DataGridViewComboBox Column -Value not retained

See more:

C#

.NET

WinForms

Hi All,
I am pretty new to windows programming.
I have a DataGridView (DGV) with one of the column of type DataGridViewComboBox(DGVC).
I have binded the DGV toa dataset and binded the DGVC with the dataTable. One the based of one of the column value dataset I am settign the selection in DGVC at the time of loading. For this I am using CellFormatting event.

Concern:
After the grid is laoded perfectly, and I change the value of the DGVC to some new value, the value is not retained the moment I move to some other cell of the DGV.

Please see my code.

const string GFRN_TYPE_COMBO_COL_NAME = "GFRNTypeComboColumn";

public frmGFRNDetails()
   {
       InitializeComponent();
   }

   private void frmGFRNDetails_Load(object sender, EventArgs e)
   {
       DataSet ds = GetDummyData();
       dgGFRNDetails.DataSource = ds.Tables[0];

       BindGFRNTypeComboColumn();

       dgGFRNDetails.Columns[dgGFRNDetails.ColumnCount - 1].DisplayIndex = 2;

       dgGFRNDetails.Columns["GFRN"].HeaderText = "GFRN";
       dgGFRNDetails.Columns["GFRN_TYPE"].HeaderText = "GFRN Type";
       dgGFRNDetails.Columns["GFRN_TYPE"].Visible = false;
       dgGFRNDetails.Columns["REGULATORYSEGMENT"].HeaderText = "Regulatory Segment";
       dgGFRNDetails.Columns["SUPPORT"].HeaderText = "Support";
       dgGFRNDetails.Columns["GFCID"].HeaderText = "GFCID";
       dgGFRNDetails.Columns["COMPANYNAME"].HeaderText = "Company Name";
       dgGFRNDetails.Columns["FRR"].HeaderText = "FRR";
       dgGFRNDetails.Columns["FRR_SOURCE"].HeaderText = "FRR SOURCE";
       dgGFRNDetails.Columns["OSUC"].HeaderText = "OSCU";
       dgGFRNDetails.Columns["OSUC_SOURCE"].HeaderText = "OSUC SOURCE";
   }

   private void btnClose_Click(object sender, EventArgs e)
   {
       this.Hide();
   }

   private void BindGFRNTypeComboColumn()
   {
       DataTable dt = new DataTable();
       dt.Columns.Add("Item");
       dt.Columns.Add("Value");
       dt.Rows.Add(" ", "0");
       dt.Rows.Add("Recourse", "1");
       dt.Rows.Add("Non Recourse", "2");
       DataGridViewComboBoxColumn cmb = new DataGridViewComboBoxColumn();
       cmb.Name = GFRN_TYPE_COMBO_COL_NAME;
       cmb.HeaderText = "GFRN Type";
       cmb.DisplayMember = "Item";
       cmb.ValueMember = "Value";
       dgGFRNDetails.Columns.Add(cmb);
       cmb.DataSource = dt;
       for (int i = 0; i < dgGFRNDetails.Rows.Count; i++)
       {
           dgGFRNDetails.Rows[i].Cells[GFRN_TYPE_COMBO_COL_NAME].Value = (cmb.Items[0] as DataRowView).Row[1].ToString();
       }
   }

   private DataSet GetDummyData()
   {
       DataSet dsGFRNDetails = new DataSet();
       dsGFRNDetails = new localhost.Service().GetFRRDetails("1000981067");
       return dsGFRNDetails;
   }

   private void dgGFRNDetails_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
   {


   }

   private void dgGFRNDetails_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
   {
       var gfrnValue = dgGFRNDetails.Rows[e.RowIndex].Cells[2].Value;
       string gfrn = string.Empty;
       if (gfrnValue != null)
       {
           gfrn = gfrnValue.ToString();
       }
       if (!string.IsNullOrEmpty(gfrn))
       {
           DataGridViewComboBoxColumn comboCol = this.dgGFRNDetails.Columns[GFRN_TYPE_COMBO_COL_NAME] as DataGridViewComboBoxColumn;
           if (comboCol != null)
           {
               switch (gfrn)
               {
                   case "Recourse":
                       dgGFRNDetails.Rows[e.RowIndex].Cells[GFRN_TYPE_COMBO_COL_NAME].Value = (comboCol.Items[1] as DataRowView).Row[1].ToString();
                       break;
                   case "Non Recourse":
                       dgGFRNDetails.Rows[e.RowIndex].Cells[GFRN_TYPE_COMBO_COL_NAME].Value = (comboCol.Items[2] as DataRowView).Row[1].ToString();
                       break;
                   default:
                       dgGFRNDetails.Rows[e.RowIndex].Cells[GFRN_TYPE_COMBO_COL_NAME].Value = (comboCol.Items[0] as DataRowView).Row[1].ToString();
                       break;
               }
           }
           // e.CellStyle.BackColor = Color.Pink;
       }
   }

Please HELP !!

"Happy Coding"