C#

namespace Passing_Data
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Form2 frm = new Form2(textBox1.Text);
            frm.Show();

        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}
FORM 2:
namespace Passing_Data
{
    public partial class Form2 : Form
    {
        public Form2(String strTextBox)
        {
            InitializeComponent();
            label1.Text = strTextBox;
        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }
    }
}

public class Employees
{
    public static List<Employee> ListEmployees;

    public static void FillEmployees()
    {
        ListEmployees = FillFromSQL();
    }
}
class Program
{
    static void Main(string[] args)
    {
        Employees.FillEmployees();
    }
}

public class Employees
{
   private List<Employee> ListEmployees;

    public void FillEmployees()
    {
        ListEmployees = FillFromSQL();
    }
    public void FindEmployee(Predicate<Employee> e)
    {
        return ListEmployees.Find(e);
    }
}
class Program
{
    Employees employees;

    static void Main(string[] args)
    {
        employees = new Employees();
        employees.FillEmployees();
    }
}