MyClass[][,][,] abc = new MyClass[10][,][,];
for (int i = 0; i < abc.Length; i++)
{
abc[i] = new MyClass[20, 30][,];
for (int j = 0; j < abc[i].GetLength(0); j++)
{
for (int k = 0; k < abc[i].GetLength(1); k++)
{
abc[i][j, k] = new MyClass[40, 50];
}
}
}
