Using the razor delete method

hello i need to delete the model for excel i uploaded i get an error on click event how can i do i am using razor

  EmployeeService:
         public async Task<int> DeleteAsync(Employee dto)
                {
                        var result = await _employeeRepository.DeleteAsync(dto.ToDataModel());
                        return result;
                }`
    razor :
    [Parameter]
    public CapabilityUtilizationViewModel? Model { get; set; }
         
    private async Task DeleteClick()
            {
                _btnLoading = true;
        
                var res = await _http.DeleteAsync($"Employee/{Model}");
        
                if (res.IsSuccessStatusCode)
                {
                    _toast.ShowSuccess("Employee was delete!");
                    await Modal?.CloseAsync(ModalResult.Ok(Model))!;
                }
        
                else
                    _toast.ShowError("Error on delete employee!");
        
                _btnLoading = false;
            }