/// <returns>If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError.</returns>

    /// Returns NULL upon failure. Call the GetLastError function for more information on the error. The following table describe common errors:</returns>

If no error occurs, sendto returns the total number of bytes sent, which can be less than the number indicated by len. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.

WSAGetLastError.

If no error occurs, sendto returns the total number of bytes sent, which can be less than the number indicated by len. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.

WSAGetLastError.

static extern Int32 WSAGetLastError();

Declare Function WSAGetLastError Lib "ws2_32.dll" () As Int32

If the function cannot find an account name for the SID, the LookupAccountSid function fails and GetLastError returns ERROR_NONE_MAPPED. This can occur if a network time-out prevents the function from finding the name. It also occurs for SIDs that have no corresponding account name, such as a logon SID that identifies a logon session.

        aWinErrorCode = (uint)GetLastError();

public static void SetFileOrFolderOwner(String objectName) //Note this is very basic and is silent on fail as I havent checked GetlastError and thrown an exception etc

One of the many error codes returned by GetLastError, which should not be used within the .NET framework. Instead you must use Marshal.GetLastWin32Error().

It is documented that you should NOT use the pinvoke GetLastError() due to the fact that the runtime

/// <para>If the function fails, the return value is NULL. To get extended error information, call GetLastError.</para>

''' <para>If the function fails, the return value is NULL. To get extended error information, call GetLastError.</para>

When you call this function, the WndProc function must respond to the WM_NCCREATE message by returning TRUE. If it does not, the creation process will fail. A null handle will be returned from CreateWindowEx and GetLastError will return 0. See MSDN on WM_NCCREATE (http://msdn.microsoft.com/en-us/library/ms632635.aspx) and also WM_CREATE (http://msdn.microsoft.com/en-us/library/ms632619.aspx). You can have your WndProc call DefWindowProc, which will take care of this issue.

/// <returns>If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError.</returns>

''' <returns>If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError.</returns>

///     <para>To get extended error information, call GetLastError.</para>

If the clipboard is not owned, the return value is NULL. To get extended error information, call GetLastError.

Windows NT/2000/XP: To get extended error information, call GetLastError.

Windows NT/2000/XP: To get extended error information, call GetLastError.

static extern uint GetLastError(TODO);

Declare Function GetLastError Lib "kernel32.dll" (TODO) As TODO

    int nLatError = GetLastError(); // in kernel32.dll

/// to the specified window, the return value is NULL. To get extended error information, call GetLastError.

/// If the function fails, the return value is zero. To get extended error information, call GetLastError.

///     call GetLastError.

///     or control handle is invalid, the return value is zero. To get extended error information, call GetLastError.<br />

///     <br />To get extended error information, call GetLastError.

    ''' <para>If the function fails, the return value is zero. To get extended error information, call GetLastError.</para></returns>

MSDN says: If the function fails, the return value is zero. To get extended error information, call GetLastError.

///     information, call GetLastError.

/// <para>Windows Vista: RemoveProp is subject to the restrictions of User Interface Privilege Isolation (UIPI). A process can only call this function on a window belonging to a process of lesser or equal integrity level. When UIPI blocks property changes, GetLastError will return 5.</para>

/// <para>Windows Vista: SetProp is subject to the restrictions of User Interface Privilege Isolation (UIPI). A process can only call this function on a window belonging to a process of lesser or equal integrity level. When UIPI blocks property changes, GetLastError will return 5.</para>

/// <returns>If the data handle and string are added to the property list, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError.</returns>

/// If the function fails, the return value is zero. To get extended error information, call GetLastError.

///     To get extended error information, call GetLastError.

    // will fail and GetLastError() will indicate ERROR_PASSWORD_RESTRICTION

    ' will fail and GetLastError() will indicate ERROR_PASSWORD_RESTRICTION

     /// This value returns <B>FALSE</B>. If you call <see cref="GetLastError"/> to get extended error information, <B>GetLastError</B> returns <B>ERROR_NOT_SUPPORTED</B>.

     /// This value returns <B>FALSE</B>. If you call <see cref="GetLastError"/> to get extended error information, <B>GetLastError</B> returns <B>ERROR_NOT_SUPPORTED</B>.

     /// This value returns <B>FALSE</B>. If you call <see cref="GetLastError"/> to get extended error information, <B>GetLastError</B> returns <B>ERROR_NOT_SUPPORTED</B>.

     /// This value returns <B>FALSE</B>. If you call <see cref="GetLastError"/> to get extended error information, <B>GetLastError</B> returns <B>ERROR_NOT_SUPPORTED</B>.

     /// This value returns <B>FALSE</B>. If you call <see cref="GetLastError"/> to get extended error information, <B>GetLastError</B> returns <B>ERROR_NOT_SUPPORTED</B>.

     /// This value returns <B>FALSE</B>. If you call <see cref="GetLastError"/> to get extended error information, <B>GetLastError</B> returns <B>ERROR_NOT_SUPPORTED</B>.

