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One important thing to note is that in order to use WindowsIdentity.Impersonate(), we need a primary token, so if we go with LOGON32_LOGON_NETWORK, we'll need to use DuplicateHandle in order to get at the primary token. Since I like to avoid extra work like that, it looks like LOGON32_LOGON_BATCH or LOGON32_LOGON_INTERACTIVE would both be more appropriate choices. Selecting between them will depend on the rights that the account we're trying to logon has.
Once your call to LogonUser has gotten you a user token for the user you'd like to impersonate, you can then call WindowsIdentity.Impersonate() and have your thread take over the identity of the Windows user you just logged on.
// Call LogonUser to get a token for the user
IntPtr userHandle = IntPtr.Zero();
bool loggedOn = LogonUser(
throw new Win32Exception(Marshal.GetLastWin32Error());
// Begin impersonating the user
WindowsImpersonationContext impersonationContext = WindowsIdentity.Impersonate(userHandle.Token);
// Clean up
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