private void btnDelete_Click(object sender, EventArgs e)
        {
            try
            {
                if (dgvProgramList.Rows.Count > 0)
                {
                    DialogResult dialogResult = MessageBox.Show("Session'u silmek istediğinize emin misiniz?", "Library Management System", MessageBoxButtons.YesNo);
                    if (dialogResult == DialogResult.Yes)
                    {
                        int selectIndex = dgvProgramList.CurrentRow.Index;
                        var sessionID   = dgvProgramList.Rows[selectIndex].Cells[0].Value;

                        SessionsHelper.Delete(Convert.ToInt32(sessionID));

                        MessageBox.Show("Session Silme Başarılı", "Library Management System", MessageBoxButtons.OK, MessageBoxIcon.Information);

                        FillGrid();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Herhangi bir eleman seçmediniz!", "Library Management System", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }