How to print list student simultaneously ?

using System.Windows.Forms;
list<string> students = new list<string>();


void main
{
  fillStudentList();
  PrintStudents();
}

void PrintStudents()
{
  foreach (string s in students)
  {
    MessageBox.Show(s);
  }
}

void fillStudentList()
{
  students.Add("John");
  students.Add("Jack");
  students.Add("Pete");
  students.Add("Mario");
}