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Non-default app domains will continue to inherit their Target Framework Name from the default app domain (which will not default to null in 4.6) unless it is explicitly overridden.

This change affects apps that are recompiled to target the . A similar issue occurs with List View and Data Grid. If columns are removed before the asynchronous work happens, an Argument Out Of Range Exception can occur.

NET Framework 4.6 and that implement special handling for the Argument Out Of Range Exception that is thrown when an Icon object has PNG frames. NET Framework 4.6, the conversion is successful, an Argument Out Of Range Exception is no longer thrown, and therefore the exception handler is no longer invoked. NET Framework 4.5, event handlers for Data Grid events involving the removal of a row can cause a Null Reference Exception to be thrown if they access the Data Grid's Selected Item or Selected Items properties. This change applies to an Items Control that does its own virtualization in the direction orthogonal to the main scrolling direction (the chief example is Data Grid with Enable Column Virtualization="True").

In the topics that describe runtime changes, we have classified individual items by their expected impact, as follows: Major This is a significant change that affects a large number of apps or that requires substantial modification of code.

Minor This is a change that affects a small number of apps or that requires minor modification of code. NET Framework 4.5.1/4.5.2, an alternate serializer like the Data Contract Serializer or Binary Formatter serializer should be used instead of the Net Data Contract Serializer.

This change allows the connection open attempt to be retried immediately for Azure SQL databases, thereby improving the performance of cloud- enabled apps.