pinvoke.net: Edit: netapi32.NetWkstaUserGetInfo

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Summary: Returns information about the currently logged-on user. This function must be called in the context of the logged-on user.

!!!!C# Signature:
 [DllImport("netapi32.dll", SetLastError=true)]
 static extern int NetWkstaUserGetInfo(
	[MarshalAs(UnmanagedType.LPWStr)]string reserved, 
        int level, out IntPtr lpBuffer);
!!!!VB Signature:
 Declare Function NetWkstaUserGetInfo Lib "netapi32.dll" (ByVal reserved As String, ByVal level As Integer, ByRef lpBuffer As IntPtr) As Integer
!!!!User-Defined Types:
 [StructLayout(LayoutKind.Sequential)]
 public struct WKSTA_USER_INFO_1
 {
	[MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
	public string wkui1_username;
 
	[MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
	public string wkui1_logon_domain;
 
	[MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
	public string wkui1_oth_domains;

[MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPWStr)]
	public string wkui1_logon_server;
 }

!!!!Alternative Managed API:
Do you know one?  Please contribute it!

!!!!Notes:
None.

!!!!Tips & Tricks:
Please add some!

!!!!Sample Code:
	Private Sub GetLoggedInUserInfo()
        	Dim lpBuffer As IntPtr
	        Dim result As Integer = NetWkstaUserGetInfo(Nothing, 1, lpBuffer)
        	If result = 0 Then
	            Dim wksInfo As WKSTA_USER_INFO_1 = Marshal.PtrToStructure(lpBuffer, GetType(WKSTA_USER_INFO_1))
		    ''' Do something
	            NetApiBufferFree(lpBuffer)
        	End If
	End Sub

!!!!C# Sample
 /// <summary>
 /// Retrieves the default domain for the currently logged in user.
 /// </summary>
 /// <returns>The name of the domain currently logged into.</returns>
 public static string GetDefaultDomain()
 {
	IntPtr buffer = new IntPtr();
	string domain = "";
	int result;
	WKSTA_USER_INFO_1 wksInfo;

result = NetWkstaUserGetInfo(null, 1, out buffer);
	if (result == 0)
	{
                wksInfo = (WKSTA_USER_INFO_1)Marshal.PtrToStructure(
                    buffer, typeof(WKSTA_USER_INFO_1));

domain = wksInfo.wkui1101_logon_domain;
                System.Windows.Forms.MessageBox.Show(domain);
                NetApiBufferFree(buffer);
	}
            
	return domain;
 }

Please add some more!

Documentation: NetWkstaUserGetInfo@msdn on MSDN