ADO.NET, LINQ, DataSet and other fun .NET technology : LINQ

Tech Ed

Erick Thompson — Fri, 30 May 2008 19:28:00 GMT

I'm currently down in sunny Orlando, getting ready for Tech Ed (or is it TechEd? That dot between letters is a very odd thing). I'm going to be presenting on LINQ to DataSet, and Understanding the Entity Framework. As usual, I have far too much material...(read more)

EnumerableRowCollection Type

Erick Thompson — Wed, 07 Nov 2007 04:40:00 GMT

If you've been playing with LINQ to DataSet, you may have noticed the EnumerableRowCollection type. For example, if you have a query like the following, the type of query is EnumerableRowCollection. var query = from row in ds.Tables[0].AsEnumerable()...(read more)

LINQ to DataSet Data Binding – LinqDataView Restriction Joins

Erick Thompson — Wed, 24 Oct 2007 21:39:00 GMT

LINQ To DataSet Data Binding – LinqDataView restriction joins In previous episodes In the last post I made on LINQ To DataSet Binding, I talked about how to create a LinqDataView. I’m going to spend some time today talking about some of the interesting...(read more)

LINQ to DataSet – Data Binding

Erick Thompson — Fri, 24 Aug 2007 22:39:00 GMT

With the introduction of LINQ to DataSet there finally exists a full featured query language for the DataSet. Now your ability to query your data is limited only by CLR, which is no small thing! For an introduction on LINQ to DataSet, please see this...(read more)

Problems with the LINQ to Entities 101 samples in the March CTP

Erick Thompson — Wed, 07 Mar 2007 02:13:00 GMT

If you have downloaded the March CTP (and you have, haven't you?) you might have noticed that the LINQ to Entities samples were not functioning correctly right out of the gate. Unfortunately in the fast moving world of CTP development, sometimes the samples and the code get out of sync, and this was one of those times. However, it is not too difficult to get the samples back up and running. Simply follow these steps, and you should be golden.

1. Change MergeOption.NoCaching to MergeOption.NoTracking in the LinqtoEntitiesSamples.cs file

2. Remove ClientAutoGenerated="true" and StoreGenerated="true" from the EntityNorthwind.csdl file (found in the LinqToEntities folder)

3. Either delete the bin folder, or delete all files in the output folder, as there are some files in it that causes problems.

4. If you get a "database already exists" exception, please add "User Instance=true" in the connection string in the LinqToEntitiesSamples.cs file.

Once you've performed these steps, you should be up and running!

We will be updating the samples with these changes, and an announcement will be made at that time as to where to get the download, but in the meantime, this should work.

Please contact me if you are still having problems.

Thanks,

Erick Thompson

ADO.NET Program Manager