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Removing (Deleting) Querystring in ASP.NET

, 7 Apr 2011
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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 7:58 
GeneralMy vote of 1 PinmemberMember 1087396227-Jun-14 7:56 
QuestionQuerstring Removal PinmemberMinu H17-Mar-13 23:46 
GeneralMy vote of 5 PinmemberLechu8117-Dec-12 6:11 
QuestionMy vote of 5 PinmemberGökmen BULUT5-Jun-12 23:50 
GeneralMy vote of 5 Pinmembernarenderkumardhull29-Apr-12 20:35 
GeneralRe: > Even though the unanimous vote is that the collection shou... PinmemberAnkur\m/12-Apr-11 18:29 
GeneralRe: > OP was talking about a single request Ah, that's what's h... PinmemberJeff Bowman12-Apr-11 7:46 
> OP was talking about a single request
 
Ah, that's what's happened. We're talking about two different things Smile | :)
 
I read the thread too quickly. Based on Venkatesh's reply, I misunderstood this topic to address the problem of how to detect a page refresh and not initiate a duplicate action.
 
So now your technique makes sense Smile | :)
 

_____
p.s. Even though the unanimous vote is that the collection should stay read-only, I think OP was pretty clever to dig in and come up with that approach. Albeit misguided, it shows initiative Wink | ;-)
GeneralRe: :D <i>I'm not seeing how you're handling state here. Each p... PinmemberAnkur\m/11-Apr-11 21:48 
GeneralRe: Oh, I doubt myself daily ;-) I'm not seeing how you're han... PinmemberJeff Bowman11-Apr-11 21:31 

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