Index out of range exception in 2D Array (C#) -

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char[,] map = new char[10, 20];         (int = 0; < map.getlength(0); i++)         {             (int j = 0; < map.getlength(1); j++)             {                 map[i, j] = '.';              }         }

i want make elements of map[i,j] point , when try run compiler says: index out of range exception. maybe it's stupid question had ask it.

see i in j-loop

for (int j = 0; j < map.getlength(1); j++)

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