In Visual Studio you can enable and disabled the automatic #region code surround while implement interface. Well by default it’s set to off and which is mostly like by all developer. But if you want some change, and you want while implementing interface it should automatically surround by #region then you have to go to
Tools > Options > Text Editor > C# > Advanced.
By default it will be un-checked.
So when it’s unchecked, if you implement any interface you wont be able to find any #region surround with your implemented interface. This is now by default features.
Now, if you want some changes and want your interface to warp with #region automatically, just check the
“Surround Generated Code With #region”
Once the above settings set, you will find your while implementing a new interface your code block surrounding with #region with Interface name
Now, if you are implementing multiple interface with same settings you will find you have multiple #region surrounding with different interface.
Well, as I said, by default in Visual Studio it’s turned off, as most of the time we don’t want the automatic region snippet surrounding with interface name or we may need a single region tag for all the interface. So, it’s totally depends on you how you want to use it.