int dig01 = Convert.ToInt32(ruc.Substring(0, 1))*5;
int dig02 = Convert.ToInt32(ruc.Substring(1, 1))*4;
int dig03 = Convert.ToInt32(ruc.Substring(2, 1))*3;
int dig04 = Convert.ToInt32(ruc.Substring(3, 1))*2;
int dig05 = Convert.ToInt32(ruc.Substring(4, 1))*7;
int dig06 = Convert.ToInt32(ruc.Substring(5, 1))*6;
int dig07 = Convert.ToInt32(ruc.Substring(6, 1))*5;
int dig08 = Convert.ToInt32(ruc.Substring(7, 1))*4;
int dig09 = Convert.ToInt32(ruc.Substring(8, 1))*3;
int dig10 = Convert.ToInt32(ruc.Substring(9, 1))*2;