/// <summary>
/// An extentension method on an actual object to get its member name.
/// </summary>
/// <typeparam name="T">Type of the actual object whose member name will be obtained.</typeparam>
/// <typeparam name="TResult">Type of the member of the object whose member name will be obtained.</typeparam>
/// <param name="obj">Object whose member name will be obtained.</param>
/// <param name="expression">Lambda expression of member access.</param>
/// <returns></returns>
public static string MemberName<T, TResult>(this T obj, Expression<Func<T, TResult>> expression)
{
	var node = expression.Body as MemberExpression;
	return node.Member.Name;
}

_commonSettings.MemberName<Models.Settings.Common, double>(o => o.ExceedThreshold)

var propertyInfo = Type.GetProperty("PropertyName");