OTC-586 Implement "using" for all disposable elements (streams, connections, writers)

[malinowskikam]

https://openimis.atlassian.net/browse/OTC-586

Changes:

• Updated SQL helpers to handle connections with using
• Updated XML serializations to handle writers and streams with using
• Updated WebRequests to handle streams with using
• Added LoggerFactory to various components
• Added log calls to various error handlers
• Refactored GepgFileLogger.cs
• Updated missing awaits in async tasks
• Updated missing override operators

[delcroip]

There is lots of changes, I guess I need someone more experienced in c# to review and maybe to test.

I would like to have some test on the sit server.

@hirensoni913 can you see what you can do ?

[hirensoni913]

Why the Try/Catch block is removed? Can't we log the error rather than removing it?

[malinowskikam]

Because this block just rethrowed the sql exception and replaced any other exception with empty generic exception, crashing the endpoint and hiding the cause. Without it the escaped exception will be caught and logged

[hirensoni913]

@malinowskikam can you add the proper exception handling in the catch blocks?

[hirensoni913]

@malinowskikam Can you also look in to the "GepgFileLogger" file. This file contains lots of IO operations. We need to use the using block in it + log the exceptions in proper way

[malinowskikam]

@hirensoni913 I updated the empty error handlers in the payment controller and logic. Also I refactored GepgFileLogger