title: Searching file content
body: <p>I have a folder with lot of files like doc, excel, ppt etc. Once the user selects a category from the combo I have assigned keywords related to the particular selection. My wpf application has to search the entire folder and content of the files for the key words and display the matching files in a gridview. Speed and performance also has to be maintained</p>
  
  <p>How should I code this functionality?</p>