How can I paste selected cells on datagrid bounded by entity framework?

After frequent search on almost all sites, I've failed to get a solution to the problem. My datagrid is bound to SQL server database using entity framework hence no MVVM pattern. The copy from datagrid seems to work with a few codes (seems inbuilt) but the paste has failed. The available solutions generate errors, ie datagrid doesn't contain a definition for selectedCell...

HOW BEST CAN I PASTE DATA FROM EXCEL TO WPF DATAGRID ENTITY FRAMEWORK BASED... I've tried this

        private void OnKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.C && (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
            {
                // DataObject d = ClipboardHelper.ParseClipboardData(); Clipboard.SetDataObject(d);
            }

            if (e.Key == Key.V &&
                (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
            {

                // 2-dim array containing clipboard data
                string[][] clipboardData =
                    ((string)Clipboard.GetData(DataFormats.Text)).Split('\n')
                    .Select(row =>
                        row.Split('\t')
                        .Select(cell =>
                            cell.Length > 0 && cell[cell.Length - 1] == '\r' ?
                            cell.Substring(0, cell.Length - 1) : cell).ToArray())
                    .Where(a => a.Any(b => b.Length > 0)).ToArray();

                // the index of the first DataGridRow          
                int startRow = ItemContainerGenerator.IndexFromContainer(
                   (DataGridRow)ItemContainerGenerator.ContainerFromItem(SelectedCells[0].Item));
                int targetRowCount = SelectedCells.Count;

                // the destination rows 
                //  (from startRow to either end or length of clipboard rows)
                DataGridRow[] rows =
                    Enumerable.Range(
                        startRow, Math.Min(Items.Count, targetRowCount))
                    .Select(rowIndex =>
                        ItemContainerGenerator.ContainerFromIndex(rowIndex) as DataGridRow)
                    .Where(a => a != null).ToArray();

                // the destination columns 
                //  (from selected row to either end or max. length of clipboard colums)
                DataGridColumn[] columns = Columns.OrderBy(column => column.DisplayIndex)
                    .SkipWhile(column => column != this.CurrentCell.Column)
                    .Take(clipboardData.Max(row => row.Length)).ToArray();

                for (int rowIndex = 0; rowIndex < rows.Length; rowIndex++)
                {
                    string[] rowContent = clipboardData[rowIndex % clipboardData.Length];
                    for (int colIndex = 0; colIndex < columns.Length; colIndex++)
                    {
                        string cellContent =
                            colIndex >= rowContent.Length ? "" : rowContent[colIndex];
                        columns[colIndex].OnPastingCellClipboardContent(
                            rows[rowIndex].Item, cellContent);
                    }
                }

            }
        }

errors: 1. object doesnot contai a definition for IndexFromContainer and no extension containing IndexFromContainer can be found. 2.SelectedCells[0] 3.SelectedCells.Count 4.Usercontrol1 Doesnot contain a definition for CurrentCell and Items