[csharp/matrix] Basic csharp mentoring notes for the matrix problem

[michalporeba]

The problem can be solve in a number of ways, and it is good to have the examples ready to guide the students.
The alternative solution with multidimensional tables gets unnecessarily complex quickly so is not included.

[michalporeba]

Hello, how can I help with reviews? Clearly there is problem with the flow. Is there somebody I could talk to perhaps about contributing to the content in C# track?

[IsaacG]

Hello, how can I help with reviews? Clearly there is problem with the flow. Is there somebody I could talk to perhaps about contributing to the content in C# track?

The Exercism forums is the place to discuss topics such as these.

[SleeplessByte]

@exercism/csharp can you quickly check so we can get this merged?

[SleeplessByte]

Suggested change

	Solution without Linq:
	```csharp
	Solution without Linq:
	```csharp

[SleeplessByte]

Suggested change

	Solution with Linq:
	```csharp
	Solution with Linq:
	```csharp

[SleeplessByte]

Suggested change

	### Common suggestions:
	*Good suggestions specific to this exercise. Good lessons that emerge from it.*
	### Common suggestions

[SleeplessByte]

Suggested change

	### Talking points:
	*Questions to challenge more advance learners with.*
	- The differences between multidimensional and jagged arrays in general and in C#.
	### Talking points
	- The differences between multidimensional and jagged arrays in general and in C#.

[SleeplessByte]

Suggested change

	In this case the data is dense so there are no memory efficiencies to talk about.
	However, the choice influeces the type of code we can write.
	- There are two problems: parsing of input and responding to queries.
	Both are relatively simple and there is no need for input checking.
	- The problem can be solved with iteration using loops and using Linq. What's the difference?
	Both the parsing and access to column data change.
	The change in parsing is more obvious between very imperative use of two loops vs more declarative expression using linq.
	In this case the data is dense so there are no memory efficiencies to talk about.
	However, the choice influences the type of code we can write.
	- There are two problems: parsing of input and responding to queries.
	Both are relatively simple and there is no need for input checking.
	- The problem can be solved with iteration using loops and using Linq.
	What's the difference?
	Both the parsing and access to column data change.
	The change in parsing is more obvious between very imperative use of two loops vs more declarative expression using Linq.