As always, only do SetLastError=true if you actually intend to call GetLastError.

As always, only do SetLastError=true if you actually intend to call GetLastError.

As always, only do SetLastError=true if you actually intend to call GetLastError (This includes throwing a Win32Exception if the call fails)

    // If you did not succeed, GetLastError may give more information

                Console.WriteLine("Call to EnumDeviceDrivers failed!  To get extended error information, call GetLastError.");

                Console.WriteLine("Call to EnumDeviceDrivers failed!  To get extended error information, call GetLastError.");

                Console.WriteLine("Call to EnumDeviceDrivers failed!  To get extended error information, call GetLastError.");

                Console.WriteLine("Call to EnumDeviceDrivers failed!  To get extended error information, call GetLastError.");

SP_COPY_NOOVERWRITE Copy only if the specified files don't currently exist in the INF directory. If the INF does currently exist, this API will fail and GetLastError returns ERROR_FILE_EXISTS. In this case, the existing INF file's filename will be placed into the appropriate field in the destination INF file's information output buffers.

in Size of the DestinationInfFileName buffer, in characters, or zero if the buffer is not specified. If DestinationInfFileName is specified and this buffer size is less than the size required to return the destination INF filename (including full path), this function will fail. In this case GetLastError will return ERROR_INSUFFICIENT_BUFFER.

The SetupCopyOEMInf function failed. For extended error information, call GetLastError.

        ErrorCode = GetLastError();

A call to SetupDiEnumDeviceInterfaces retrieves a pointer to a structure that identifies a specific device interface in the previously retrieved DeviceInfoSet array. The call specifies a device interface by passing an array index. To retrieve information about all of the device interfaces, an application can loop through the array, incrementing the array index until the function returns zero, indicating that there are no more interfaces. The GetLastError API function then returns No more data is available.

If the function could not find a line, the return value is zero. To get extended error information, call GetLastError.

If this function finds the next line, the return value is a nonzero value. Otherwise, the return value is zero. To get extended error information, call GetLastError.

The function returns a nonzero value if it finds a matching line. Otherwise, the return value is zero. To get extended error information, call GetLastError.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

If this function is called with a ReturnBuffer of NULL and a ReturnBufferSize of zero, the function puts the buffer size needed to hold the specified data into the variable pointed to by RequiredSize. If the function succeeds in this, the return value is a nonzero value. Otherwise, the return value is zero and extended error information can be obtained by calling GetLastError. You can call the function once to get the required buffer size, allocate the necessary memory, and then call the function a second time to retrieve the data. Using this technique, you can avoid errors due to an insufficient buffer size.

The function returns a handle to the opened INF file if it is successful. Otherwise, the return value is INVALID_HANDLE_VALUE. Extended error information can be retrieved by a call to GetLastError.

If the load fails because the INF file type does not match InfClass, the function returns INVALID_HANDLE_VALUE and a call to GetLastError returns ERROR_CLASS_MISMATCH.

I'd go so far as to recommend always mandating SetLastError -- explicitly setting SetLastError=false, to call out the (comparatively rare) Win32 functions that don't expose a failure path through GetLastError.

    ''' <returns>Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.</returns>

    ''' <returns>Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.</returns>

//public static extern int GetLastError();

You will need the above ProcessInfo class and may also want to use GetLastError and WaitForSingleObject.

Returns true if function succeeds; otherwise, false. To retrieve extended error information, call GetLastError

static extern Int32 GetLastError();

Declare Function GetLastError Lib "coredll.dll" () As Int32

It is recommended that you do not call the Win32 GetLastError method directly. Because of the way P/Invoke works, the error message may get reset between Win32 calls in your code. Instead, call the Marshal.GetLastWin32Error method, which can be combined with the ever useful Marshal.ThrowExceptionForHR method. See below for an example.

Int32 lastError = GetLastError();

lastError = GetLastError()

3 - SYSMEM_FAILED: Change failed. Use GetLastError to get more details.

     int error = Marshal.GetLastWin32Error();    // Equivalent to Win32 GetLastError()

WAIT_FAILED indicates failure. To get extended error information, call GetLastError.

public static extern int CeGetLastError();

function info on msdn at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceactsy/html/cerefCeGetLastErrorRAPI.asp

Returns 0 for failure. Use CeGetLastError() and CeRapiGetError() to see errors on failure.

Return Values : Returns TRUE if successful, or FALSE otherwise. To get a specific error message, call GetLastError.

    [DllImport("wininet.dll", EntryPoint = "GetLastError")]

    public static extern long GetLastError();

    * Returns a valid handle to the FTP, Gopher, or HTTP session if the connection is successful, or NULL otherwise. To get extended error information, call GetLastError. An application can also use InternetGetLastResponseInfo to determine why access to the service was denied.

/// <returns>Returns TRUE if the file exists, or FALSE otherwise. Call GetLastError for extended error information.</returns>

''' <returns>Returns TRUE if the file exists, or FALSE otherwise. Call GetLastError for extended error information.</returns>