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Editorial Team
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Asked: 2026-05-13T15:29:05+00:00

I am trying to request a webpage from an iis web server that I

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I am trying to request a webpage from an iis web server that I control utilising query strings.

E.g., I have a webbrowser control in my winforms app and request a page similar to “www.site.com/getpage.ashx?field=afsfgwesar+sere”

When i try to run this it fails because on the server side, getpage.ashx can’t locate the right field.

After much hair pulling I have figured out that the string has actually changed from what was sent to the browser and what was received – i.e. – the plus symbol is missing when the server starts working with it.

It begins as “afsfgwesar+sere” and ends as “afsfgwesarsere”. So somewhere along the line the string is being reformatted?

This is how I am getting the string on the server side – 

string field = (string)context.Request.QueryString["field"];

It is at this point I have stepped in and seen the missing plus symbol.

Does anyone know why I am losing the plus symbol and how I can get it back?

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1 Answer

  1. Editorial Team

    The plus sign is a reserved character in querystrings. It is often interpreted as a space character. Just have a look at a search engine and you’ll notice this.

    You can prevent this by encoding the afsfgwesar+sere text before adding it to the querystring. Use HttpUtility.UrlEncode to do so. Use HttpUtility.UrlDecode to read it back.

    For more info, read:
    http://msdn.microsoft.com/en-us/library/4fkewx0t.aspx

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