ExpressMemData is an ultra-fast in-memory TDataSet
descendant you can use to bind data from any datasource
(including text, binary, ini and many other file types)
in conjunction with all existing VCL data-aware
controls.

With MemData, you can create all standard field types
and yes, BLOB fields are supported. You can populate
MemData in two ways: As a TDataSet, by assigning values
to its fields - which is easier and will be fully
compatible when you decide to switch your MemData to a
database back-end; Or by accessing the internal buffers
of MemData as an array.

When you use MemData in your application, no additional
DLLs are required - all the functionality is built
right into your program. MemData is ideal for fast,
single-user applications where you require the ability
to use existing data-aware control and maintain the
functionality you have come to expect such as data
validation.

http://www.devexpress.com/

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