asp.net-4.0

I am new to ASP.Net 4.0, and have seen a new feature called Response.RedirectPermanent() . I have checked a few articles, but I'm unable to understand clearly the actual meaning and difference of Response.RedirectPermanent() over Response.Redirect() . According to Gunnar Peipman , Response.Redirect() returns 302 to browser meaning that asked resource is temporarily moved to other location. Permanent redirect means that browser gets 301 as response from server. In this case browser doesn’t ask the same resource from old URL anymore – it uses URL given by Location header. Why do I need to check

while hitting ESC key twice when on a page containing an update panel with a any control inside, say textbox or listbox im getting a System.ArgumentException: Invalid postback or callback argument . I have checked in remaining browsers its working fine but in Internet Explorer 8 its creating above said problem. the possible solution i found, is making EnableEventValidation="false" either at page level or webconfig or disabling escape key . i dont want to go with 2 former solutions as either my site security will compromise and i dont want my escape key to disable. Any Suggestions/Ideas

I've seen a lot of questions about this already, but I'm stumped! Please help! I have a customvalidator. It's firing but it's not preventing postback. Please help me in doing so! I can see that console.log registers before the post. But, it posts back anyway. How do I prevent the postback? I've tried adding a control to validate, and validate empty text equal to true. I also tried adding e.preventdefault, which did not work :( How can I prevent the postback? <script type="text/javascript"> //<![CDATA[ function validateWhyUnlikely(source, args) { console.log(1); args.isValid = false; } //]]>

I need to enable caching in my asp.net application, but I do not want to use the webserver's memory for holding cache objects. If I add the page directive for output caching will the page be stored in the asp.net cache object? Thanks! The default behaviour is to store the content in memory in the same way as HttpRuntime.Cache (actually in an internal HttpRuntime.CacheInternal which behaves similarly to the publicly visible cache), but in ASP.NET 4.0 you can write your own provider to store the content however you wish. This a nice introduction to implementing a provider and using it in your

We recently upgraded our web app from 3.5 to 4.0. Now after I login and load a page with Microsoft ScriptManager on it, I get: Could not load file or assembly 'System.Windows, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' or one of its dependencies. The system cannot find the file specified. It only happens the first time, reload the page and everything works. UPDATE: We have all Silverlight v4 projects.I found the System.Windows.dll in the C:\Program Files\Reference Assemblies\Microsoft\Framework\Silverlight\v4.0 directory. Why would it look for version 2.0? Here's the

So we've upgraded our site from 3.5 SP1 -> .NET 4. When we ran the site, we got an Internal Server Error (500), stating the following configuration group could not be read: <system.web.extensions> <scripting> <scriptResourceHandler enableCompression="true" enableCaching="true" /> <webServices> <jsonSerialization maxJsonLength="999999" /> </webServices> </scripting> </system.web.extensions> We commented out this section and the website ran fine (but now we are getting problems with JSON - because of the above required property). We've read threads on this issue, and most of them say "Your