Get string name of property using reflection

If you already have a PropertyInfo, then @dtb's answer is the right one. If, however, you're wanting to find out which property's code you're currently in, you'll have to traverse the current call stack to find out which method you're currently executing and derive the property name from there.

var stackTrace = new StackTrace();
var frames = stackTrace.GetFrames();
var thisFrame = frames[0];
var method = thisFrame.GetMethod();
var methodName = method.Name; // Should be get_* or set_*
var propertyName = method.Name.Substring(4);

Edit:

After your clarification, I'm wondering if what you're wanting to do is get the name of a property from a property expression. If so, you might want to write a method like this:

public static string GetPropertyName<T>(Expression<Func<T>> propertyExpression)
{
    return (propertyExpression.Body as MemberExpression).Member.Name;
}

To use it, you'd write something like this:

var propertyName = GetPropertyName(
    () => myObject.AProperty); // returns "AProperty"

With C# 6.0 (Visual Studio 2015), you can now use the nameof operator, like this:

var obj = new MyObject();
string propertyName = nameof(obj.Property);
string methodName = nameof(obj.Method);
string directPropertyName = nameof(MyObject.Property);
string directMethodName = nameof(MyObject.Method);

PropertyInfo.Name

In case anyone needs it...here is the VB .NET version of the answer:

Public Shared Function GetPropertyName(Of t)(ByVal PropertyExp As Expression(Of Func(Of t))) As String
   Return TryCast(PropertyExp.Body, MemberExpression).Member.Name
End Function

Usage:

Dim name As String = GetPropertyName(Function() (New myObject).AProperty)