* Fix explanation: setting a default selected option
The current doc treats the second parameter of @Html.DropDownList() as a way to set the default selected option. It gives an example of choosing "Comedy" by default. In fact, the given example creates a second entry that says "Comedy" but has an empty value. I provided a correct example.
* Fix code: setting a default selected option
See commit note on /Docs/aspnet/mvc/overview/getting-started/introduction/adding-search.md
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