As with the above two approaches, we need to manually change each project. This is my favorite approach, as by using this approach we can change the target language version to C# 7.1 for all the projects at once. Make sure to add this element for each build configuration if you are having multiple build configurations for your project. csproj option on a project in solution explorer window as below. NET Standard projects, we can directly edit using Visual Studios by right clicking and selecting Edit. In this approach, we need to explicitly edit the project's project file i.e., csproj file.

Now your project will run on C# 7.1 compiler and you can use these new features. Once you select C# 7.1 from this drop-down, click on OK and save the project. If we select any other option, even if there are any major or minor changes, runtime won't consider those and will take only the compiler version which you provide here. This is something different from the above, when we select this option the runtime will take the latest minor release, in our case C# 7.1 and in the future, if there is a C# 7.2 release, this project will automatically point to the C# 7.2 compiler without any changes. When we select this option the runtime will take the latest major release available, in our case C# 7.0, and in the future, if there is a C# 8.0 release, this project will automatically point to the C# 8.0 compiler without any changes. Once the properties window opens, go to Build menu and click on Advanced button. Once this button is clicked a popup window will appear where you can see a language version drop down where we need to select C# 7.1 as shown below.Īs noticed in this dropdown, we find an option

Upgrade visual studio project