public Form15()
 {
     InitializeComponent();
     if (frm == null)
     {
         frm = this;
     }
     this.dataGridView11.DataSource = MINUTES.GET_ALL_MINUTES();
 }
        private void button5_Click(object sender, EventArgs e)
        {
            Form15 frm = new Form15();

            frm.ShowDialog();
        }
 private void Form15_Load(object sender, EventArgs e)
 {
     frm = null;
 }
 static void frm_FormClosed(object sender, FormClosedEventArgs e)
 {
     frm = null;
 }