getting this "potentiall y dangerous Request.Form value was detected"
exception with a textbox which I have populated with some source
code. I think I am getting the exception when I click OK on the web
page, but that is one of my question, so I am not sure ;)
I am reading how to disable request validation, http://www.asp.net/faq/RequestValidation.aspx#5
but I dont want to do that. I would rather catch the exception. But I
guess that is not workable because at the time the validation
exception is thrown, the individual control with the invalid data is
not yet know. correct?
should I Server.HtmlEnco de the data I put in the textbox before
posting to the browser? If I do that the data will display in encoded
form ( correct? ) and I dont want that.
how do I accept textbox input from a form that fails RequestValidati on
without disabling that validation?
thanks,
-Steve 2  4173 
request validation is looking for script and html attacks. so typing a
"<" or "&#" in a textbox will fire this error on postback. each control
checks this when it loads the postback data. as this is a page event,
you can only catch the error with a global error handler.
if validation is on, you should never set Text of a webcontrol to these
character. if you htmlencode, the browser will convert to the correct
values, but will cause a postback error.
there is no way to display these values in a textbox and postback unless
you turn off validation.
-- bruce (sqlwork.com)
Steve Richter wrote:
getting this "potentiall y dangerous Request.Form value was detected"
exception with a textbox which I have populated with some source
code. I think I am getting the exception when I click OK on the web
page, but that is one of my question, so I am not sure ;)
I am reading how to disable request validation,
http://www.asp.net/faq/RequestValidation.aspx#5
but I dont want to do that. I would rather catch the exception. But I
guess that is not workable because at the time the validation
exception is thrown, the individual control with the invalid data is
not yet know. correct?
should I Server.HtmlEnco de the data I put in the textbox before
posting to the browser? If I do that the data will display in encoded
form ( correct? ) and I dont want that.
how do I accept textbox input from a form that fails RequestValidati on
without disabling that validation?
thanks,
-Steve
On Jun 26, 6:24 pm, bruce barker <nos...@nospam. comwrote:
request validation is looking for script and html attacks. so typing a
"<" or "&#" in a textbox will fire this error on postback. each control
checks this when it loads the postback data. as this is a page event,
you can only catch the error with a global error handler.
if validation is on, you should never set Text of a webcontrol to these
character. if you htmlencode, the browser will convert to the correct
values, but will cause a postback error.
there is no way to display these values in a textbox and postback unless
you turn off validation.
ok. thank you. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Anil Kripalani |
last post by:
When a user of our ASP.NET 1.1 application submits a form with the phrase
'manuscript:' in a text field, ASP returns the error 'A potentially
dangerous Request.Form value was detected from the client
(182:BodyField="manuscript: hello").' Why is this seemingly innocent text
triggering this error?
Thanks,
Krip
|
by: John Morgan |
last post by:
I am attempting to use a try/catch block to trap a querystring which
is caught by ValidateRequest="true" in the @page directive
A simple example of the blockthat does not work is
Try
routeID = Request.QueryString("routeID")
Catch
response.Write("a dangerous query string has been entered")
End Try
|
by: angus |
last post by:
Dear All,
how to try-catch "A potentially dangerous Request.Form value was detected
from the client (txtUserName="<asdf")."
this exception?
i've set the debugger in the Page_InIt function, but this page is shown
before the Page_init function.
i know that i can set validateRequest="false" in my page, but how can i
|
by: STech |
last post by:
If data you post back contains the following string
on<<any sequence of characters>>=
example: on2q3asdf=
The page will throw the following exception:
A potentially dangerous Request.Form value was detected from the client
|
by: veenakj |
last post by:
Hi
Code snippet
--------------
strErrMsg = "Could not find a part of the path
\"C:\\Temp\\data\\Test.xml\"." }
Server.Transfer("Message.aspx?errormsg=" + Server.UrlEncode(lsErrMsg));
---------------
| | |
by: randy collins |
last post by:
I have a <BUTTON> control that I use, because I want the text on the button
to display with an underscore on the lead character to indicate that it has
an access key associated with it. To do this I use the HTML underline tag:
<BUTTON><u>S</u>ave</BUTTON>. However, when this form is posted in ASP.NET
2.0, I get the error mentioned in the subject of this post. Is there any way
to work around this short of disabling the ASP.NET form...
|
by: Sergey Zuyev |
last post by:
Hello all
I have simple edit form. When user saves data that contains restricted
characters such as (< , etc.) , regular expression validator will display
a warning message. It all works fine, but if users decides to exit the form
using Cancel button then error occurs: A potentially dangerous Request.Form
value was detected from the client. The Cancel button has CausesValidation
set to false.
Is there any way to avoid this error...
|
by: arun |
last post by:
Hi
I want to store the text from a TextBox that contains <br, *, $
etc.to sql server. But it shows me an error message "A potentially
dangerous Request.Form value was detected from the client
(ctl00$ContentPlaceHolder1$Comments="...rts from: <br>14:15 Bus Stop
1..."). "
If the text does not contain these special characters it gets inserted
with out any problem.
|
by: djmc |
last post by:
Using the asp.net button control (and I assume others), I place the phrase
"Don't Save" in the .Text field. The button displays without any problems,
but upon postback, the server responds with "A potentially dangerous
Request.Form value was detected". I've determined this problem is due to
the single quote in the string.
My main problem occurs when trying to localize our application. In many
foreign languages, the apostrophe is used...
|
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 usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
| | |
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
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 choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
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 launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
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 the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
|
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 effective websites that not only look great but also perform exceptionally well. In this comprehensive...
| |
