Searching For Data In A Console App?

Csharp Code: ..........

I wrote a console app that displays information from a local file on my desktop and displays the content within the file. I was wondering how can I create a function that can search for keywords and only display the words, I want it to search for?I'm trying to display this content in a database and search for the content I want it to display.

* ZIP Codes
* Area Codes
* City Name
* State Name
* Two digit State Code
* City Type
* City Alias Abbrev.
* County Name
* State FIPS
* County FIPS
* Time Zone
* Daylight Savings Indicator
* Number of Businesses
* Q1 Payroll
* Annual Payroll
* Number of Employees
* Employment Flag
* County Growth Rate

I tried something like this - And it didn't work.

Csharp Code:
var keywords = new string[] {"some", "keywords"}; var foundKeywords = File.ReadAllLines("filename"). SelectMany(line => keywords.Where(keyword => line.Contains(keyword))). Distinct();