string[] newRow = {"long","d","b"};

Gridview.Rows.Insert(Gridview.Rows.Count, newRow);

    private void SetGridCellEdit()

        {

            if (repgrid != null && repgrid.Rows.Count > )

            {

                string dyeno = string.Empty;

                for (int i = ; i < repgrid.Rows.Count; i++)

                {

                    if (repgrid.Rows[i].Cells["Coldyeno"].Value != null)

                    {

                        dyeno = repgrid.Rows[i].Cells["Coldyeno"].Value.ToString();

                        if (dyeno.Equals("X022")

                            || dyeno.Equals("X009")

                            || dyeno.Equals("X008")

                            || dyeno.Equals("X001")

                            ) //

                        {

                            DataGridViewCell viewCell = repgrid.Rows[i].Cells["Coltarget"];

                            repgrid.CurrentCell = viewCell;

                            viewCell.ReadOnly = false;

                            repgrid.BeginEdit(true);

                        }

                        else

                        {

                            DataGridViewCell viewCell = repgrid.Rows[i].Cells["Coltarget"];

                            repgrid.CurrentCell = viewCell;

                            viewCell.ReadOnly = true;

                        }

                    }

                }

            }

        }