information  from form1 to form2 one time in holle project

form exitample
-------------
public partial class Form1 : Form
   {  public Form2 f2 = new Form2();
       public Form1 f1 = new Form1();
        string st = "server=localhost;user id=root; password=;
database=nwin; pooling=false";

       public MySqlConnection conn = new MySqlConnection();
               conn.connectionString=st;
conn.open( );  // connection is opening now
.
.
.
-.*----
-          ----
------now FORM2
public partial class Form2 : Form

   hot to get that "conn" from form1