In a application of mine that is developed in C# I have the following code:

byte[] resb = new byte[Buffer.ByteLength(blockAr) + Buffer.ByteLength(previous)]; Array.Copy(blockAr, 0, resb,0, blockAr.Length); Array.Copy(previous, 0, resb, blockAr.Length, previous.Length);

It's a very simple code to concatenate two byte arrays.

The problem is that in some particular situation that I don't know I have that exception:

ArgumentOutOfRangeException: sourceIndex is less than the lower bound of the first dimension of sourceArray.

I cannot see any of strange in my code and I am not able to reproduce the exception.

Could anyone help me to identify the problem?

thanks