Bind drop down list using entity framework in ASP.NET Core using Visual studio 2022 | Part 7

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Bind drop down list using entity framework in ASP.NET Core razor page using Visual studio 2022:
Requirement: SQL server 2012, Visual studio 2022
SQL table:
CREATE TABLE Department (
department_id INT PRIMARY KEY,
department_name NVARCHAR(100) NOT NULL,
department_location NVARCHAR(100),
display_order int
);

Steps:1
Installation Required through NuGet packages
1) Microsoft.EntityFrameworkCore.SqlServer
3) Microsoft.Extensions.Configuration


Steps:2
Create a folder Models then Create a Class through the command line of Nuget Package:
Scaffold-DbContext "Server=DESKTOP-HSSNFCU;Database=Sample_db;Trusted_Connection=True; TrustServerCertificate=true;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models
-force
Steps:3
// add db context to the container
builder.Services.AddDbContext less sign SampleDbContext grater sign ();

Steps:4) Need to added the Razor pages:

View Model Class:
public class DeparmentViewModelcs
{
// Property to hold the selected department ID
public int SelectedDeparmentId { get; set; }
// List of departments to populate the dropdown
public List less sign SelectListItem greater sign ? departments { get; set; }

}
“asp-for” is a tag helper used in Razor syntax to bind an HTML element to a model property, ensuring that the form's data is properly passed to the server.
The asp-for tag helper helps ensure the HTML elements are linked correctly to the model properties, and it also provides built-in features such as automatic validation and formatting.

“asp-items” is another tag helper used in ASP.NET Core with Razor views, specifically for binding a collection of items to a select dropdown (select) element.
It dynamically generates the option elements for a dropdown based on a list of items, typically from a model or controller.
SelectListItem:
Represents an item in a SelectList or MultiSelectList.
This class is typically rendered as an HTML option element with the specified attribute values.
The SelectListItem is used to represent an item in a dropdown list (select element) or a list of options for a user to choose from.

Understand the below sample db context:
private readonly SampleDbContext _context;
private: The field is private, meaning it is only accessible within the class where it is defined.
readonly: This keyword means the field can only be assigned a value once, typically in the constructor, and cannot be changed afterward. This is useful when you want to ensure that the context is immutable throughout the class lifecycle after it is initialized.
SampleDbContext: This refers to your Entity Framework Core DbContext class.
A DbContext is used to interact with the database. It represents a session with the database, providing methods for querying and saving data.
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