Generate a class diagram from Visual Studio

For generating the class diagram visual studio is providing the in-built option please use that, Go to class view window of your project, RightClick -> select View -> click on View Class Diagram. This will generate class diagram for your project.

Ref:

• https://msdn.microsoft.com/en-us/library/ff657806.aspx
• How to generate class diagram from project in Visual Studio 2013?

Thanks

For Visual Studio 2017, 2019 and 2022

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This feature is still available, but it is NOT installed by default, you have to install it separately.

1. From inside Visual Studio go to Tools -> Get Tools and Features
2. Select the Individual components tab and search for Class Designer
3. Check this Component and Install it

After finish installing this component

1. Right-click on the project and select Add -> Add New Item A. Search for 'class' word and NOW you can see Class Diagram component

Very Important Update From the Comments below

1. Right-clicking on a folder and selecting Add New Item will NOT show the Class Diagram option
2. Not every project type will support Class Diagram For example,
   Right-clicking on Class Library project and selecting Add New Item will DO show Class Diagram options
   But Right-clicking on ASP.NET project and selecting Add New Item will NOT show Class Diagram options