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double[,] A = new double[10, 10];
for (int i = 0; i < 10; i++)
{
for (int j = 0; j < 10; j++)
{
A[i, j] = j;
}
}
double[,] C = new double[2, 2];
Array.ConstrainedCopy(A, 0, C, 0, 2);
for (int i = 0; i < 2; i++)
{
for (int j = 0; j < 2; j++)
{
Console.WriteLine(C[i, j]);
}
}