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http://wiki.developerforce.com/page/Integrating_Force.com_with_Microsoft_.NET
C# code for create, update, upsert, query and retrive is in the below links,
http://http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_calls_create.htm http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_calls_update.htm http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_calls_upsert.htm http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_calls_query.htm http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_calls_retrieve.htm
Thanks!