gistfile1.cs

//Get LatLngBounds from passed coordinates in form of
//"bounds": {
//  "southWest": {
//    "lat": 51.633983,
//    "lng": 7.402899
//  },
//  "northEast": {
//    "lat": 50.633983,
//    "lng": 6.402899
//  }
//}
DbGeography bounds = this.GetBounds(values);

//"Convert" DbGeography to SqlGeometry to be able to get the envelope (polygon)
var geom = SqlGeometry.STGeomFromWKB(new SqlBytes(bounds.AsBinary()), 32637);

//Create the envelope (polygon) from LatLngBounds
var envelop = geom.STEnvelope();

poi.Shape = DbGeography.FromGml(envelop.AsGml().Value);

return;

//EF error message:
//{"The incoming tabular data stream (TDS) remote procedure call (RPC) protocol stream is incorrect. 
//  Parameter 3 (\"@2\"): The supplied value is not a valid instance of data type geography. 
//  Check the source data for invalid values. 
//  An example of an invalid value is data of numeric type with scale greater than precision."}