title: How to convert latitude/longitude in degrees to BBOX where SRS=EPSG:27700
body: <p>Anyone know how to convert latitude, longitude in degrees to define a <code>BBOX</code> where <code>SRS=EPSG:27700</code>?  </p>
  
  <p>I am trying to call a WMS service with a URL like following (not a real link):
  <a href="http://mysecretmappingserver.com/wms?user=myuser&amp;pwd=mypassword&amp;VERSION=1.1.1&amp;REQUEST=GetMap&amp;LAYERS=ap25cm&amp;STYLES=&amp;SRS=EPSG:27700&amp;BBOX=229096,231675,229296,231875&amp;width=400&amp;height=400" rel="nofollow">http://mysecretmappingserver.com/wms?user=myuser&amp;pwd=mypassword&amp;VERSION=1.1.1&amp;REQUEST=GetMap&amp;LAYERS=ap25cm&amp;STYLES=&amp;SRS=EPSG:27700&amp;BBOX=229096,231675,229296,231875&amp;width=400&amp;height=400</a></p>
  
  <p><strike>Any language would be fine; C# preferable.</strike></p>
  
  <p>Spacedman has been trying to help me, but I can't seem to get Proj4Net to work for me - all me, I'm sure - but if someone knows either Proj4Net or the math involved, that might be better...</p>