search collectionBase

Question

Hey guys i have a litle project to do in class and im really stock on this part..

i set up an ATM machine.when the clients inserts nip it searches a file and loads the collections with the data from the files..for save use..

no i sent the data inserted(nip ) to the main window once the nip is ok.


now i  need to search the collection for the client with this nip..


i got the variable set as is
[code]

public Main(string qs)

        {

            InitializeComponent();

           

            richTextBox1.Text= qs;

            string NipClient = qs;

            Guichet.ListClient(NipClient);

            

        }

[/code]

form nip page

[code]

Main form2 = new Main(textBox1Search.Text);

                form2.ShowDialog();
[/code]