Unable to update the EntitySet because it has a DefiningQuery and no <UpdateFunction> element exists in the <ModificationFunctionMapping> element to support the current operation

It’s likely because you haven’t set a primary key in your database and/or edmx

Sometimes I feel tables (join tables) don’t need primary keys but it seems wise to just bite the bullet and add it for EF sake.  Though for a join table you could simply delete/insert instead of updating it and forgo the key.

Solution is to add the primary key and then remove the table from your edmx.  Then right click and” update model from database …”

Done and done!

In case you ran into this problem I had to remove the change I made to the editor for cshtml files (which I did to get some syntax highlighting)

Tools -> Options -> Text Editor -> File Extensions
remove the alteration to cshtml files

Also I’ve heard that resharper overrides the completion and can keep razor intellisense from working
Tools -> Options -> Text Editor -> All Languages
make sure statement completion is turned on

Hope this helps!

There are a couple tweaks I can recommend and so as much to remind myself as to inform others here they are.

On install I typically choose the default environment settings even through I’m 90% doing c# dev (web and software).  I find it to be more balanced than the other choices.

Common Shortcuts (needed)

Tools -> Options -> Environment -> Keyboard

Visual C# – to start off with

I’ve added the following changes:

1. File.Close – ctrl + w (similar to how modern browsers close tabs)
2. FindinSolutionExplorer – ctrl + alt + l (Locate the file in your solution explorer)
   1. Edit: above didn’t work after uninstalling an extension or something so I’ve resorted to adding a macro (works quite the same)
      

Settings

I can’t stand the solution explorer jumping around as I switch from file to file so …

Tools -> Options ->Project Solutions -> General : unchecked track active item in Solution Explorer (see ctrl + alt +l in shortcuts)

Theme aka fonts and colors for editor

Currently I’m using http://studiostyl.es/schemes/bespin

In the past I’ve used http://studiostyl.es/schemes/wekeroad-ink

You can find tons of themes for visual studio at http://studiostyl.es/

Image via Wikipedia

Note: Evidently Snuck isn’t a real word and we Americans should stop using it.

Google Instant was released recently and certainly changes the way I perceive search.  Seemingly Google sees this as the path going forward and that in the not so distant future “we’ll look back and wonder how search was ever any other way“.  Personally I like the ability to use the down arrow to check what the other suggested search terms provide as results.  It also makes the site feel more lively and fresh.  Oh and it’s the same great search results.

I wonder however how many Google users are even seeing the Google home page?  So many of my colleagues claim to use Google toolbar from their favorite browser.  Or their using Google Chrome‘s omnibox to search from the same place as you’d normally type an address.  Will Google integrate instant search with their browser?  At this point I don’t see this making them more revenue based sheerly on more searches due to 5 to 7 times the searches.  However if this feature, if I can call it that, helps to curb attrition to the likes of Bing and Yahoo and even helps to capture back 1% of market share recently lost it could be a huge win for them.

Perhaps the average user will perform more searches because it’s faster to do so.  I’m curious to know how this effects Google’s monetization per search.  The NFL’s opening game is tonight and I’d be smitten not to mention my boys the Washington Redskins!  I tested typing ‘Washington Redskins” using instant search it performs 2 where it would have normally waited for my return key to be pressed and performed 1.  One search kicked off as I typed for ‘Washington Post’ which is seemingly the highest rated suggestion and then another for ‘Washington Redskins’.  I wasn’t even interested in the WP and so any results or ads that surfaced their were no good to me.  Whamo does this instantly (pun intended) lower the current CPM that folks are paying Google?  Perhaps the results page is only operating as a CPC generator and their is no worry here.

The modern man (and woman) wants it all we want it now!  Perhaps instant is just what the search doctor ordered.  If this helps to allow even more of the best sites and content rise to the top.  I’m all for it!

-Phil

follow me @philstrong

Stumbled onto this one!

Long live the service that lala gave us. Those guys really knew what they were doing. As a social web developer I have some sense of how hard it is to build something that not only works but that draws such a vibrant community.

I am wondering if Apple is going to continue to use lala’s flash music player! Can Steve Jobs allow for that? Just not sure what tech they would use to do this well other than flash

We also really liked that EF was moving toward a direction that allowed for testing and the ability to mock the context object (it implemented an interface)

In the past I’ve used stored procedures with multiple result sets for gnarly tasks that seemed better suited in TSQL.  Linq2Sql allowed for stored procs with linq2sql

It does appear that EF has an extension library that will allow for this.

Today during this search I come across this article that states Linq2Sql may not be dead after all.

I agree with everything this post says.  I keep finding myself asking why don’t we go back to Linq2Sql … maybe just for calling stored procedures.

Please comment with your thoughts and let me know what you’ve experienced and recommend.

When I published my app to run it locally in IIS (localhost:80) I get:

"Validation of ViewState MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies <machineKey> the same validationKey and validation algorithm. Self can not be used in a cluster."

After a bunch of googling I realized that it had to do with viewstate which lead me to the concept that it must have to do w/ the anti forgery token since by definition MVC doesn’t use viewstate outside of that.

I then quickly came the conclusion that the token is dropping and reading a cookie; as it turns out localhost doesn’t differentiate between ports and so it was reading my cassini (8080) token and trying to use it w/ my IIS application (80).

Long story short remove your cookie __RequestVerificationToken_Lw__ and all will be well

Hopefully this will help others get past this issue in less time than it took me (~ an hour)

http://www.techcrunch.com/2009/07/14/youtube-will-be-next-to-kiss-ie6-support-goodbye/