Thanks for writing and for your question.
we internally perform some data processing when a source is assigned and therefore we need the GetEnumerator
method. However, your scenario sounds like a good candidate for using our VirtualizingDataCollection
class which allows for binding the listbox to large amounts of data sets without having to load all the data at start.
Can you please take a look at this help article which gives some hints on using this collection and let us know whether it will do the job for you?:
All the best,
the Telerik team
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