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byte[] buffer = new byte[1024*16];
long offset = 0;
int read;
using(MemoryStream stream = new MemoryStream(8192))
{
while((read = reader.GetBytes(col, offset, buffer, 0, buffer.Length)) > 0) {
offset += read;
stream.Write(buffer, 0, read);
}
buffer = stream.ToArray();
}
byte[] buffer = (byte[])reader[col];