private void btnDelete_Click(object sender, EventArgs e)
        {
            DialogResult result = MessageBox.Show("Are you sure?", "Warning", MessageBoxButtons.YesNo);

            if (result == DialogResult.Yes)
            {
                if (detail.State == PermissionStates.Approved || detail.State == PermissionStates.Disapproved)
                {
                    MessageBox.Show("You can't delete approved or disapproved permission!");
                }
                else
                {
                    PermissionBLL.DeletePermision(detail.PermissionID);
                    MessageBox.Show("Permission deleted!");
                    FillAllData();
                    ClearFilters();
                }
            }
        }