LINQ for reading an XML file

Dear All

Using LINQ,I wanted to search all the cities starting with specific series of characters from the attached sample XML  file format.
I am completly new to LINQ.
I am using following lines for the extraction,.but facing some issue.Please help.

***************************************************************************************
var Locations = from city in doc.Root.Elements("row").Attributes("CITY")
                                where city.Value.StartsWith(Filter)
                                select city;
***************************************************************************************

Thanks in advance.
Sample.xml