This sample demonstrates the template driven form support of the DropDownList.  You can choose an item or type a value in the DropDownList. Both values goes into the ng models. 
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Description

 The DropDownList will be registered with an NgForm directive with bind [(ngModel)] and name attributes. Then you can confirm that two-way data binding will works. For more information about Template Driven Forms forms can be found in this  reference link.