Dim myMethodBuilder As MethodBuilder = Nothing
Dim myCurrentDomain As AppDomain = AppDomain.CurrentDomain
' Create assembly in current CurrentDomain.
Dim myAssemblyName As New AssemblyName()
myAssemblyName.Name = "TempAssembly"
' Create a dynamic assembly.
myAssemblyBuilder = myCurrentDomain.DefineDynamicAssembly _
                                      (myAssemblyName, AssemblyBuilderAccess.Run)
' Create a dynamic module in the assembly.
myModuleBuilder = myAssemblyBuilder.DefineDynamicModule("TempModule", True)
Dim myFieldInfo2 As FieldInfo = myModuleBuilder.DefineUninitializedData _
                                      ("myField", 2, FieldAttributes.Public)
' Create a type in the module.
Dim myTypeBuilder As TypeBuilder = myModuleBuilder.DefineType _
                                            ("TempClass", TypeAttributes.Public)
Dim myGreetingField As FieldBuilder = myTypeBuilder.DefineField _
                                 ("Greeting", GetType(String), FieldAttributes.Public)
Dim myConstructorArgs As Type() = {GetType(String)}
' Define a constructor of the dynamic class.
Dim myConstructor As ConstructorBuilder = myTypeBuilder.DefineConstructor _
                  (MethodAttributes.Public, CallingConventions.Standard, myConstructorArgs)
' Set the method implementation flags for the constructor.
myConstructor.SetImplementationFlags(MethodImplAttributes.PreserveSig Or _
                                     MethodImplAttributes.Runtime)
' Get the method implementation flags for the constructor.
Dim myMethodAttributes As MethodImplAttributes = myConstructor.GetMethodImplementationFlags()
Dim myAttributeType As Type = GetType(MethodImplAttributes)
Dim myAttribValue As Integer = CInt(myMethodAttributes)
If Not myAttributeType.IsEnum Then
   Console.WriteLine("This is not an Enum")
End If
' Display the field info names of the retrieved method implementation flags.
Dim myFieldInfo As FieldInfo() = myAttributeType.GetFields(BindingFlags.Public Or _
                                                           BindingFlags.Static)
Console.WriteLine("The Field info names of the MethodImplAttributes for the constructor are:")
Dim i As Integer
For i = 0 To myFieldInfo.Length - 1
   Dim myFieldValue As Integer = CType(myFieldInfo(i).GetValue(Nothing), Int32)
   If(myFieldValue And myAttribValue) = myFieldValue Then
      Console.WriteLine("   " + myFieldInfo(i).Name)
   End If
Next i