static extern int gethostname(StringBuilder name, int length);

    public static extern uint InetNtop(ADDRESS_FAMILIES Family, ref in_addr pAddr, StringBuilder pStringBuf, int StringBufSize);

    public static extern uint InetNtop(ADDRESS_FAMILIES Family, ref in6_addr pAddr, StringBuilder pStringBuf, int StringBufSize);

        StringBuilder lpszAddressString, ref int lpdwAddressStringLength);

        StringBuilder lpszAddressString, ref int lpdwAddressStringLength);

     int GetWallpaper([MarshalAs(UnmanagedType.LPWStr)]  System.Text.StringBuilder pwszWallpaper,

     int GetPattern([MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pwszPattern, int cchPattern, int dwReserved);

    Function GetWallpaper(<MarshalAs(UnmanagedType.LPWStr)> ByVal pwszWallpaper As StringBuilder, ByVal cchWallpaper As Integer, ByVal dwReserved As Integer) As Integer

    Function GetPattern(<MarshalAs(UnmanagedType.LPWStr)> ByVal pwszPattern As StringBuilder, ByVal cchPattern As Integer, ByVal dwReserved As Integer) As Integer

    void GetCommandString(int idcmd, uint uflags, int reserved, StringBuilder commandstring, int cch);

    int GetIconLocation(IExtractIconuFlags uFlags, [Out, MarshalAs(UnmanagedType.LPWStr, SizeParamIndex = 2)] StringBuilder szIconFile, int cchMax, out int piIndex, out IExtractIconpwFlags pwFlags);

   [MarshalAs(UnmanagedType.LPStr)] StringBuilder szIconFile,

        StringBuilder pszPathBuffer,

        <Out(), MarshalAs(UnmanagedType.LPWStr)> ByVal pszPathBuffer As System.Text.StringBuilder, _

       StringBuilder awcBuffer);

           awcBuffer As StringBuilderByVal _

             StringBuilder pwszUrl,

             StringBuilder pwszText,

              StringBuilder pwszUrl,

              StringBuilder pwszText,

        [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder szName,

        [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder szName,

        [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder szName,

        [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder szName,

        [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder szName,

        StringBuilder szName = new StringBuilder(Convert.ToInt32(cMax));

    ' CAUTION: This method is untested! It returns a value, so probably should be StringBuilder, but this

    <PreserveSig()> Function GetCurFile(<MarshalAs(UnmanagedType.LPWStr)> ByVal ppszFileName As Text.StringBuilder) As HRESULT

    void GetPath([Out(), MarshalAs(UnmanagedType.LPStr)] StringBuilder pszFile, int cchMaxPath

    void GetDescription([Out(), MarshalAs(UnmanagedType.LPStr)] StringBuilder pszName, int cchMaxName);

    void GetWorkingDirectory([Out(), MarshalAs(UnmanagedType.LPStr)] StringBuilder pszDir, int cchMaxPath);

    void GetArguments([Out(), MarshalAs(UnmanagedType.LPStr)] StringBuilder pszArgs, int cchMaxPath);

    void GetIconLocation([Out(), MarshalAs(UnmanagedType.LPStr)] StringBuilder pszIconPath

    Sub GetPath(<Out(), MarshalAs(UnmanagedType.LPStr)> ByVal pszFile As StringBuilder, ByVal cchMaxPath As Integer, ByRef pfd As WIN32_FIND_DATAA, ByVal fFlags As UInteger)

    Sub GetDescription(<Out(), MarshalAs(UnmanagedType.LPStr)> ByVal pszFile As StringBuilder, ByVal cchMaxName As Integer)

    Sub GetWorkingDirectory(<Out(), MarshalAs(UnmanagedType.LPStr)> ByVal pszDir As StringBuilder, ByVal cchMaxPath As Integer)

    Sub GetArguments(<Out(), MarshalAs(UnmanagedType.LPStr)> ByVal pszArgs As StringBuilder, ByVal cchMaxPath As Integer)

    Sub GetIconLocation(<Out(), MarshalAs(UnmanagedType.LPStr)> ByVal pszIconPath As StringBuilder, ByVal cchIconPath As Integer, ByRef piIcon As Integer)

    void GetPath([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszFile, int cchMaxPath, out UnsafeNativeMethods.WIN32_FIND_DATAW pfd, UnsafeNativeMethods.SLGP_FLAGS fFlags);

    void GetDescription([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszName, int cchMaxName);

    void GetWorkingDirectory([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszDir, int cchMaxPath);

    void GetArguments([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszArgs, int cchMaxPath);

    void GetIconLocation([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszIconPath,

