private static extern CredUIReturnCodes CredUIConfirmCredentials( string targetName, [MarshalAs(UnmanagedType.Bool)] bool confirm);

private static extern CredUIReturnCodes CredUIParseUserName(

CredUIReturnCodes is a handy enum to use to interpret the integer return value.

    CredUIReturnCodes returnCode = NativeMethods.CredUIParseUserName(userName, userBuilder, int.MaxValue, domainBuilder, int.MaxValue);

    case CredUIReturnCodes.NO_ERROR: // The username is valid.

    case CredUIReturnCodes.ERROR_INVALID_ACCOUNT_NAME: // The username is not valid.

    //case CredUIReturnCodes.ERROR_INSUFFICIENT_BUFFER: // One of the buffers is too small.

    case CredUIReturnCodes.ERROR_INVALID_PARAMETER: // ulUserMaxChars or ulDomainMaxChars is zero OR userName, user, or domain is NULL.

  private static extern CredUIReturnCodes CredUIPromptForCredentialsW(ref CREDUI_INFO creditUR,

                            flags AS CREDUI_FLAGS) As CredUIReturnCodes

CREDUI_FLAGS, CREDUI_INFO, CredUIReturnCodes

  public static CredUIReturnCodes PromptForCredentials(

  CredUIReturnCodes result = CredUIPromptForCredentialsW(

  CredUIReturnCodes result = PromptForCredentials(ref info, host, 0, ref username,

  private static extern CredUIReturnCodes CredUIPromptForCredentialsW(ref CREDUI_INFO creditUR,

                            flags AS CREDUI_FLAGS) As CredUIReturnCodes

CREDUI_FLAGS, CREDUI_INFO, CredUIReturnCodes

  public static CredUIReturnCodes PromptForCredentials(

  CredUIReturnCodes result = CredUIPromptForCredentialsW(

  CredUIReturnCodes result = PromptForCredentials(ref info, host, 0, ref username,

    ''' <returns>A <see cref="CredUIReturnCodes" /> value.</returns>

                                ByVal dwFlags As CredUIWinFlags) As CredUIReturnCodes

    Public Enum CredUIReturnCodes As Integer

  public enum CredUIReturnCodes

    Public Enum CredUIReturnCodes