int max = Convert.ToInt32(TotalBytes) / 1024 / 1024;
            int read = Convert.ToInt32(BytesRead) / 1024 / 1024;

            int maxs = max;

            int reads = read;

            int maxstunden = maxs / 3600;
            maxs = maxs % 3600;
            int maxminuten = maxs / 60;
            maxs = maxs % 60;
            int maxsekunden = maxs;

            int readstunden = reads / 3600;
            reads = reads % 3600;
            int readminuten = reads / 60;
            reads = reads % 60;
            int readsekunden = reads;


            string maxformat = string.Format("{0:00}:{1:00}:{2:00}", maxstunden, maxminuten, maxsekunden);

            string readformat = string.Format("{0:00}:{1:00}:{2:00}", readstunden, readminuten, readsekunden);

            TimeSpan v = Convert.ToDateTime(maxformat) - Convert.ToDateTime(readformat);

            textBox1.Text = "Noch " + Convert.ToString(v) + " verbleiben";