Safely get the property value from a source object. If the source object is null, then get the default value.

ObjectExtensions.cs

public static class ObjectExtensions
{
    public static TReturn safe<T, TReturn>(this T testedObject, Func<T, TReturn> member, TReturn defaultValue = default(TReturn))
        where T : class
    {
        return testedObject != null ? member(testedObject) : defaultValue;
    }
}

// Usage example:
// var host = Request.safe(x => x.UrlReferrer).safe(x => x.Host);
// the code above is a shotrcut of:
// var host = Request != null ? (Request.UrlReferrer != null ? Request.UrlReferrer.Host : null) : null;

Usage example:
var host = Request.safe(x => x.UrlReferrer).safe(x => x.Host);

the code above is a shotrcut of:
var host = Request != null ? (Request.UrlReferrer != null ? Request.UrlReferrer.Host : null) : null;