To reproduce: string filePath = @"D:\Projects\1015954MenuItemHTML\1015954MenuItemHTML\Resources\calendar.png"; StringBuilder sbItem = new StringBuilder(); sbItem.Append("<html><b>aaa<img src=" + filePath + ">"); sbItem.Append("</html>"); RadMenuItem item = new RadMenuItem(); item.Text = sbItem.ToString(); this.radMenuItem1.Items.Add(item); Workaround: use resource file: string filePath = @"res:_1015954MenuItemHTML.Resources.calendar.png";
This would be greate.