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6

There is a JavaScript from Convert between Latitude/Longitude & OS National Grid References which converts between easting/northings to lon/lat, which could be helpful. It is also available in GitHub


4

I'd recommend using something like the proj4 library, which has wrappers in several languages, including JavaScript - Proj4JS. For C#, there's proj4net It has the advantage you can translate between all sorts of projections, not just OSGB. I'm not a great JS developer, but something like this should do the trick to convert OSGB back to WGS84 EDIT oops.. ...


3

Got this fixed. For those facing similar issue: expand the "References", find the ESRI.ArcGIS.Display reference. Right click it and select properties, and change "Embed Interop Types" to false.


2

It is not possible to use Esri Addins, regardless of whether you are using Python Addins or .NET Addins, to extend a custom application. You can only use Esri Addins to extend ArcGIS for Desktop applications (ArcMap, ArcCatalog, ArcScene, ArcGlobe). The error you are receiving is likely the result of your target name and/or version value not being a legal ...



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