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    static class Program
    {
        /// <summary>
        /// Der Haupteinstiegspunkt für die Anwendung.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            
            Application.Run(new Form1());
        }
        DataTable dt = new DataTable("Person");
    }					

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    public partial class Form2 : Form
    {
        private readonly Form1 fh;
        
        public Form2(Form1 aufrufer)
        {
            fh = aufrufer; //S258

            
            InitializeComponent();
        }
        //DataTable dt = new DataTable("Person");

        private void Form2_Load(object sender, EventArgs e)
        {

            DGVSP.DataSource = dt;
        }
    }					

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public partial class Form1 : Form
{
  
  {...}

  public DataTable dt { get; protected set; } = new DataTable("Person");
  
}					

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public partial class Form2 : Form
{
  {...}
  
  public Form2(Form1 aufrufer)
  {
    fh = aufrufer; //S258
    DGVSP.DataSource = fh.dt;
    
    InitializeComponent();
  }
  
  {...}
}