The ornamental design for an electronicwhiteboard, as shown and described.
1. Electronic whiteboard
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Top
1.6 : Bottom
1.7 : Back perspective view
1.8 : Cross-sectional view
1.9 : Partial enlarged cross-sectional view
1.10 : Reference view 1
1.11 : Reference view 2
The fine lines on the drawings indicate the curved surface and display part; the broken lines depict portions of the electronic whiteboard that form no part of the claimed design; reproduction 1.1 is a front perspective view of the electronic whiteboard; reproduction 1.2 is a front view thereof; reproduction 1.3 is a back view thereof; reproduction 1.4 a left view thereof where the right view is a mirror image; reproduction 1.5 is a top view thereof; reproduction 1.6 is a bottom view thereof; reproduction 1.7 is a back perspective view thereof; reproduction 1.8 is a cross-sectional view taken along line A-A′ in reproduction 1.2; reproduction 1.9 is a partial enlarged cross-sectional view of the lower part of reproduction 1.8; reproduction 1.10 is a reference view showing the use state of the claimed design where a pen is placed in the groove at the bottom of the front part; reproduction 1.11 is a reference view showing the state where the cover on the lower left side of the front has been slided so that the USB ports, etc., are visible; reproductions 1.10 and 1.11 are for reference purposes only and form no part of the claimed design; this design is for an electronic whiteboard which has a groove at the bottom of the front part and where the pen can be placed.