SearchRequest.Radius Property (Bing, Version 2.0)
The distance in any direction for which results will be provided for a request that specifies latitude and longitude.
Public Property Radius as Double
public double Radius { get; set; }
Remarks
Valid input values for Radius range from 0 to 250 miles. The default input value is 5 miles. The output value for Radius is insignificant; it is always set to the default input value of 5.