Hi Vitaly,

take a look at "Buffer.BlockCopy"

Rainer

Using the same overload you've specified, it doesn't matter how long each
array is, as long as "DestArray" is at least "Length" in length, and the
difference between DestArray.Length and DestIndex is at least as long  as
"Length."

The length of the arrays should not cause any problems to Array.Copy; e.g.
the following copies the second 50 bytes of a 100 byte array into (roughly)
the middle of a 500 byte arraym then prints some of the contents to validate
this.

           byte[] source = new byte[100];
           for (int i = 0; i < 100; i++)
               source[i] = (byte) i;
           byte[] dest = new byte[500];
           Array.Copy(source, 50, dest, 200, 50); // source array, source
start-offset, destination array, destination start-offset, items to copy
           for (int i = 195; i < 255; i++)
               Console.WriteLine("{0}: {1}", i, dest[i]);

If you are going to copy the entire source array, source.CopyTo(dest,offset)
is an easier option - again, it doesn't need the arrays to be the same size,
as long as there is sufficient space in the destination.

Did I miss something in your question?

Marc