> For the complete documentation index, see [llms.txt](https://docs.shouldly.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.shouldly.org/documentation/enumerable/subsetof.md).

# SubsetOf

```cs
var lisa = new Person { Name = "Lisa" };
var bart = new Person { Name = "Bart" };
var maggie = new Person { Name = "Maggie" };
var homer = new Person { Name = "Homer" };
var marge = new Person { Name = "Marge" };
var ralph = new Person { Name = "Ralph" };
var simpsonsKids = new List<Person> { bart, lisa, maggie, ralph };
var simpsonsFamily = new List<Person> { lisa, bart, maggie, homer, marge };
simpsonsKids.ShouldBeSubsetOf(simpsonsFamily);
```

[snippet source](https://github.com/shouldly/shouldly/blob/master/src/DocumentationExamples/CodeExamples/EnumerableShouldBeSubsetOfExamples.ShouldBeSubsetOf.codeSample.approved.cs#L1-L9) | [anchor](#snippet-EnumerableShouldBeSubsetOfExamples.ShouldBeSubsetOf.codeSample.approved.cs)

**Exception**

```
simpsonsKids
    should be subset of
[Lisa, Bart, Maggie, Homer, Marge]
    but
[Ralph]
    is outside subset
```