Fields Properties Constructors Methods (edit)

According to the StyleCop Rules Documentation the ordering is as follows.

Within a class, struct or interface: (SA1201 and SA1203)

• Constant Fields
• Fields
• Constructors
• Finalizers (Destructors)
• Delegates
• Events
• Enums
• Interfaces (interface implementations)
• Properties
• Indexers
• Methods
• Structs
• Classes

Within each of these groups order by access: (SA1202)

• public
• internal
• protected internal
• protected
• private

Within each of the access groups, order by static, then non-static: (SA1204)

• static
• non-static

Within each of the static/non-static groups of fields, order by readonly, then non-readonly : (SA1214 and SA1215)

• readonly
• non-readonly

An unrolled list is 130 lines long, so I won't unroll it here. The methods part unrolled is:

• public static methods
• public methods
• internal static methods
• internal methods
• protected internal static methods
• protected internal methods
• protected static methods
• protected methods
• private static methods
• private methods

The documentation notes that if the prescribed order isn't suitable - say, multiple interfaces are being implemented, and the interface methods and properties should be grouped together - then use a partial class to group the related methods and properties together.