Deleting all the files in the Azure Cosmos DB,

Cosmos_4_ModifyDocs.cs

private async Task ModifyAllDocs()
{
    List<SensorTick> docs = _client.CreateDocumentQuery<SensorTick>(_dbcUri).ToList();

    foreach (var doc in docs)
    {
        doc.Temperature += 100;
        Uri docUri = UriFactory.CreateDocumentUri(DbName, CollectionName, doc.Id);
        await _client.ReplaceDocumentAsync(docUri.ToString(), doc);
        Console.WriteLine(@"Updated: {0}", doc.Id);
    }
}