Thursday, June 25, 2009

Load Testing ASP.NET Sites with JMeter

Following my previous post about using JMeter to test MOSS, I tried to figure out what are the bare minimum requirements of using JMeter against a plain ASP.NET website.

I wrote a very simple ASP.NET web application with just a button, a text fields and a static label. This application displays the content of a text file in the static label when it loads and write content of the text field back to the file when the button is clicked.

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I found all I need to do in order to script this using JMeter is to extract __VIEWSTATE and __EVENTVALIDATION fields then send them back in the update request. My JMeter test plain looks like this:

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12 comments:

  1. Great Article, I have one question.

    How can you make Jmeter click the button?

    ReplyDelete
    Replies
    1. You can click button with WebDriver Sampler, which is Selenium based plugin for Jmeter. But you should note that Selenium is not for load testing and it's not recommended to use WebDriver sampler with more than 10 users.

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  2. Hi,

    Nope you can't, all JMeter does is record and play back HTTP traffic. You will need to use selenium (http://seleniumhq.org/) for something like that.

    Cheers,
    Oscar

    ReplyDelete
  3. Hi Oscar,

    I actually was able to "click" the button in jmeter.

    1. Run the page once and view the HTM source to obtain the viewstate information and eventvalidation.

    2. Disable your steps for 'Extract Event Validation" and "Extract View State"

    3. In the Http request sampler for your page, change the method to "Post" and in the "send parameters with the request" section add the follwing parameters:

    Name/Value

    __VIEWSTATE/copy your viewstate and check the encode button

    __Eventvalidation/copy your event validation and check the encode button

    TextBox1/"leave empty"

    Button1/Click+Me

    In my sample which is similar to yours I will see in the View Results tree my Http response 200 and the value "Hello world" in the resulting html for the textbox.

    Rich aka anonymous

    ReplyDelete
  4. Hi Rich,

    Thanks for the info, that's pretty cool.

    Cheers,
    Oscar

    ReplyDelete
  5. Hi Oscar,
    I tried to enable click event according to Rich's procedure. But I can't. Any suggestion?

    Note: I didn't find any __Eventvalidation in the page i tried.

    --Nazia

    ReplyDelete
  6. Hi Nazia,

    I never tried Rich's idea out myself so you might have to figure it out yourself, sorry.

    Are you testing a classic ASP.NET or an ASP.NET MVC application? The __EventValidation property is only for classic ASP.NET, you won't have that if you are testing an ASP.NET MVC app.

    Oscar

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  7. Thank you for this post. It has help me as a VERY Newbie to JMeter!

    -Franklin

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  8. will jmeter supports asp.net,C# and https environments pls....

    ReplyDelete
  9. Hi,

    JMeter is agnostic of server side programming language since it operates at browser level, so yes it will work with C# and I've showed you how to use it with ASP.NET.

    As for HTTPS, JMeter does support HTTPS but you need to do some extra configuration as described here: http://jmeter.apache.org/usermanual/get-started.html#opt_ssl.

    Oscar

    ReplyDelete
  10. Excellent Post. Also visit http://whiteboxqa.com/#performance.php

    ReplyDelete
  11. How can I create JMeter scenario for testing ASP.NET pages - default page is login page with "Username" and "Password" fields (for entering username/password values) and [Login] button.
    These field are named in web form like "tbUsername", "tbPassword" and "btLogin".
    Firstly I need observe value "__VIEWSTATE" (from default page before login process) (is possible to use previous advance in this article), and values "__EVENTTARGET" and "__EVENTARGUMENT".
    And then?
    Have somebody some tips (or sample jmx-file)?

    ReplyDelete