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mediator is a tool that makes implementing the mediator pattern much easier it also allows us to conform more easily to the cqrs pattern now if i've already lost you never fear i'm going to briefly touch on what each of those patterns is why they're important and when we should use them or not use them then we'll see an example how of how to use mediator the tool in our projects in c sharp now this is the first video you've watched of mine my name is tim corey and it's my goal to make learning c-sharp easier i provide videos twice a week here on youtube to help you grow as a developer i also have a full set of training courses on iamtimcory.com encourage you to check out all the resources i have to offer now in this video as with most of my videos i'm going to create some source code if you like a copy of a source code use the link in the description below now let's start off with going to the whiteboard to talk about what is mediator what is cqrs and so on so let's start off with cqrs so cqrs stands for command query responsibility segregation all right which is quite the mouthful move that around and make it a little bigger so that's cqrs command query responsibility segregation and the idea is fairly simple so we have normal crud commands maybe familiar acronym crud which stands for create read update and delete this is how we deal with data well instead of having all of our crud all of our crud kind of together what we're going to do instead is we're going to segment it out into two different pieces and we're going to have our reads right here and our creates updates and deletes right there now what does that do for us by creating this this line here we can separately scale up this side or this side as necessary so there are some benefits here but there's also some added complexity in doing that we're essentially splitting our data access into two parts one part is all about getting data that's this right here the other part is all about updating data and this is most often used in larger applications and the reason why is because it adds complexity however it does give us some additional benefits like i said we can change the read to scale up or move to a different server or other things like that we can we can scale that up separately from our creates updates and deletes there create two different systems for doing this so there are some benefits to the command query responsibility segregation principle or pattern so let's now move on to let's get rid of this get rid of all of it you need to go away too there we go so now let's talk about our second pattern today and whoops there...