Remove a taxon from the associated content item
To remove the taxon from the content items, you need to perform the following:
    - Use TaxonomyManager, which is the manager class for taxonomies.
 
- Use ContentManager, which is the manager class for content.
 The sample uses theContentManagerclass as an example, but you can use it for all content types, including dynamic content.
 
- Query the category as a HierarchicalTaxon.
 
- Query the content items associated with the category.
 
- Iterate through the content items and remove the taxon. 
 Use the organizer’sRemoveTaxonmethod. To remove multiple taxons or taxa, you can use theRemoveTaxamethod instead.
 
- Call the manager’s SaveChangesmethod to persist the changes to the database.
Consider the complete code snippet:
NOTE: 
UrlNameCharsToReplace and 
UrlNameReplaceString are two constants that you will need to define as follows:
    - public const string UrlNameCharsToReplace = @"[^\w\-\!\$\'\(\)\=\@\d_]+";
- public const string UrlNameReplaceString = "-";