Buffer.BlockCopy does not work more than one time

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C#

SQL

File-Upload

Hi guys

I have a big problem. I have a class that each time it receives buffer and it should append to a bigger byte array but it do the block copy only the first time, and then it does not copy anything

This is my code:

public Boolean WriteBlobsToDB(byte[] buffer, int offset, int fileSize, string fileName, string fileType, string user, int count, int NChunks, string md5Src,int id)
{
    bool ret = false;
    int l = buffer.Length; // The buffer length is almost 2 MB
    var allData = new byte[fileSize];
    int offst = count * offset; // count is 0 the first timethen each time a new buffer comes, the value of count in count++

    Buffer.BlockCopy(buffer, 0, allData, offst, fileSize);
    if (count == NChunks-1 ) // NChunks is the number of how many time the buffer would be passed here
    {               // the meaning of this if is that, when all the buffer of a file is passed then move to the database and upload the table
        File_List wfl = new File_List();
        fl.FileName = fileName;
        fl.Id = id;
        fl.FileType = fileType;
        fl.MD5 = md5Src;
        fl.Data = new Binary(allData);
        try
        {
            dc.SubmitChanges();
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }

    }

    return ret;
}