The new version works very well.
Why don't you use Enum instead of MethodID_ICoreWebView2.txt
Example
Code:
Public Enum MethodName
    MN_get_Settings = 1
    MN_get_Source = 2
    MN_Navigate = 3
    MN_NavigateToString = 4
    MN_add_NavigationStarting = 5
    .....
End Enum