Use static property binding for the DropDownList

src/app/app.component.html

@@ -1,7 +1,7 @@
 <h1>Hello Kendo UI Angular!</h1>
 
 <p>
-  <kendo-dropdownlist [data]="dropDownItems" [textField]="'text'" [valueField]="'value'" [defaultItem]="defaultItem"
+  <kendo-dropdownlist [data]="dropDownItems" textField="text" valueField="value" [defaultItem]="defaultItem"
     (valueChange)="handleFilterChange($event)">
   </kendo-dropdownlist>
 </p>