Get file type icon path

/// <summary>
/// An item was added.
/// </summary>
public override void ItemAdded(SPItemEventProperties properties)
{
        var reportItem = properties.ListItem;
        // icon
        var icon = SPUtility.MapToIcon(properties.Web, reportItem["URL Path"].ToString(), "", IconSize.Size16);
        var iconPath = string.Format("/_layouts/15/images/{0}", icon);

        // do something
}