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Removing (Deleting) Querystring in ASP.NET

, 7 Apr 2011 CPOL
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Removing (Deleting) Querystring in ASP.NET

We cannot delete a query string directly like below:

Request.QueryString.Remove("foo")

If you do this, you will get an error - collection is read-only. So, we need to write the below code before deleting the query string.

In C#:

PropertyInfo isreadonly = 
  typeof(System.Collections.Specialized.NameValueCollection).GetProperty(
  "IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);
// make collection editable
isreadonly.SetValue(this.Request.QueryString, false, null);
// remove
this.Request.QueryString.Remove("foo");

In VB.NET:

Dim isreadonly As PropertyInfo = _
  GetType(System.Collections.Specialized.NameValueCollection).GetProperty(_
  "IsReadOnly", BindingFlags.Instance Or BindingFlags.NonPublic)
 
' make collection editable
isreadonly.SetValue(Me.Request.QueryString, False, Nothing)
 
' remove
Me.Request.QueryString.Remove("foo")
I hope that this will help you guys.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Toniyo Jackson
Software Developer
India India
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Comments and Discussions

 
GeneralMy vote of 1 PinmemberMember 1087396227-Jun-14 8:58 
GeneralMy vote of 1 PinmemberMember 1087396227-Jun-14 8:56 
QuestionQuerstring Removal PinmemberMinu H18-Mar-13 0:46 
GeneralMy vote of 5 PinmemberLechu8117-Dec-12 7:11 
QuestionMy vote of 5 PinmemberGökmen BULUT6-Jun-12 0:50 
GeneralMy vote of 5 Pinmembernarenderkumardhull29-Apr-12 21:35 
GeneralRe: > Even though the unanimous vote is that the collection shou... PinmemberAnkur\m/12-Apr-11 19:29 
GeneralRe: > OP was talking about a single request Ah, that's what's h... PinmemberJeff Bowman12-Apr-11 8:46 
GeneralRe: :D <i>I'm not seeing how you're handling state here. Each p... PinmemberAnkur\m/11-Apr-11 22:48 
GeneralRe: Oh, I doubt myself daily ;-) I'm not seeing how you're han... PinmemberJeff Bowman11-Apr-11 22:31 
GeneralRe: Thanks for waiting. Let me tell this once again - Changing ... PinmemberAnkur\m/11-Apr-11 22:06 
GeneralRe: That'll be great, thanks, when you have time. I'd like to se... PinmemberJeff Bowman11-Apr-11 21:05 
GeneralRe: No I do not, but if you need I can write it for you. It is j... PinmemberAnkur\m/11-Apr-11 19:19 
GeneralRe: :thumbsup: Thank you. :) PinmemberToniyo Jackson8-Apr-11 1:29 
GeneralRe: That's the spirit! :thumbsup: Cheers! PinmemberAnkur\m/8-Apr-11 1:27 
GeneralRe: Anyway, my first Tip/Trick got failure. Will do best next ti... PinmemberToniyo Jackson8-Apr-11 1:16 
GeneralRe: No problem Ankur. You are correct. One day i was trying to d... PinmemberToniyo Jackson8-Apr-11 1:10 
GeneralRe: As I said, it is kept readonly for a reason, do not change t... PinmemberAnkur\m/8-Apr-11 1:00 
GeneralReason for my vote of 5 very good.. I was looking for this s... Pinmembermvamsianil5-Aug-11 0:04 
GeneralRe: Thanks :) PinmemberToniyo Jackson5-Aug-11 0:30 
GeneralNo problem Ankur. You are correct. One day i was trying to d... PinmemberToniyo Jackson8-Apr-11 1:09 
GeneralWhy would anyone do this? If something is made Readonly, it'... PinmemberAnkur\m/8-Apr-11 0:49 
GeneralRe: Still, its not bad to know how to delete querystring yes? :) PinmemberToniyo Jackson8-Apr-11 0:53 
GeneralRe: Hi Ankur, do you have a small snippet handy? Thanks. PinmemberJeff Bowman11-Apr-11 16:00 
GeneralI don't see any value in this Tip/Trick. I have read the rep... PinmemberVenkatesh Mookkan7-Apr-11 7:57 

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