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Working with MongoDB Transactions with C# and the .NET Framework

Robert Walters3 min read • Published Jan 28, 2022 • Updated Sep 23, 2022
.NETMongoDBC#
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Update 10/2019: This article's code example has been updated to include the required handing of the session handle to database methods.
C# applications connected to a MongoDB database use the MongoDB .NET driver. To add the .NET driver to your Visual Studio Application, in the NuGet Package Manager, search for "MongoDB".
Make sure you choose the latest version (>=2.7) of the driver, and press Install.
Prior to MongoDB version 4.0, MongoDB was transactionally consistent at the document level. These existing atomic single-document operations provide the transaction semantics to meet the data integrity needs of the majority of applications. This is because the flexibility of the document model allows developers to easily embed related data for an entity as arrays and sub-documents within a single, rich document. That said, there are some cases where splitting the content into two or more collections would be appropriate, and for these cases, multi-document ACID transactions makes it easier than ever for developers to address the full spectrum of use cases with MongoDB. For a deeper discussion on MongoDB document model design, including how to represent one-to-many and many-to-many relationships, check out this article on data model design.
In the following code we will create a Product object and perform a MongoDB transaction that will insert some sample data into MongoDB then update the prices for all products by 10%.
Source Code available on Gist. Successful execution yields the following:

Key points:

  • You don't have to match class properties to JSON objects - just define a class object and insert it directly into the database. There is no need for an Object Relational Mapper (ORM) layer.
  • MongoDB transactions use snapshot isolation meaning only the client involved in the transactional session sees any changes until such time as the transaction is committed.
  • The MongoDB .NET Driver makes it easy to leverage transactions and leverage LINQ based syntax for queries.
Additional information about using C# and the .NET driver can be found in the C# and .NET MongoDB Driver documentation.

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Table of Contents
  • Key points: