The new DotNetBar Circular Progres control includes 5 visual styles with endless and minimum/maximum progress indicator types. The endless progress bar runs on background thread so it does not block your user interface. Here is screen-shot of endless progress indicators:
Circular progress indicator will nicely scale to any size you specify as shown in following image:
Control can also be used in minimum/maximum mode to indicate progress towards predefined value. Here is screen-shot of control in that mode:
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