regarding streaming ..

Question

hi friends..

i am developing one application.. in that i added a particular text to a file successfully using stream writer concept..

my query is i want to delete the particular text from a file ..

for example in textbox in entered "google".. if that word is there in that text file means it will delete that word only.. remaining content of that file should not be deleted.. i know we use stream reader concept..

how to use the reader concept in that situation..

i need coding for that in c#..

thanx..
regards
gopal