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Upload and replace file in given folder on Google Docs using .net api
service = new DocumentsService("SRDUploader");
DocumentEntry lastUploadEntry = service.UploadDocument(file, null );

DocumentEntry parent = ....;
DocumentEntry deleting = ....;

deleting.Delete();

string feed = string.Format(DocumentsListQuery.foldersUriTemplate, parent.ResourceId);
// http://docs.google.com/feeds/default/private/full/{0}/contents

var result = service.Insert(new Uri(feed), fileStream, fileExtension, fileName);