Silverlight 2 Beta2 includes a bunch of work in the data
Beta2 adds a number of new features to the DataGrid control.
Auto-sizing support for columns and rows
Column sorting (with both single column and multi-column sort support)
Column re-ordering support by end-users (allowing them to
drag/drop columns to re-arrange the order)
Frozen column support (allowing you to prevent a particular
column from being customized)
Performance and bug fixes
Beta2 adds more core data-binding features and better
validation support. These include:
Per-binding Validation and BindingValidationError event handler support on controls (allowing you to handle input validation with TwoWay bindings)
Support for binding expressions on attached properties
Richer binding value conversion support (including value conversion
Silverlight enables applications to store data locally on a
client (via a feature we call "Isolated Storage"). Applications
can prompt users to grant them size permissions for this storage (for example:
a user might grant an email program 50MB of local storage).
Beta2 increases the default local storage space provided to
Silverlight applications to 1MB in size. Beta2 also now provides better
end-user support for managing per-site storage permissions, as well as the
ability to easily revoke/delete an application's local storage.
Management UI to control this can now be brought up by an end-user by
right-clicking on a Silverlight application and choosing the "Silverlight
Configuration" menu option.
Understanding Compatibility with Silverlight 1.0 and
Silverlight 2 Beta 1
Silverlight 2 Beta2 is compatible with applications that
target Silverlight 1.0.
Silverlight 2 Beta2 will not run applications that target
Silverlight 2 Beta1, since we've made a number of API changes between the two
betas for the new features being added in Silverlight 2. Browsers that
have Silverlight 2 Beta1 installed which visit a site that hosts a Silverlight
Beta2 application will be prompted to upgrade to the newer beta of Silverlight.
Once they do this they won't be able to run Beta1 applications without
uninstalling Beta2. This means that if you have published a running
sample on the web built with Beta1 you will probably want to update it to Beta2
We have published a document that details the changes
between Beta1 and Beta2 here that can help with this. I also recommend
reading Shawn Wildermuth's What Changed in Silverlight 2 Beta2 and Upgrading your Silverlight 2 Projects to Beta2 posts for
more details on some of the changes between Beta1 and Beta2.