            <MarshalAs(UnmanagedType.LPWStr)> ByVal pszFile As Text.StringBuilder, _

            <MarshalAs(UnmanagedType.LPWStr)> ByVal pszName As Text.StringBuilder, _

            <MarshalAs(UnmanagedType.LPWStr)> ByVal pszDir As Text.StringBuilder, _

            <MarshalAs(UnmanagedType.LPWStr)> ByVal pszArgs As Text.StringBuilder, _

            <MarshalAs(UnmanagedType.LPWStr)> ByVal pszIconPath As Text.StringBuilder, _

    StringBuilder vetoName,

        StringBuilder sb = new StringBuilder();

   StringBuilder directory, ref int bufferLength);

   (ByVal hConnect As IntPtr, ByVal directory As StringBuilder, ByRef bufferLength As Integer) _

    Dim s As New System.Text.StringBuilder

static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref System.UInt32 pcchCookieData, int dwFlags, IntPtr lpReserved);

    ByVal pchCookieData As System.Text.StringBuilder, ByRef pcchCookieData As Integer, ByVal flags As Integer, ByVal reserved As Integer) As _

    static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref System.UInt32 pcchCookieData, int dwFlags, IntPtr lpReserved);

        StringBuilder cookieData = new StringBuilder(Convert.ToInt32(datasize));

        // Allocate stringbuilder large enough to hold the cookie    

        cookieData = new StringBuilder(Convert.ToInt32(datasize));

static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref System.UInt32 pcchCookieData, int dwFlags, IntPtr lpReserved);

    ByVal pchCookieData As System.Text.StringBuilder, ByRef pcchCookieData As Integer, ByVal flags As Integer, ByVal reserved As Integer) As _

   out int errorCode, StringBuilder buffer, ref int bufferLength);

    Shared Function PrivacySetZonePreference( ByVal dwZone As Integer, ByVal dwType As Integer, ByVal dwTemplate As Integer, <MarshalAs(UnmanagedType.LPWStr)> ByVal lpszPreference As StringBuilder) As Integer

    Dim sBuffer As StringBuilder

    sBuffer = New StringBuilder(" ", dwBufferLength)

        sBuffer = New StringBuilder(dwBufferLength)

    Shared Function PrivacySetZonePreference( ByVal dwZone As Integer, ByVal dwType As Integer, ByVal dwTemplate As Integer, <MarshalAs(UnmanagedType.LPWStr)> ByVal lpszPreference As StringBuilder) As Integer

    Dim sPreference As StringBuilder

        sPreference = New StringBuilder

Use System.Text.StringBuilder instead of System.String.

            StringBuilder s = new StringBuilder();

    StringBuilder buffer,

    StringBuilder buffer,

static extern int sprintf([In,Out]StringBuilder buffer, String fmt,

static extern int sprintf([In,Out]StringBuilder buffer, String fmt,

static extern int sprintf([In,Out]StringBuilder buffer, String fmt,

  Public Shared Function sprintf(ByVal TargetString As System.Text.StringBuilder,

StringBuilder buffer = new StringBuilder(255);

    StringBuilder lpszErrorString,  // buffer to hold error string

                StringBuilder sb=new StringBuilder(512);

     [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pwszOut,

   StringBuilder sb = new StringBuilder(size);

static extern uint AssocQueryString(AssocF flags, AssocStr str, string pszAssoc, string pszExtra, [Out] StringBuilder pszOut, ref uint pcchOut);

Private Shared Function AssocQueryString(ByVal flags As UInteger, ByVal str As UInteger, ByVal pszAssoc As String, ByVal pszExtra As String, ByVal pszOut As Text.StringBuilder, ByRef pcchOut As UInteger) As UInteger

  var sb = new StringBuilder((int)length); //(length-1) will probably work too as null termination is added

static extern IntPtr PathAddBackslash([MarshalAs(UnmanagedType.LPTStr)]System.Text.StringBuilder lpszPath);

Public Function PathAddBackslash(<MarshalAs(UnmanagedType.LPTStr)>lpszPath As System.Text.StringBuilder) As IntPtr

static extern bool PathAppend([In, Out] StringBuilder pszPath, string pszMore);

