[RESOLVED] Why does my datagridviewcolumn not accept changes at this point?

[MaslowB]

I'm bringing down a strongly typed dataset table into a datagridview. then adding a column of combo boxes to let the foreign keys be selected by name instead of ID. Perhaps there's an easier way to do this.

can I transform the typeID column into a comboboxcolumn while still being able to cast the datasource back to my strongly typed dataset table type? Do I need to get it back from the datasource or do changes on the datagridview automatically get passed back to the Dataset?

What's wrong with this code?

FormDg fDg;
        internal DsTech.TechObjectsDataTable ShowDg(IWin32Window owner, Db db)
        {
                fDg = new FormDg();

                fDg._dg.DataSource = db.getDs().TechObjects;
                var TypeSelecter = new DataGridViewComboBoxColumn();
                var types = db.getdsObjectTypes();
                TypeSelecter.DataSource = types;
                TypeSelecter.DisplayMember = "type";
                TypeSelecter.Name = "Types";
                TypeSelecter.ValueMember = "ID";
                fDg._dg.Columns["typeID"].DisplayIndex=fDg._dg.Columns.Count-1;
                fDg._dg.Columns.Add(TypeSelecter);
                fDg._dg.ReadOnly = false;
                Application.DoEvents();
                for (int i = 0; i < fDg._dg.RowCount; i++)
                {
                        if ((fDg._dg.Rows[i].Cells["typeID"].Value is DBNull) == false)
                //Line below does not work
                                UpdateTypesRow(i,(int)fDg._dg.Rows[i].Cells["typeID"].Value);
                }
                fDg._dg.CellEndEdit += new DataGridViewCellEventHandler(_dg_CellEndEdit);


                if (fDg.ShowDialog(owner) == DialogResult.OK)
                {
                        return (DsTech.TechObjectsDataTable)fDg._dg.DataSource;
                }
                else return null;

        }

While this code works just fine

void _dg_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
                if (fDg._dg.Columns[e.ColumnIndex].Name == "Types")
                {
                        fDg._dg.Rows[e.RowIndex].Cells["typeID"].Value = fDg._dg.Rows[e.RowIndex].Cells["Types"].Value;
                        //update typeID column

                }
                else if (fDg._dg.Columns[e.ColumnIndex].Name == "typeID")
                {
                        //update types column
                        UpdateTypesRow(e.RowIndex,(int) fDg._dg.Rows[e.RowIndex].Cells["typeID"].Value);
                }
        }

Here's the code I factored the 2 into just in case I was reading wrong and they were actually different

  void UpdateTypesRow(int rowIndex, int value)
        {
                fDg._dg.Rows[rowIndex].Cells["Types"].Value = value;
        }

[jmcilhinney]

You should be adding the combo box column BEFORE binding, not after. Follow the CodeBank link in my signature and you'll find a thread dedicated to the topic of adding combo boxes to a DataGridview.

[MaslowB]

ok, I found the post I will look into it more as soon as I get to work tomorrow. Thanks