Blazor TreeView - A High-Performance Hierarchical Tree Control

@using Syncfusion.Blazor.Navigations
<SfTreeView TValue="MailItem">
<TreeViewFieldsSettings TValue="MailItem" Id="Id" DataSource="@MyFolder" Text="FolderName" ParentID="ParentId" HasChildren="HasSubFolders" Expanded="Expanded"></TreeViewFieldsSettings>
</SfTreeView>

@code{
public class MailItem
{
    public string Id { get; set; }
    public string ParentId { get; set; }
    public string FolderName { get; set; }
    public bool Expanded { get; set; }
    public bool HasSubFolders { get; set; }
}
List<MailItem> MyFolder = new List<MailItem>();
protected override void OnInitialized()
{
    base.OnInitialized();
    MyFolder.Add(new MailItem
    {
        Id = "1",
        FolderName = "Inbox",
        HasSubFolders = true,
        Expanded = true
    });
    MyFolder.Add(new MailItem
    {
        Id = "2",
        ParentId = "1",
        FolderName = "Categories",
        Expanded = true,
        HasSubFolders = true
    });
    MyFolder.Add(new MailItem
    {
        Id = "3",
        ParentId = "2",
        FolderName = "Primary"
    });
    MyFolder.Add(new MailItem
    {
        Id = "4",
        ParentId = "2",
        FolderName = "Social"
    });
    MyFolder.Add(new MailItem
    {
        Id = "5",
        ParentId = "2",
        FolderName = "Promotions"
    });
}
}