private void bfbtn_EditBooks_Click(object sender, EventArgs e)
        {
            EditBooks eb = new EditBooks();

            eb.Show();
            this.Hide();
        }
        private void bfbtn_Delete_Click(object sender, EventArgs e)
        {
            EditBooks eb = new EditBooks();

            eb.Owner = this;
            eb.Show();
            istek = true;
        }
        private void bunifuImageButton3_Click(object sender, EventArgs e)
        {
            DialogResult dialogResult = MessageBox.Show("Program Tamamen Kapatılacaktır", "Emin Misiniz ?", MessageBoxButtons.YesNo);

            if (dialogResult == DialogResult.Yes)
            {
                EditBooks eb = new EditBooks();
                this.Close();
                Application.Exit();
            }
        }