ASP.NET Error Fix | Login failed for user sa | An unhandled exception occured

Fix for Error:
Server Error in '/' Application.
Login failed for user 'sa'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

ASP.NET Authentication Tutorial:
Authentication in ASP.NET MVC | Login...

Exception Details: System.Data.SqlClient.SqlException: Login failed for user 'sa'.

Source Error:
entity.SaveChanges();

More ASP.NET MVC Tutorials:
ASP.NET MVC Tutorials

Software Used in This Tutorial:
-Visual Studios 2019 Community Edition

Project Description:
-Based on ASP.NET Web Application (.NET Framework) : MVC Template

• #science_technology
• #how_to_fix_login_failed_for_user
• #login_failed_for_user_sa_fix
• #aspnet_mvc_error_login_failed_for_user_sa
• #entity_framework_error_not_saving_changes
• #asp_login_failed_error