How do I find the size of a 2D array? [duplicate]

If I declare this array...

string[,] a = {
                  {"0", "1", "2"},
                  {"0", "1", "2"},
                  {"0", "1", "2"},
                  {"0", "1", "2"},
              };

Then I can measure the length with

a.Length

which is 12. How do I measure the dimension of the arrays within? If I try...

a[0].Length

I get Wrong number of indices inside []; expected 2. What gives?

You want the GetLength() method of your array:

a.GetLength(0);

http://msdn.microsoft.com/en-us/library/system.array.getlength.aspx

Use Array.Rank to get number of dimensions and then use Array.GetLength(int dimension) to get the length of a specific dimension.

Use System.Array.GetLength(int dimension).