C# Programming (Intermediate) - Lecture 9: Unique Constraints in Databases, Entity Framework Sortin

Join Discord For Help : https://bit.ly/CodeInNetDiscord. Lecture 9/14 of Advanced/Intermediate C# Programming. If I have been of assistance to you and you would like to show your support for my work, please consider becoming a patron on ? https://www.patreon.com/SECourses

Source code repository of this Course:
https://github.com/FurkanGozukara/Introduction-to-Programming-2-2021

Playlist of C# #PROGRAMMING (Advanced/Intermediate) Full Course ?? (FREE) - 2023:
https://www.youtube.com/playlist?list=PLdCdTIJgqkdGHoXqOVInDRQ5WwYFmx27e

In Lecture 9:
* How to hide and display a tab according to the authority of the logged-in user
* How to load a ready CSV dataset into the database with Entity Framework
* How to utilize task.factory to prevent user interface freeze
* How to update label from sub-threads, sub-tasks with dispatcher
* How to add uniqueness constraint to a database table with defining a unique index
* How to achieve unique adding to the database when using entity framework
* How to add sorting feature to your datagrid display when using entity framework for automatic display, insert, update, delete
* How to bind all elements of an enumeration to a combobox
* How to display description of enum items in the combobox
* How to get selected enumeration of itemssource bound combobox

User Authorization-Based Tab Visibility
One key aspect of an effective user interface design involves dynamically tailoring content according to the authority level of a logged-in user. This concept can be implemented using many different technologies. One approach could be hiding or displaying tabs according to the user's assigned roles or privileges. By doing so, we ensure that users only interact with the content and resources within their access rights. Implementing this approach would typically involve a blend of front-end and back-end development strategies, including user authentication, role-based authorization, and dynamic UI updates.

Importing CSV Datasets into a Database with Entity Framework
Entity Framework (EF) is a powerful Object-Relational Mapping (ORM) tool for .NET applications that abstracts the underlying database system, providing a simpler and more intuitive way to handle data. It can even be used to load CSV datasets into a database. The general process involves reading the CSV file, parsing the data, creating corresponding entities, and then using EF's DbContext and DbSet classes to save these entities into the database.

UI Responsiveness: Task.Factory to the Rescue
In modern application development, user experience plays a crucial role. A responsive UI, one that doesn't freeze or become unresponsive, is paramount. This is where Task.Factory comes in handy. By utilizing Task.Factory in .NET, long-running operations can be offloaded to a background thread, keeping the main UI thread free and responsive. Task.Factory creates and starts a task in one method call, returning a Task that can be monitored and interacted with.

Thread-Safe UI Updates using Dispatcher
Updating UI elements from non-UI threads can be a challenging task due to thread-safety issues. One common situation is when we have to update a label from a sub-thread or task. A technique commonly used in this scenario is a Dispatcher, which marshals the execution of a block of code to the UI thread, ensuring that UI elements are updated in a thread-safe manner.

Enforcing Uniqueness: Adding Constraints and Unique Indexes
In the world of databases, ensuring data integrity and avoiding duplication are often high on the priority list. One way to ensure that a field remains unique across all entries in a table is to define a unique index. A unique index acts as a constraint, preventing the insertion of duplicate values within the column(s) it covers.

Unique Additions to the Database with Entity Framework
Entity Framework (EF) makes data operations easier, but ensuring uniqueness during data insertion requires some additional steps. To maintain uniqueness while using EF, you'd generally check if an entity with the same unique attribute(s) exists before trying to insert a new one. This can be done using LINQ queries, which can seamlessly integrate with EF's DbContext to provide a smooth workflow.

Adding Sorting Features to DataGrids with Entity Framework
Data presentation is as crucial as data storage and retrieval. A feature often desired when displaying data in a DataGrid is sorting. With Entity Framework, you can easily implement automatic data display, insertion, update, and deletion. Adding a sorting feature can be achieved by handling the appropriate events and using LINQ to Entities to order the data according to the user's preferences.

Binding Enumeration Elements to a ComboBox
Enumerations, or Enums, are a powerful tool to represent a collection of related constants in a programming language. In many instances, you might need to display all elements of an enumeration in a ComboBox for user selection.