ADO.NET :: Update A Column For All Rows In A Collection Using Linq?

Jul 28, 2010

is there a way to update a column for all rows in a collection using linq like sql does it

eg. UPDATE myTable SET myColumn='newValue'

Also weighing options as to whether there is better performance using linq to sql for this or straight sql to DB via table adapters etc.

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[Code] ....

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Using VS2005, VB code behind,

I am extending the GridView control to include a custom pager for a custom paging scheme (only one page returned from the database at a time rather than all records). In my testing a discovered an issue - on my last page of data, the GridView's rows property always returns a collection of PageSize page, rather than the actual number of records on the page, with non-data fill records being empty rows.

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Snippets from my extended GrdiView




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I have been trying to design a form, which uses a view model that contains an object array. I want to set up this form so that when the submit button is clicked, all the members of the array are updated. Here is my code:

The class definition of the array element:


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This is part of a larger problem which has plagued me for a while now (see "EntityCollection already initialized" error with entity as model in Asp.Net MVC? for the entire picture).

But I found a web site with someone who had faced a similar problem and apparently solved it for his needs [URL]. I tried it, but had to make some modifications to fit my code, and the helper methods supplied by a tutorial by Steven Sanderson (see previous post).

I'm very close it seems, but not quite:

UpdateModel(consultant, "Consultant");
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Although this follows the example on the site above, and the modelProgram does get updated with the changed properties, these values are not saved to the database on _repository.Save() on the Consultant object, even though the modelProgram object is a reference to a Program object on the Consultant... What am I doing wrong?

I am using the Entity Framework by the way, if it isn't clear.

(BTW, if anyone has any input on the previous question and the whole picture, that would be welcome too, it is still unresolved).

UPDATE: There was apparently a mistake in here: UpdateModel didn't actually do any updating, I had just referenced a different object (the one in the viewmodel) for the modelProgram, so of course it had the right property values. I still want ideas for how to achieve this though...

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@DepartmentId int,
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