Only Visible true Columns Copy N Paste

Hello 

I want Only Visible true Columns Copy N Paste.

/////////////Source///////////////////

//Grid SelectionMode

 this.grdItem.SelectionMode = C1.Win.C1FlexGrid.SelectionModeEnum.ListBox;

//KeyDown Event

 public void set_GridCopyAndPaste(C1.Win.C1FlexGrid.C1FlexGrid oGrid, KeyEventArgs e)
        {
            if (e.Control)
            {
                switch (e.KeyCode)
                {
                    case Keys.Insert:
                    case Keys.C: // ** copy
                        Clipboard.SetDataObject(oGrid.Clip);
                        break;
                    case Keys.X: // ** cut
                        Clipboard.SetDataObject(oGrid.Clip);
                        CellRange rg = oGrid.Selection;

                        rg.Data = null;
                        break;
                    case Keys.V: // ** paste
                        //If C1Grid.Row > 0 And C1Grid.Col > C1Grid.Cols.Frozen And C1Grid.Cols(C1Grid.Col).AllowEditing Then

                        //if (oGrid.Row > 0 && oGrid.Col > oGrid.Cols.Frozen && oGrid.Cols[oGrid.Col].AllowEditing)

                        if (oGrid.Row > 0 && oGrid.Cols[oGrid.Col].AllowEditing)
                        {
                            IDataObject data = Clipboard.GetDataObject();
                            if (data.GetDataPresent(typeof(string)))
                            {
                                // get content (note: Excel appends a cr/lf)
                                string clip = (string)data.GetData(typeof(string));
                                if (clip.EndsWith("\r\n"))
                                    clip = clip.Substring(0, clip.Length - 2);

                                oGrid.Select(oGrid.Row, oGrid.Col, oGrid.Rows.Count - 1, oGrid.Cols.Count - 1, false);
                                oGrid.Clip = clip;
                                oGrid.Select(oGrid.Row, oGrid.Col, false);
                            }
                        }
                        break;

                }
            }
        }