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Editorial Team
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Asked: 2026-06-17T22:49:19+00:00

I’m sure I’m over looking something simple, but I can’t remember to save my

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I’m sure I’m over looking something simple, but I can’t remember to save my life how to change a “GET” variable’s value.

For example, say I have the web address www.food.com/food.aspx?foodType=Healthy

I know Request.QueryString["foodType"] can be used to retrieve the value, but if I want to say, change “Healthy” to “Unhealthy“, how would I change the value on post back?

I’m using a on-click event right now for my button, but I am stuck on changing the value of “foodType.” I tried using Request.QueryString.Add("foodType", "UnHealthy"); but that did not work.

Any ideas?

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1 Answer

  1. Editorial Team

    I’m not sure what your use case is, but you cannot modify the collection. As @Grant mentioned already the collection is read only.

    If you use look at the source for HttpRequest it creates the QueryString collection like this:

    new HttpValueCollection(_queryStringText, true, true, Encoding.Default);

    That second parameter sets the collection as read only.

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