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<TreeView x:Name="treeView" ItemsSource="{Binding}">
    <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding SubCategories}">
            <TextBlock Text="{Binding Name}"/>
        </HierarchicalDataTemplate>
    </TreeView.ItemTemplate>
</TreeView>

var categories = new List<Category>
{
     new Category
      {
         Name = "Fruits",
         SubCategories = new List<Category>  { new Category { Name = "Apple" }, new Category { Name = "Banana" } }
      },
      new Category
      {
         Name = "Vegetables",
        SubCategories = new List<Category>{  new Category { Name = "Carrot" } , new Category { Name = "Broccoli" } }
       }
};

treeView.ItemsSource = categories;

 public class Category
 {
     public string Name { get; set; }
     public List<Category> SubCategories { get; set; }
 }