I have a problem in a same namespace:

public partial class frmForm1 : Form  // Form1
        {
     public class Account
            {
                public string Username;
                public string Password;

            }

        public class ListAcc
        {
            public static int count = 0;
            private static List<Account> UserList;
            public static List<Account> Data()
            {
                return UserList;
            }
        }
}


 public partial class frmForm2 : Form  // Form2
    {

        private void button2_Click(object sender, EventArgs e)
        {
            frmForm1.Account A;
            string m = frmForm1.ListAcc<A>.[0].Username; //ERROR
        }
    }

How could i access the attributes (Username, Password...) in frmForm1? Someone help me? Thanks!