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However, this does not roll back the changes in memory or tracked by the Data Context; those changes will need to be rolled back manually.You can start with a new instance of the Data Context if the changes in memory are to be discarded.If we change the int to a bigint in the table design then our query would not longer run because Linq couldn’t convert a long to an int.If we did something like change a nvarchar(50) to a nvarchar(MAX) then this wouldn’t cause a problem as Linq treats them both as a string.

Test Planners Schedules Data Context' does not contain a definition for 'Attach' and no extension method 'Attach' accepting a first argument of type 'Mvc4Test Planning Schedules. Test Planners Schedules Data Context' could be found (are you missing a using directive or an assembly reference?

Regenerating our Data Context So, if you are changing the underlying table, updating the Data Context in your system is also required.

In Visual Studio 2008 there are only two ways to update a Data Context.

If we inserted a new person then this also wouldn’t stop our application from working, unless the new column was set to be NOT NULL, however we wouldn’t be able to fill in that information.

Changing column data types Changing the types in our database could cause our application to stop functioning.

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