Comments by Santhosh Ks (Top 1 by date)

excellent.

selectexcs = selectexcs.TrimEnd(',').Trim();
for (dynamic i = 0, repl = new[,] { { ",,", "," }, { " ", "" } }; i < repl.Length / 2; i++)
{
selectexcs = selectexcs.Replace(repl[i, 0], repl[i, 1]);
selectexcs = selectexcs.Trim();
}
selectexcs= string.Join(",", selectexcs.Split(',').Distinct().ToArray());
numberofbagscanselled = selectexcs.Count(c => c == ',') +1;//duplication of strings separated with camma.