help me to capture part of a website not whole in C#.net

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hi all.i use this code to capture a website .

C#

string downloadString = client.DownloadString("http://www.google.com");

the thing that i want is near the first of the page.this site is an example.but in my website each page contain many elements that makes its heavy .i want to optimize my C# programe . i mean instead of capturing all webpage ,capture for example till div with a class of nav .

i know how to capture whole of it .but i do not want to use it.let explain it.i have a webpage that contain 50000 lines of code.my special code is in the first line.i want to know is there any way while downloading webpage , search for my code.when it see's the first line and detected that code , stop downloading rest of the page and just bring me the first line.in this cases you can download just one line not whole webpage.is there any way?

Posted 18-Feb-14 10:26am

Farshad72

Updated 19-Feb-14 3:05am

v2

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ZurdoDev 18-Feb-14 17:04pm

The only way I am familiar with is to parse it using regular string methods. Is there not a webservice available to give you what you need?

Farshad72 18-Feb-14 17:21pm

regular is used after we capture website,am i right?

ZurdoDev 18-Feb-14 17:22pm

Yes, I don't know of any way to only get a portion of the page initially. You'll have to get the whole string and then parse it.

Sergey Alexandrovich Kryukov 18-Feb-14 21:06pm

It sounds like you know how to capture whole Website. No, it is not the case. You don't. What's the problem? What have you tried so far?

—SA

Farshad72 19-Feb-14 1:49am

i know how to capture whole of it .but i do not want to use it.let explain it.i have a webpage that contain 50000 lines of code.my special code is in the first line.i want to know is there any way while downloading webpage , search for my code.when it see's the first line and detected that code , stop downloading rest of the page and just bring me the first line.in this cases you can download just one line not whole webpage.is there any way?

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Matt T Heffron · Answer 1 · 2014-02-18T11:25:00

Solution 1

Check out: HTML Agility Pack[^]
and articles here re: using it in various ways. (Code Project search)[^]

Posted 18-Feb-14 11:25am

Matt T Heffron

Comments

Farshad72 18-Feb-14 18:06pm

i'v checked first link.it is useful but i think it should be used after capturing whole site

Sergey Alexandrovich Kryukov · Answer 2 · 2014-02-18T15:08:00

Solution 2

You are interested in something called Web scraping: http://en.wikipedia.org/wiki/Web_scraping[^].

Please see my past answer: get specific data from web page[^].

See also this one: How to get the data from another site[^].

—SA

Posted 18-Feb-14 15:08pm

Sergey Alexandrovich Kryukov