Compare arraylist

[irobot]

Hi.
I would like to ask how to compare three or more Arraylists?
I need to dublicate ellements from Arraylists, in order to filter datagridview.
I would like to choose from 1 to 5 Arraylists. I know how to compare two Aarraylists.

[tlhintoq]

Would this make sense/work for you?

Compare A-B
Compare B-C
Compare C-D
Compare D-E

[PRR]

Look into ArrayList contains and equals method

public static void CompareArrayList()
        {
            ArrayList al = new ArrayList();
            al.Add(1);
            al.Add("2");
 
            ArrayList al1 = new ArrayList();
            al1.Add(1);
            al1.Add("2");
 
            bool isEqual = true ;
 
            if (al.Count == al1.Count)
            {
                for(int i=0;i<al.Count;i++)
                {
                    if (al[i] .Equals( al1[i])==false)
                    {
                        isEqual = false;
                        break;
                    }
                }
           }
// OR you could use Contains method
if (al.Count == al1.Count)
            {
                for (int i = 0; i < al.Count; i++)
                {
                    if (al1.Contains(al[i])==false)
                    {
                        isEqual = false;
                        break;                        
                    }
               }
          }
       }
 
 

[r035198x]

Your description doesn't really say what you want to do.
Why not post an example of input lists and expected output from those input lists.