Using a datagridview as a lookup window

I got this to work using these three methods. First I call the lookup window by clicking a button.

        private void btnHistBatch_Click(object sender, EventArgs e)
        {
            using (frmLookupBatchIDs LookupBatchIDsForm = new frmLookupBatchIDs(batchNumber))
            {
                if (LookupBatchIDsForm.ShowDialog(this) == DialogResult.OK)
                {
                    LookupBatchIDsForm.Show();
                    LookupBatchIDsForm.Activate();
                    LookupBatchIDsForm.Focus();
                    batchNumber = LookupBatchIDsForm.CellValue;
                }
            }

            txtBatchID.Text = batchNumber;
        }

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I then populate a datagridview
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        public frmLookupBatchIDs(string bachNumber)
        {
            InitializeComponent();

            DataTable batchIDs = new DataTable();
            int BatchRecords = DataAccess.GetListofSOPBatches(Dynamics.Globals.IntercompanyId, ref batchIDs);
            if (BatchRecords == 0)
            {
                MessageBox.Show("No invoice batches found");
            }

            dgvBatchIDs.ReadOnly = true;
            dgvBatchIDs.RowHeadersVisible = false;
            dgvBatchIDs.DataSource = batchIDs;

            dgvBatchIDs.Columns[0].Width = 250;
            dgvBatchIDs.Columns[0].HeaderText = "Batch IDs";
        }
--------------------------------------------------------------------------------------
I then use method to select the value.

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        private void btnSelect_Click(object sender, EventArgs e)
        {
            int CurrentRow;
            int columnToReturn = 0;

            CurrentRow = dgvBatchIDs.CurrentCell.RowIndex;
            dgvBatchIDs.CurrentCell = dgvBatchIDs[columnToReturn, CurrentRow];
            CellValue = dgvBatchIDs.CurrentCell.Value.ToString();

            /* Retrieve Customer number */
            custValue = dgvBatchIDs[columnToReturn, CurrentRow].Value.ToString();

            DialogResult = DialogResult.OK;            

            return;
        }
--------------------------------------------------------------------------------------------

My question now is how does a value actually come back? I am using CellValue to return the value.
Is it simply
            CurrentRow = dgvBatchIDs.CurrentCell.RowIndex;
            dgvBatchIDs.CurrentCell = dgvBatchIDs[columnToReturn, CurrentRow];
            CellValue = dgvBatchIDs.CurrentCell.Value.ToString();

CurrentRow gets the current highlighted row
dgvBatchIDs.CurrentCell gets the value in the current cell
CellValue is then assigned that value?

I think I am over thinking this. I am still trying to get used C#.

Thanks for your input.