operator="in" , Fetch Xml, MS CRM 2011

hi,

i have a guid's string array.

ex: string[] recordGuids;

i want to use this in fetchxml by using condition operator "in".

i have tried this below code but no success ("The remote server returned an error: NotFound.").

            var fetchXml = @"<fetch mapping='logical'><entity name='annotation'><attribute name='filename' /><filter><condition attribute='objectid' operator='in'>"+"<value>" + recordGuids + "</value>" +"</condition>"+"</filter>"+"</entity>"+"</fetch>";

when i debug and check the query, that was something like this( which is wrong query ).

<fetch mapping='logical'><entity name='annotation'><attribute name='filename' /><filter><condition attribute='objectid' operator='in'>
<value>System.String[]</value>
</condition>
</filter>
</entity>
</fetch>

can anyone give me an idea to retrieve set of records by using condition operator "in" by passing string array.

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