Master Detail CRUD Operations Using EF And ASPnet MVC 3 In C: Best Practices and Tips
apmarbuliIntroduction
CRUD stands for Create, Read, Update, and Delete. These are the basic operations that any web application needs to perform on data stored in a database. In this tutorial, you will learn how to implement CRUD functionality using two popular frameworks: Entity Framework (EF) and ASP.NET MVC 3.
Master Detail CRUD Operations Using EF And ASPnet MVC 3 In C
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Entity Framework is an object-relational mapper (ORM) that enables you to work with data as .NET objects without writing much SQL code. It supports various approaches to model your data, such as Code First, Database First, or Model First.
ASP.NET MVC 3 is a web development framework that follows the Model-View-Controller (MVC) pattern. It separates your application into three components: models that represent data, views that display data, and controllers that handle user interactions.
By combining these two frameworks, you can create web applications that are easy to maintain, test, and extend. You will use C# as your programming language and Razor as your view engine.
Prerequisites
To follow this tutorial, you will need:Visual Studio 2010 or later with ASP.NET MVC 3 installed.SQL Server Express or LocalDB with SQL Server Management Studio.Basic knowledge of C#, HTML, CSS, Razor, and LINQ.
You can download Visual Studio from here and SQL Server from here. You can learn more about C#, HTML, CSS, Razor, and LINQ from here, here, here, here, and here.
Creating the project
Setting up the database
The first step is to create a database and a table for storing products. You will use SQL Server Management Studio (SSMS) to do this.
Open SSMS and connect to your SQL Server instance. Right-click on Databases and select New Database. Give it a name (e.g., ProductDB) and click OK.
Right-click on Tables and select New Table. Add four columns: Id (int), Name (nvarchar(50)), Price (decimal(18,2)), and Category (nvarchar(50)). Make Id the primary key by right-clicking on it and selecting Set Primary Key. Save the table as Products.
How to implement CRUD functionality with the Entity Framework in ASP.NET MVC[^1^]
Master-Detail CRUD operation using Entity Framework (Code First) and ASP.Net MVC 3[^2^]
CRUD code customization for controllers and views in ASP.NET MVC with EF Core[^3^]
Data passing using JSON and Ajax in ASP.Net MVC 3 and Entity Framework[^2^]
DataTables manipulation for detail records in ASP.Net MVC 3 and Entity Framework[^2^]
ModelState validation and exception handling in ASP.Net MVC 3 and Entity Framework[^2^]
Create a Details page to display the contents of a collection in an HTML table[^1^]
Update the Create page to use a dropdown list for a navigation property[^1^]
Update the HttpPost Edit method to prevent overposting[^1^]
Update the Delete page to use a hidden form field[^1^]
Close database connections and dispose resources properly[^1^]
Handle transactions using the Entity Framework in ASP.NET MVC[^1^]
Scaffolding code generation for CRUD operations in ASP.NET MVC with EF Core[^3^]
Sorting, filtering, and paging with the Entity Framework in ASP.NET MVC[^1^]
Concurrency conflicts detection and resolution with the Entity Framework in ASP.NET MVC[^1^]
Inheritance mapping with the Entity Framework in ASP.NET MVC[^1^]
Advanced data scenarios with the Entity Framework in ASP.NET MVC[^1^]
Deploying an ASP.NET MVC application with SQL Server Compact using Visual Studio Web Deploy method[^1^]
Code First migrations and deployment with the Entity Framework in ASP.NET MVC[^1^]
Testing and debugging an ASP.NET MVC application with the Entity Framework[^1^]
How to create a master-detail form using ASP.NET Core Razor Pages and EF Core
How to use partial views to reduce code duplication in ASP.NET Core Razor Pages and EF Core
How to implement search functionality using ASP.NET Core Razor Pages and EF Core
How to add a new field to an entity class and migrate the database using EF Core tools
How to use data annotations and fluent API to configure EF Core model properties
How to use lazy loading, eager loading, and explicit loading to load related data with EF Core
How to handle many-to-many relationships using a join entity class with EF Core
How to use raw SQL queries and stored procedures with EF Core
How to use asynchronous programming with EF Core to improve performance and scalability
How to implement global query filters, query tags, and query types with EF Core
To insert some sample data into the table, right-click on it and select Edit Top 200 Rows. Enter some values for each column (e.g., Id = 1, Name = Laptop, Price = 999.99, Category = Electronics).
The following is the SQL script for creating the table and inserting some sample data: ```sql CREATE TABLE [dbo].[Products] ( [Id] INT IDENTITY (1, 1) NOT NULL, [Name] NVARCHAR (50) NOT NULL, [Price] DECIMAL (18, 2) NOT NULL, [Category] NVARCHAR (50) NOT NULL, PRIMARY KEY CLUSTERED ([Id] ASC) ); INSERT INTO [dbo].[Products] ([Name], [Price], [Category]) VALUES ('Laptop', 999.99,'Electronics'), ('Book', 19.99,'Books'), ('Shoes', 49.99,'Clothing'), ('Coffee', 4.99,'Beverages'); ```
Creating the model classes
The next step is to create model classes that represent the entities in your database. You will use EF Code First approach to do this.
Open Visual Studio and create a new ASP.NET MVC 3 Web Application project. Give it a name (e.g., ProductApp) and click OK.
Add a new folder named Models in your project. Right-click on it and select Add > Class. Name it Product.cs and click OK.
In Product.cs file, add four properties that match the columns in your Products table: Id (int), Name (string), Price (decimal), and Category (string). You can also add some data annotations attributes to specify validation rules or display names for your properties.
The following is the code for Product.cs file: ```csharp using System.ComponentModel.DataAnnotations; namespace ProductApp.Models public class Product public int Id get; set; [Required] [StringLength(50)] public string Name get; set; [Required] [Range(0.01,double.MaxValue)] [DisplayFormat(DataFormatString = "0:C")] public decimal Price get; set; [Required] [StringLength(50)] public string Category get; set; ```
You can also use fluent API instead of data annotations attributes to configure your model class. To do this, you need to override a method called OnModelCreating in your context class (which you will create in the next section). For example: ```csharp protected override void OnModelCreating(DbModelBuilder modelBuilder) modelBuilder.Entity() .Property(p => p.Name) .IsRequired() .HasMaxLength(50); modelBuilder.Entity() .Property(p => p.Price) .IsRequired() .HasPrecision(18,2); modelBuilder.Entity() .Property(p => p.Category) .IsRequired() .HasMaxLength(50); ```
Creating the context class
The final step is to create a context class that inherits from DbContext and manages the connection to the database. Show the code for creating a DbSet property for products and overriding the OnModelCreating method to specify the connection string.
The following is the code for creating a context class named ProductContext.cs: ```csharp using System.Data.Entity; using System.Data.Entity.ModelConfiguration.Conventions; namespace ProductApp.Models public class ProductContext : DbContext public ProductContext() : base("ProductContext") public DbSet Products get; set; protected override void OnModelCreating(DbModelBuilder modelBuilder) modelBuilder.Conventions.Remove(); ``` The base constructor takes a connection string name as a parameter. You will add this connection string to your Web.config file in the next section. The DbSet property represents a collection of products that can be queried or