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If you are a developer working with Microsoft`s .NET framework, you may have heard of code contracts. These are a way of defining and enforcing rules for the behavior of your code. Microsoft provides a library called Code Contracts that makes it easy to use this technique in your .NET projects.

However, finding and downloading the Code Contracts library can be confusing. In this article, we will walk you through the process of downloading and setting up Code Contracts for your .NET projects.

Step 1: Check Your .NET Version

Before you can download Code Contracts, you need to make sure that your .NET version is compatible with the library. Code Contracts require .NET 4.0 or later, so if you are using an earlier version, you will need to upgrade.

You can check your .NET version by opening a command prompt and typing «dotnet –version». If the output is less than 4.0, you will need to install a newer version.

Step 2: Download Code Contracts

To download Code Contracts, go to the Microsoft website and navigate to the Code Contracts download page. There, you will see a list of available downloads for different versions of Visual Studio and .NET.

Choose the download that matches your version of Visual Studio and .NET. If you are unsure which version to use, consult the documentation for your project or ask your development team.

Once you have downloaded the installer, run it to install Code Contracts on your computer.

Step 3: Set Up Your Project

Now that you have Code Contracts installed, you need to set it up for your .NET project. The easiest way to do this is to use NuGet, a package manager for .NET.

Open your project in Visual Studio and go to the NuGet Package Manager. Search for «CodeContracts» and install the package.

Once the package is installed, you need to enable Code Contracts for your project. Go to the project properties and navigate to the «Code Contracts» tab. Check the «Perform Runtime Contract Checking» box and choose your desired level of checking (e.g. «Full» or «Release»).

Step 4: Use Code Contracts in Your Code

Now you are ready to start using Code Contracts in your .NET code. To define a contract, use the «Contract» class provided by the Code Contracts library.

For example, if you want to ensure that a method always returns a positive integer, you can add the following code to the method:


Contract.Ensures(Contract.Result() > 0);


This will generate a runtime error if the method ever returns a non-positive integer.


Code Contracts are a powerful tool for ensuring the correctness of your .NET code. By following the steps outlined in this article, you can download and set up the Code Contracts library for your projects. With Code Contracts, you can define and enforce rules for your code that will help you catch bugs and improve the reliability of your software.