public static int CompareVersion(string l, string r)
{
if (l.StartsWith("V") || l.StartsWith("v"))
l = l.Substring(1);
var ls = l.Split('.');
var rs = r.Split('.');
for (int i = 0; i < Math.Max(ls.Length, rs.Length); i++)
{
int lp = (i < ls.Length) ? int.Parse(ls[i]) : 0;
int rp = (i < rs.Length) ? int.Parse(rs[i]) : 0;
if (lp != rp)
{
return lp - rp;
}
}
return 0;
}