManager(abp.appPath + 'Books/EditModal');
+
+    var dataTable = $('#BooksTable').DataTable(
+        abp.libs.datatables.normalizeConfiguration({
+            serverSide: true,
+            paging: true,
+            order: [[1, "asc"]],
+            searching: false,
+            scrollX: true,
+            ajax: abp.libs.datatables.createAjax(acme.bookStore.books.book.getList),
+            columnDefs: [
+                {
+                    title: l('Actions'),
+                    rowAction: {
+                        items:
+                            [
+                                {
+                                    text: l('Edit'),
+                                    action: function (data) {
+                                        editModal.open({ id: data.record.id });
+                                    }
+                                }
+                            ]
+                    }
+                },
+                {
+                    title: l('Name'),
+                    data: "name"
+                },
+                {
+                    title: l('Type'),
+                    data: "type",
+                    render: function (data) {
+                        return l('Enum:BookType:' + data);
+                    }
+                },
+                {
+                    title: l('PublishDate'),
+                    data: "publishDate",
+                    render: function (data) {
+                        return luxon
+                            .DateTime
+                            .fromISO(data, {
+                                locale: abp.localization.currentCulture.name
+                            }).toLocaleString();
+                    }
+                },
+                {
+                    title: l('Price'),
+                    data: "price"
+                },
+                {
+                    title: l('CreationTime'), 
+                    data: "creationTime",
+                    render: function (data) {
+                        return luxon
+                            .DateTime
+                            .fromISO(data, {
+                                locale: abp.localization.currentCulture.name
+                            }).toLocaleString(luxon.DateTime.DATETIME_SHORT);
+                    }
+                }
+            ]
+        })
+    );
+
+    createModal.onResult(function () {
+        dataTable.ajax.reload();
+    });
+
+    editModal.onResult(function () {
+        dataTable.ajax.reload();
+    });
+
+    $('#NewBookButton').click(function (e) {
+        e.preventDefault();
+        createModal.open();
+    });
+});
+```
+
+* We've used the [Datatables](https://datatables.net/) to list our books.
+
+* Also defined **create** and **update** modals by using [ABP Modal Manager](https://docs.abp.io/en/abp/latest/UI/AspNetCore/Modals#modalmanager-reference), but we didn't create them yet, so let's create the modals.
+
+First, create **CreateModal** razor page and update the **CreateModal.cshtml** and **CreateModal.cshtml.cs** files as below:
+
+* **CreateModal.cshtml**
+
+```html
+@page
+@using Acme.BookStore.Web.Pages.Books
+@using Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Modal
+@model CreateModalModel
+@{
+    Layout = null;
+}
+<abp-dynamic-form abp-model="Book" asp-page="/Books/CreateModal">
+    <abp-modal>
+        <abp-modal-header title="New Book"></abp-modal-header>
+        <abp-modal-body>
+            <abp-form-content />
+        </abp-modal-body>
+        <abp-modal-footer buttons="@(AbpModalButtons.Cancel|AbpModalButtons.Save)"></abp-modal-footer>
+    </abp-modal>
+</abp-dynamic-form>
+```
+
+* We've used `abp-dynamic-form` tag-helper and pass it a `Book` model, this tag helper will simply create form contents (inputs, select boxes etc.) behalf of us.
+
+* **CreateModal.cshtml.cs**
+
+```csharp
+using System.Threading.Tasks;
+using Acme.BookStore.Books;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Acme.BookStore.Web.Pages.Books;
+
+public class CreateModalModel : BookStorePageModel
+{
+    [BindProperty]
+    public CreateBookDto Book { get; set; }
+
+    private readonly IBookAppService _bookAppService;
+
+    public CreateModalModel(IBookAppService bookAppService)
+    {
+        _bookAppService = bookAppService;
+    }
+
+    public void OnGet()
+    {
+        Book = new CreateBookDto();
+    }
+
+    public async Task<IActionResult> OnPostAsync()
+    {
+        await _bookAppService.CreateAsync(Book);
+        return NoContent();
+    }
+}
+```
+
+* In this file, we simply define **CreateBookDto** as bind property and we'll use this classes' properties in the form. Thanks to the `abp-dynamic-form` tag-helper we don't need to define all of this form elements one by one, it will generate behalf of us.
+
+We can create **EditModal** razor page and update the **EditModal.cshtml** and **EditModal.cshtml.cs** files as below:
+
+* **EditModal.cshtml**
+
+```html
+@page
+@using Acme.BookStore.Web.Pages.Books
+@using Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Modal
+@model EditModalModel
+@{
+    Layout = null;
+}
+<form asp-page="/Books/EditModal">
+    <abp-modal>
+        <abp-modal-header title="Update"></abp-modal-header>
+        <abp-modal-body>
+            <abp-input asp-for="Id"/>
+            <abp-input asp-for="Book.Name"/>
+            <abp-input asp-for="Book.Price"/>
+            <abp-select asp-for="Book.Type"/>
+            <abp-input asp-for="Book.PublishDate"/>
+            <abp-input asp-for="Book.ConcurrencyStamp" type="hidden"/>
+        </abp-modal-body>
+        <abp-modal-footer buttons="@(AbpModalButtons.Cancel|AbpModalButtons.Save)"></abp-modal-footer>
+    </abp-modal>
+</form>
+```
+
+* Here, we didn't use the `abp-dynamic-form` tag-helper and add all neccessary form elements to our form one by one.
+
+* As you may notice, we've set input type as **hidden** for the **ConcurrencyStamp** input, because end-user should not see this value.
+
+> Instead of doing it like that, we could create a view model class and use the `[HiddenInput]` data attribute for the **ConcurrencyStamp** property and use the `abp-dynamic-form` tag-helper. But to simplify the article I didn't want to do that, if you want you can create a view model and define the neccessary data attributes for properties.
+
+* **EditModal.cshtml.cs**
+
+```csharp
+public class EditModalModel : BookStorePageModel
+{
+    [HiddenInput]
+    [BindProperty(SupportsGet = true)]
+    public Guid Id { get; set; }
+
+    [BindProperty]
+    public UpdateBookDto Book { get; set; }
+
+    private readonly IBookAppService _bookAppService;
+
+    public EditModalModel(IBookAppService bookAppService)
+    {
+        _bookAppService = bookAppService;
+    }
+
+    public async Task OnGetAsync()
+    {
+        var bookDto = await _bookAppService.GetAsync(Id);
+        Book = ObjectMapper.Map<BookDto, UpdateBookDto>(bookDto);
+    }
+
+    public async Task<IActionResult> OnPostAsync()
+    {
+        await _bookAppService.UpdateAsync(Id, Book);
+        return NoContent();
+    }
+}
+```
+
+Lastly, we can define the neccessary mapping configurations and run the application to see results.
+
+Open the `BookStoreWebAutoMapperProfile.cs` and update the content as below:
+
+```csharp
+public class BookStoreWebAutoMapperProfile : Profile
+{
+    public BookStoreWebAutoMapperProfile()
+    {
+        CreateMap<BookDto, UpdateBookDto>();
+    }
+}
+```
+
+Then we can run the application, navigates to **/Books** endpoint and see the result.
+
+![](concurrency-mismatch.gif)
+
+* In the image above, we can see that multiple users open the edit model to change a record and try to update the relevant record independently of each other.
+
+* After the first user updated the record, the second user tries to update the same record without getting the last state of the record. And therefore `AbpDbConcurrencyException` is thrown because **ConcurrencyStamp** values are different from each other.
+
+* The second user should close and re-open the model to get the last state of the record and then he/she can make changes to the current record.
+
+
+Thanks for reading the article.
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