void M_SetLine(string LineName, int LineNumber, double price, color Clr)
{
   string FullLineName = LineName + IntegerToString(LineNumber);
   
   // check if object exists, otherwise create a new one
   if(ObjectFind(0, FullLineName) < 0)
   {
      M_CreateLine(FullLineName, Clr, price);
      
   }
   else
   {      
      // Move endpoint to actual time
      ObjectMove(0, FullLineName, 1, TimeCurrent(), price);
      
   }
}