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You can use SOAP api for this. Following document explains this step by step with code samples:
http://wiki.developerforce.com/page/Integrating_Force.com_with_Microsoft_.NET
For details of SOAP api guide: http://www.salesforce.com/us/developer/docs/api/index.htm
Please refer below links ..............It's used soap API.
http://wiki.developerforce.com/page/Integrating_Force.com_with_Microsoft_.NET