private void btnDelete_Click(object sender, EventArgs e)
        {
            DialogResult dialogResult = MessageBox.Show("Are you sure you wanna delete this? ", "Computer Parts",
                                                        MessageBoxButtons.YesNo);

            if (dialogResult == DialogResult.Yes)
            {
                int index = this.gridManageComputers.Rows.IndexOf((GridViewDataRowInfo)this.gridManageComputers.CurrentRow);
                if (index < 0)
                {
                    return;
                }
                BO.Computer computer = (BO.Computer)gridManageComputers.Rows[index].DataBoundItem;
                if (index != null)
                {
                    _computersBll.Remove(computer.ComputerID);
                }
            }
            else if (dialogResult == DialogResult.No)
            {
                this.Hide();
                ManageComputers mg = new ManageComputers();
                mg.ShowDialog();
            }
        }
        private void btnUpdate_Click(object sender, EventArgs e)
        {
            int index = this.gridManageComputers.Rows.IndexOf((GridViewDataRowInfo)this.gridManageComputers.CurrentRow);

            if (index < 0)
            {
                return;
            }
            BO.Computer computer = (BO.Computer)gridManageComputers.Rows[index].DataBoundItem;

            if (computer != null)
            {
                ComputersEdit ce = new ComputersEdit();
                ce.txtComputerID.Text   = gridManageComputers.CurrentRow.Cells[0].Value.ToString();
                ce.cmbPC.Text           = gridManageComputers.CurrentRow.Cells[1].Value.ToString();
                ce.txtPricePerHour.Text = gridManageComputers.CurrentRow.Cells[2].Value.ToString();

                ce.ShowDialog();
            }
        }