How to Validate ejs-dropdownlist on button click

Question

<ejs-dropdownlist id="dropdownAddressTypeFilters" change="valueChange" ejs-for="FatcaViewModel.AddressTypeList.SelectedValue" 
                                              dataSource="@Model.FatcaViewModel.AddressTypeList.Items" popupHeight="300px"
                                              placeholder="Select Address Type" allowFiltering="true">
                                <e-dropdownlist-fields text="Text" value="Value" iconCss="Text"></e-dropdownlist-fields>
                            </ejs-dropdownlist>

<span asp-validation-for="FatcaViewModel.AddressTypeList.SelectedValue" class="validation-summary-errors text-danger"></span>

<input id="BtnSave" type="submit" class="rmbttn" value="Save" />

Validation not working