How to get the attribute of a Enum value without specific the Enum type

How to get the attribute of a Enum value by using refection? For example, we have a Enum:

Enum MyEnum
{
    [Description("A")]
    a,
    [Description("B")]
    b
}

And in my class I have a property of type MyEnum:

class MyClass
{
 MyEnum Prop {set;get;}
}

During the run time, how can I get the description from the actual value of Prop by not hard coding "MyEnum" in m y function?

string GetDescription(PropertyInfo propInfo)
{
   var type = propertyInfo.PropertyType;
   var value = propertyInfo.GetValue(this);

   ????????
}