Make sure the version of Windows and OS type of the machine that you are using for the application while implementing the impersonation and LogonUser functions in your application.
I faced this error before :-
"Could not load file or assembly 'System.Transactions......' or one of its dependencies. Either a required impersonation level was not provided or the provided impersonation level is invalid."
My application is installed in a pc with 32-bit OS, Windows Vista, etc. And I used LOGON32_LOGON_NETWORK value as logon type for LogonUser function. Finally I get the error above.
The problem is I used LOGON32_LOGON_NETWORK value as logon type for LogonUser function It is because for Windows Vista, the logon type for LogonUser function is not LOGON32_LOGON_NETWORK. LOGON32_LOGON_NETWORK is for using at machine Windows XP.
Therefore, for Windows Vista, the value for logon type should not be LOGON32_LOGON_NETWORK, and should change it to LOGON32_LOGON_NEW_CREDENTIALS. And it can be used also at machine Windows XP.
Click on LogonUser function here to read more details about it.
