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 1611
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.u k> 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.QuerySt ring("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.u k> 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*******@disc ussions.microso ft.com> wrote in message
news:0b******** *************** *****@phx.gbl.. . I get the error when I try to do this:
Dim sID As String sID = Request.QuerySt ring("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.u k> 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
. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: momo |
last post by:
Hello Newsgroup,
I want to pass a Request.Form variable to an ASP form, through the url
for example lets say i have a form with a textfiled called "txtName" if i
click the submit button for example the asp page reads the content of this
txtName as Request.Form("txtName")
I want to achieve that the asp form is accessed through a URL...
|
by: Max |
last post by:
Hello. This is the first time I've posted to a newsgroup, and I do
this because I'm in desperate need of help.
I'm working a user management system, and when I activate a user that
has registered to my system, the current admin user logged in gets
logged out.
I can't seem to work out how - I can't even trace back where some of
the variables...
|
by: Ivan |
last post by:
hi,
I saw some program using "request("fieldname") " instead of
"request.QueryString" to get the value from URL, what's the different ??
thanks
|
by: Anders Borum |
last post by:
Hello!
I would like to request a new method on the XsltArgumentList class, allowing
developers to check the presense of a key/value pair. If you try to add a
key/value pair that has already been defined in the list, an exception is
thrown.
Rather than using the "GetParam" method, it would be usefull to have a
method called ".Exists"...
|
by: FD |
last post by:
For performance reason, the follwoing code (C#) to capture
all the Request collection contexts is NOT recommended:
string ID = Request.QueryString;
But how to Capture the individual Request properties
needed in the application?
Thanks,
FD
| |
by: Steve |
last post by:
Hi-
I'd like to set values in the QueryString if I detect that a user submits a
bad value, say... ?id=333 where there is no id '333', I would like to set it
to '0' for example.
I tried to use Request.QueryString.Set("id", "0");
it says it is Read Only. How can this be done? Why is there a Set() method
if you can't use it?
|
by: mahsa |
last post by:
Hi have have some link like thi
http://x.com/Shoppingcart.aspx?pn=ps50210&qty_ps50210=1&pn=excel&qty_excel=1&pn=l4504000&qty_l4504000=1&sku=PS50210&cat=laminate&action=updat
now I want to request the dat
I use this code in as
<%For Each strPartNo In Request.QueryString("pn"
lngQty = Request.QueryString("qty_" & strPartNo
strPartNo =...
|
by: Guoqi Zheng |
last post by:
On my application, I need to have different action based on the pass in
query string. When the query string is not presented, I try to use
If request.querystring("id") ="" THEN ......
This is what I did in trational asp, however if I did abov in ASP.NET, I
always got an error of "Object reference not set to an instance of an
object. "
...
|
by: Ammar |
last post by:
Dear All,
I'm facing a small problem.
I have a portal web site, that contains articles, for each article, the end
user can send a comment about the article.
The problem is:
I the comment length is more that 1249 bytes, then the progress bar of the
browser will move too slow and then displaying that the page not found!!!!
If the message is...
|
by: =?Utf-8?B?QVRT?= |
last post by:
HOWTO Make CStr for JavaScript on ASP w/ Request.Form and QueryString
In ASP, Request.Form and Request.QueryString return objects that do not
support "toString", or any JavaScript string operation on parameters not
passed.
Example: Make a TST.asp and post to it as TST.asp?STATE=TEST
<%@ Language=JavaScript %>
<%
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main...
| |
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
| |
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
|
by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating...
| |