Is arr[][] allowed instead of arr[,] in C# ??

Answer 1

The syntax for declaration of a two dimensional array is arr[,] anything other than that is a syntax error.
arr[][] is used in C++ for the same purpose.
Something people should keep in mind is that in programming we have only one syntax for a specific job. There is no secondary syntax rule that you get to choose. This applies to all the programming languages.
At least that's what I have learned in years. I might be wrong.

Answer 2

@Rey Silva That's syntax for declaring Jagged arrays not two dimensional arrays.

Answer 3

arr[,] -> Rectangular array (rows and columns are defined)
arr[][] -> Jagged array (columns can be different in different rows)

Answer 4

Yes it is (int [][] myArrey = new into[2][];) and then (myArrey[0] = new int[3];)
(myArrey[1] = new int[3])

now you have 2 rows and each row has 3 columns

Answer 5

typo it is supposed to be ( int ) not (into)