Allows setting of properties on the specified configuration section for the specified configuration path. If the configuration ...

Allows setting of properties on the specified configuration section for the specified configuration path.  If the configuration path is not specified, it sets the specified properties for the entire server.  Otherwise, it sets the specified properties for the specified path, persisting the changes at that path. The configuration section must be specified. The value of a specified collection indexer is url escaped therefore the plus character encodes the space character and the character sequence %%2b encodes the plus character.