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Is there a way to check for a specific variable in a query string?  (ASP.NET VB)

Posted on 2005-03-31
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Last Modified: 2010-04-07
I want use a variable/parameter being passed in a query string which should always be present.. however if someone manually removes this or it is somehow not passed I want to redirect the person to another page.  The value of the variable is easy enough to get via Request.QueryString("sd") but how would I test if sd is present in the query string.  I know there are methods to count the number of variables in the query string but I want to test specifically for the presence or lack there of for sd.
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Question by:egdigital
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LVL 20

Expert Comment

by:ihenry
ID: 13678287
A simple checking condition as shown below will do the job

If Request.QueryString("sd") Is Nothing Then
   ' sd is not present
End If

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Author Comment

by:egdigital
ID: 13722168
Does this apply to:

1. page1.aspx?sd=122222  (Is not nothing)
2. page1.aspx?sd=   (Is nothing?)
3. page1.aspx (how does that code handle this scenario?)


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Accepted Solution

by:
ihenry earned 200 total points
ID: 13723187
1. yes
2. yes
3. Request.QueryString.Count = 0
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Author Comment

by:egdigital
ID: 13723204
Great, thanks ihenry
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