write object data to excel sheet

void ExcelButton_Click(object sender, RoutedEventArgs e)
{
        dynamic excel = AutomationFactory.CreateObject("Excel.Application");
        excel.Visible = true;
 
        dynamic workbook = excel.workbooks;
        workbook.Add();
 
        dynamic sheet = excel.ActiveSheet;
        dynamic cell = null;
        int i = 1;
 
        // Populate the excel sheet
        foreach (var item in (LayoutRoot.DataContext as Bookmarks).Sites)
        {
                cell = sheet.Cells[i, 1];
                cell.Value = item.Title;
 
                cell = sheet.Cells[i, 2];
                cell.Value = item.Uri;
                cell.ColumnWidth = 100;
 
                i++;
        }
}