C# Filtering datagrid without database

Question

I'm working on a project where I have to create an employee management system using Windows Forms Application in Visual Studio 2010.

I have been asked to not use any database for this project. I have to programatically add values into a datagridview and allow the user to filter out rows.

Eg: Filter names of the employees, filter employees who get paid more than $10,000, filter based on location, etc.

 

I have managed to populate the datagrid view with details.   I just don't understand how I could filter out the rows in the datagridview.

 

I decided to create a button called "Filter" in Form1.cs which would open up a different form just for filtering.

 

Any tips?