How To Update Entity In Entity Framework In Visual Studio
First of all double click on the edmx file on your Solution.
This will open Entity Framework Diagram view.

Right Click inside Entity Framework Diagram view and select Model Browser.

On the Model Browser, you can see the Tables, Stored Procedures, and other database entities.
For updating right click on the edmx icon on Model Browser and select Update Model From Database.

This will open a new window where you can see three tabs. Add, Refresh, Delete.

If you would like to add a newly created entity then select Add.
If you would like to refresh already present entity then select Refresh.
If you would like to delete an entity then select Delete.
If everything is done please click on the Finish Button.
This will update the entity framework in Visual studio.