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I am trying to retrieve width of my browser in pixels but for some reason I am getting back 640, my resolution is at 1240.

Code I am using is Request.Browser.ScreenPixelsWidth

Does anyone knows why it returns 640 always or if there is another way for me to get the width of the browser upon page load?

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    So you want the client's browser width within the code you're executing on the server? Commented May 24, 2013 at 19:16
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    you can get those values in Javascript and pass them on to the server.. see this page responsejs.com/labs/dimensions Commented May 24, 2013 at 19:20
  • Plus you're asking for the browser width but trying to detect the screen width - which is it you want as they are not always the same ;) Commented May 24, 2013 at 19:55
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    @Amitd do you have an example of how to pass those js values to the server? Commented Feb 26, 2014 at 19:40
  • @Cole try this answer stackoverflow.com/questions/11628859/… Commented Mar 1, 2014 at 14:38

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You need to populate a hidden field with Javascript (see this question for how to do that), and then send that field back to the server so that it's avaialble within ASP.NET.

ASP.NET is incapable of reading detailed browser information like that directly (you're talking about sending some very specific information from the client's browser to the ASP.NET server where your application is hosted, and there are a lot of problems involved with doing something like that).

See this similar, but less detailed, question:

Asp.Net Get Screen Width

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13 Comments

I don't quite understand how they are doing it, would you be able to give me a line of code that will allow me to get the browser width and put it in a c# variable for my use?
No, that's what I'm trying to tell you, it's not possible without setting up some Javascript on the page, a hidden ASP.NET input field, and a way to retrieve the value from that hidden field via C#. It's a lot more than one line.
can you then tell me how do I pass a value into the lets say a hidden label through jQuery? which has an ID of "test"
Within your document.ready function: $('#test').html($(window).width()); - will set the label's inner HTML to be the width of the browser window.
I tried that, however my c# is not detecting it. here is what I tried. - $('#myP').text($(window).width()); - then ASP.NET - <p id="myP" runat="server" name="myP"></p> - then c# - lblTestLabel.Text = myP.InnerText; the value displayed of the test label is nothing, the value displayed of the p is the pixel width - I also tried innerhtml, same thing.
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try this 

int x = (Request.Browser.ScreenPixelsWidth)*2-100;

you can set width according to your requirement

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The documentation on ScreenPixelsWidth says "The approximate width of the display, in pixels.". It is based on "default font sizes", "device-specific sizes" and other data. So the value is very unreliable. But it is the asssumed width of the display, in pixels. Converting it so it works for this example does not make it generally correct. I tested for different screen sizes and ScreenPixelsWidth always returned 640. Your calculation would be wrong for all this cases. It is only correct if the screen width is 1240 so you could hardcode the value 1240 as well.

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