Hi all,
Hope someone can help with this - I am tearing my hair (singular) out.
I developed an application using asp.net 2.0 and Mobile Controls. Up till now I have been testing it with a Pocket PC which runs a version of Internet Explorer.
I'm trying to use the application now on a Samsung SGH-F700W which uses a web browser called NetFront 3.3 (this is being supplied by Vodafone in the UK as their answer to the iPhone).
On several pages within the application I get the following error message:
"Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machine key> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster."
To save time, let me tell you some of the things I am aware of/have tried so far:
1. I am not using a web farm or cluster.
2. The application works find with Pocket PC.
3. I am aware that some mobile browsers limit the size of hidden fields and this may be screwing up the viewstate field. To this end, I have overridden the PageStatePersis ter property in my mobile forms, and am using the SessionStatePer sister. This has not resolved the problem.
4. I have tried adding:
<pages enableEventVali dation="false" viewStateEncryp tionMode ="Never" />
to my web.config file (although I am aware this is not recommended). This also does not solve the problem.
5. The browser does appear to be capable of supporting hidden fields, as I can see other hidden fields in the posted data.
Any ideas?
A more general question for those of you with more experience of a variety of mobile devices. Does anyone have an opinion on the use of viewstate in mobile applications that use Microsofts Mobile Controls? Is it just a bad idea? I would only have to support devices with an actual web browser that supports HTML, not mobile phones.
Thanks for any suggestions given!
Kind Regards
James
Hope someone can help with this - I am tearing my hair (singular) out.
I developed an application using asp.net 2.0 and Mobile Controls. Up till now I have been testing it with a Pocket PC which runs a version of Internet Explorer.
I'm trying to use the application now on a Samsung SGH-F700W which uses a web browser called NetFront 3.3 (this is being supplied by Vodafone in the UK as their answer to the iPhone).
On several pages within the application I get the following error message:
"Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machine key> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster."
To save time, let me tell you some of the things I am aware of/have tried so far:
1. I am not using a web farm or cluster.
2. The application works find with Pocket PC.
3. I am aware that some mobile browsers limit the size of hidden fields and this may be screwing up the viewstate field. To this end, I have overridden the PageStatePersis ter property in my mobile forms, and am using the SessionStatePer sister. This has not resolved the problem.
4. I have tried adding:
<pages enableEventVali dation="false" viewStateEncryp tionMode ="Never" />
to my web.config file (although I am aware this is not recommended). This also does not solve the problem.
5. The browser does appear to be capable of supporting hidden fields, as I can see other hidden fields in the posted data.
Any ideas?
A more general question for those of you with more experience of a variety of mobile devices. Does anyone have an opinion on the use of viewstate in mobile applications that use Microsofts Mobile Controls? Is it just a bad idea? I would only have to support devices with an actual web browser that supports HTML, not mobile phones.
Thanks for any suggestions given!
Kind Regards
James