title: Esri maps coordinate convert
body: <p>I'm trying to implement <code>Esri maps</code> into a WPF project and I can't get my head around the coordinates they use. The old system used <code>lat/long</code> so I need to get the same values from Esri.</p>
  
  <p>When I get the MapPoint object for the current position of the map, its X value is <code>300464.16687909653</code> and its Y value is <code>524877.02696703083</code>. I need to take these values and convert them to lat and lon, then convert them the other way whenever necessary. I'm struggling finding anything that can help with this conversion, I presumed there would be some easy C# conversion methods lying around but I can't seem to find them.</p>
  
  <p>Can anyone help?</p>
  
  <p>(Just to be clear, I'm using the .NET sdk)</p>