Hi All,
This problem is really annoying me, as I am sure there is
a simple solution to it.
If I try to read a querystring value in the Page_Load
event and that querystring does not exist I get the error:
Object reference not set to an instance of an object
How do I check if the querystring is there before I try
to use it in my code?
Thanks,
Steve 4 1585
Indexing into the querystring object doesn't fail. It is something you are
doing with the result of that, that is failing, such as calling Substring,
or using it elsewhere.
"Steve" <ms**@zuna.co.uk> wrote in message
news:02****************************@phx.gbl... Hi All,
This problem is really annoying me, as I am sure there is a simple solution to it.
If I try to read a querystring value in the Page_Load event and that querystring does not exist I get the error:
Object reference not set to an instance of an object
How do I check if the querystring is there before I try to use it in my code?
Thanks, Steve
Before accessing your querystring value use
Request.Params.Get["<Your Parameter>"] != null
to check if those exists.
Thanks,
-Shan -----Original Message----- Hi All,
This problem is really annoying me, as I am sure there is a simple solution to it.
If I try to read a querystring value in the Page_Load event and that querystring does not exist I get the error:
Object reference not set to an instance of an object
How do I check if the querystring is there before I try to use it in my code?
Thanks, Steve .
I get the error when I try to do this:
Dim sID As String
sID = Request.QueryString("id")
If sID.Length > 0 Then
--- my code ---
Should I be doing it another way?
Steve -----Original Message----- Indexing into the querystring object doesn't fail. It
is something you aredoing with the result of that, that is failing, such as
calling Substring,or using it elsewhere.
"Steve" <ms**@zuna.co.uk> wrote in message news:02****************************@phx.gbl... Hi All,
This problem is really annoying me, as I am sure there
is a simple solution to it.
If I try to read a querystring value in the Page_Load event and that querystring does not exist I get the
error: Object reference not set to an instance of an object
How do I check if the querystring is there before I try to use it in my code?
Thanks, Steve
.
Well, there you go. You are trying to access the Length property of a
string variable that is set to Nothing. So the QueryString is working just
fine - it does not cause problems, it returns Nothing if 'id' isn't there..
You need to check if sID is nothing or not, before you try to do anything
with it:
If Not IsNothing(sID) Then
....
"Steve" <an*******@discussions.microsoft.com> wrote in message
news:0b****************************@phx.gbl... I get the error when I try to do this:
Dim sID As String sID = Request.QueryString("id") If sID.Length > 0 Then --- my code ---
Should I be doing it another way?
Steve
-----Original Message----- Indexing into the querystring object doesn't fail. It is something you aredoing with the result of that, that is failing, such as calling Substring,or using it elsewhere.
"Steve" <ms**@zuna.co.uk> wrote in message news:02****************************@phx.gbl... Hi All,
This problem is really annoying me, as I am sure there is a simple solution to it.
If I try to read a querystring value in the Page_Load event and that querystring does not exist I get the error: Object reference not set to an instance of an object
How do I check if the querystring is there before I try to use it in my code?
Thanks, Steve
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