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Property (As Double )

aWebMapViewer.Longitude = newDoubleValue
or
DoubleValue = aWebMapViewer.Longitude

New in 2011r2

Supported for all project types and targets.

Sets or Gets the longitude of the center of the map being displayed. Because you would normally want to set both the latitude and longitude, you must also call the Update method to send the changes to the browser.

Example

Set the map to a specific latitude and longitude:

MapViewer1.Latitude = 38.8977
MapViewer1.Longitude = -77.0366
MapViewer1.Update