Data Search Algorithm

Question

Hi,

 

I am using c# .net VS2010 . i am Looking for Algorithm for fastest data Search like google Search. I have Data in text file which contain millions of records. 

Now my problem is I have one textbox  for user entry.when user types keyword data should be searched from text file and provide user autosuggestion to select record which should done fast.Please guide me which technique or Algorithm is good for this.Thanks in Advance.