<TelerikGrid OnRead="ReadItems" EditMode="GridEditMode.Incell"
                     @ref="@GridRef">
    <GridColumns>
      <GridEditDropDownColumn Field="Test1" Data="@Eval?.ListEvaluationTypes" Title="Title" Width="130px" OnChange="OnChangeModel" />
    </GridColumns>
</TelerikGrid>

   private TelerikGrid<EvaluationListDTO> GridRef { get; set; }

   protected async Task OnChangeModel(object model)
        {
            var item = (EvaluationListDTO)model;

            var state = GridRef?.GetState();

           //Save in the Database  

                // use the state to remove the edited item (close the editor)
                state.EditItem = null;
                state.OriginalEditItem = null;
                await GridRef.SetStateAsync(state);
        }