XML comment:

/// <summary>
/// Summary of LoadXMLFromFile.
/// </summary>
/// <param name="FilePath">Description of FilePath parameter.</param>
public void LoadXMLFromFile(string FilePath)

Non-XML comment
/* Summary of LoadXMLFromFile
*
* @param Filepath Description of FilePath parameter.
**/
public void LoadXMLFromFile(string FilePath)

Or, Python-style:

def LoadXMLFromFile(FilePath):

"""Summary of LoadXMLFromFile

.. describe:: FilePath
	Description of FilePath parameter.
"""

Notice the difference? With comments, you don't need a bunch of XML cruft obscuring the text.