Select one or more rows

Right click another of the rows (there is code in the OnContextMenu handler that changes the selected items to the currently clicked row)

<TelerikContextMenu @ref="@ContextMenuRef" Data="@MenuItems" OnClick="@((MenuItem item) => OnItemClick(item))"></TelerikContextMenu>

<TelerikGrid Data=@GridData
             @ref="Grid"
             SelectionMode="GridSelectionMode.Multiple"
             @bind-SelectedItems="@SelectedEmployees"
             @bind-Page="@CurrentPage"
             PageSize="@PageSize"
             OnRowContextMenu="OnContextMenu"
             Pageable="true">
    <GridColumns>
        <GridCheckboxColumn />
        <GridColumn Field=@nameof(Employee.EmployeeId) />
        <GridColumn Field=@nameof(Employee.Name) />
        <GridColumn Field=@nameof(Employee.Team) />
    </GridColumns>
</TelerikGrid>

@if (SelectedEmployees != null)
{
    <ul>
        @foreach (Employee employee in SelectedEmployees.OrderBy(e => e.EmployeeId))
        {
            <li>
                @employee.EmployeeId
            </li>
        }
    </ul>}

@code {
    public IEnumerable<Employee> SelectedEmployees { get; set; } = Enumerable.Empty<Employee>();
    TelerikContextMenu<MenuItem> ContextMenuRef { get; set; }
    TelerikGrid<Employee> Grid { get; set; }
    List<MenuItem> MenuItems { get; set; }
    int CurrentPage { get; set; } = 1;
    int PageSize { get; set; } = 5;

    //data binding and sample data
    public List<Employee> GridData { get; set; }

    protected override void OnInitialized()
    {
        GridData = new List<Employee>();
        for (int i = 0; i < 15; i++)
        {
            GridData.Add(new Employee()
            {
                EmployeeId = i,
                Name = "Employee " + i.ToString(),
                Team = "Team " + i % 3
            });
        }

        MenuItems = new List<MenuItem>()
    {
            new MenuItem(){ Text = "Delete", Icon = IconName.Delete, CommandName = "Delete"}
        };
    }

    protected async Task OnItemClick(MenuItem item)
    {
        if (item.Action != null)
        {
            item.Action.Invoke();
        }
        else
        {
            switch (item.CommandName)
            {
                case "Delete":
                    await Task.Delay(1); // do something

                    break;
            }
        }
    }

    protected async Task OnContextMenu(GridRowClickEventArgs args)
    {
        if (!(args.Item is Employee employee))
            return;

        SelectedEmployees = new List<Employee> { employee }; // this does not work

        if (args.EventArgs is MouseEventArgs mouseEventArgs)
        {
            await ContextMenuRef.ShowAsync(mouseEventArgs.ClientX, mouseEventArgs.ClientY);
        }
    }

    public class Employee
    {
        public int EmployeeId { get; set; }
        public string Name { get; set; }
        public string Team { get; set; }
    }

    public class MenuItem
    {
        public string Text { get; set; }
        public string Icon { get; set; }
        public Action Action { get; set; }
        public string CommandName { get; set; }
    }
}

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