Folder Modified Date doesn't get updated

Scenario:
One of the bug in sharepoint folders is that they don't get updated when a new item inside the folder is added / updated. Modified Date of the folder will still show the old time stamp.

Solution:
I quickly wrote an Item Event Handler which can fix the time stamp for the item folder.

Code:

/// <summary>
/// Asynchronous after event that occurs after a new item has been added to its containing object.
/// </summary>
/// <param name="properties">
/// A Microsoft.SharePoint.SPItemEventProperties object that represents properties of the event handler.
/// </param>
    public override void ItemAdded(SPItemEventProperties properties)
      {
          string listItemUrl = properties.ListItem.Url;
          string temp = listItemUrl.Remove(listItemUrl.LastIndexOf('/'));
          string folderName = temp.Substring(temp.LastIndexOf('/') + 1);

          SPQuery query = new SPQuery()
          {
              Query = string.Format("<Where><And><Eq><FieldRef Name='ContentType' /><Value Type='Text'>folder</Value></Eq><Eq><FieldRef Name='Title' /><Value Type='Text'>{0}</Value></Eq></And></Where>",folderName),
              RowLimit = 1
          };

          SPList list = properties.ListItem.ParentList ;
          SPListItemCollection items = list.GetItems(query);

          items[0].Update();
          list.Update();
      }

Note:
Right now this code will fix the Modified date of the folder only when a new item is added , so need to have the same code in Item updated if you want Folder modified date to be changed.

Also please test fully in case you have more than one level of folder structure.I think it will work but I haven't tested it.