how to use asp.net to read local file and display it in client browser

I want to use asp.net to acheive the following function
1>when client browser open some webpage and it the webpage automatically read a local txt file 
2>read txt file and process the conent,for examle find these lines including "@" and display all these lines in client browser
I am newer and know nothing about asp.net,hope someone tell me how to achieve these features,appreicate any help.
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