Public Function PathAppend(<MarshalAs(UnmanagedType.LPTStr)>pszPath As System.Text.StringBuilder, _

static extern string PathBuildRoot([MarshalAs(UnmanagedType.LPTStr)]szRoot As System.Text.StringBuilder,

Public Function PathBuildRoot(<MarshalAs(UnmanagedType.LPTStr)>szRoot As System.Text.StringBuilder, _

    public static extern bool PathCanonicalize([Out] StringBuilder dst, string src);

static extern string PathCombine([Out] StringBuilder lpszDest, string lpszDir, string lpszFile);

Declare Unicode Function PathCombine Lib "shlwapi.dll" Alias "PathCombineW" (<MarshalAs(UnmanagedType.LPTStr)> PathOut As System.Text.StringBuilder, <MarshalAs(UnmanagedType.LPTStr)> PathIn As String, <MarshalAs(UnmanagedType.LPTStr)> More As String) As IntPtr

    static extern string PathCombine([Out] StringBuilder lpszDest, string lpszDir, string lpszFile);

        StringBuilder sb = new StringBuilder();

    [Out] StringBuilder pszPath

StringBuilder str = new StringBuilder(MAX_PATH);

static extern bool PathCompactPathEx([Out] StringBuilder pszOut, string szPath, int cchMax, int dwFlags);

                      <MarshalAs(UnmanagedType.LPTStr)> pszOut As System.Text.StringBuilder,

        static extern bool PathCompactPathEx([Out] StringBuilder pszOut, string szPath, int cchMax, int dwFlags);

            StringBuilder sb = new StringBuilder(wantedLength + 1);

        Dim sb As New Text.StringBuilder(MAX_WIDTH + 1)

static extern bool PathCompactPathEx([Out] StringBuilder pszOut, string szPath, int cchMax, int dwFlags);

                      <MarshalAs(UnmanagedType.LPTStr)> pszOut As System.Text.StringBuilder,

        static extern bool PathCompactPathEx([Out] StringBuilder pszOut, string szPath, int cchMax, int dwFlags);

            StringBuilder sb = new StringBuilder(wantedLength + 1);

        Dim sb As New Text.StringBuilder(MAX_WIDTH + 1)

static extern int PathCreateFromUrl([In]string url, [Out] StringBuilder path, [In,Out]ref uint pathLength, [In]uint reserved);

     ByVal path As System.Text.StringBuilder, _

      Dim sb As System.Text.StringBuilder

      sb = New System.Text.StringBuilder(INTERNET_MAX_URL_LENGTH)

static extern bool PathFindOnPath([In, Out] StringBuilder pszFile, [In] String [] ppszOtherDirs);

StringBuilder sb = new StringBuilder("somefile.dll", MAX_PATH);

static extern System.Text.StringBuilder PathGetArgs([MarshalAs(UnmanagedType.LPTStr)]string pszPath);

Public Function PathGetArgs(<MarshalAs(UnmanagedType.LPTStr)>pszPath As String) As <MarshalAs(UnmanagedType.LPTStr)> System.Text.StringBuilder

Dim args As New System.Text.StringBuilder(255)

static extern bool PathQuoteSpaces([MarshalAs(UnmanagedType.LPTStr)]System.Text.StringBuilder lpsz);

Public Function PathQuoteSpaces(<MarshalAs(UnmanagedType.LPTStr)>lpsz As System.Text.StringBuilder) As <MarshalAs(UnmanagedType.Bool)> Boolean

     [Out] StringBuilder pszPath,

     ByVal pszPath As StringBuilder, _

    ByVal pszPath As StringBuilder, _

StringBuilder str = new StringBuilder(MAX_PATH);

static extern void PathRemoveArgs([MarshalAs(UnmanagedType.LPTStr)]System.Text.StringBuilder lpszPath);

Public sub PathRemoveArgs(<MarshalAs(UnmanagedType.LPTStr)>lpszPath As System.Text.StringBuilder)

static extern IntPtr PathRemoveBackslash([MarshalAs(UnmanagedType.LPTStr)]System.Text.StringBuilder lpszPath);

Public Function PathRemoveBackslash(<MarshalAs(UnmanagedType.LPTStr)>lpszPath As System.Text.StringBuilder) As IntPtr

static extern void PathRemoveExtension([MarshalAs(UnmanagedType.LPTStr)]System.Text.StringBuilder pszFile);

Public Sub PathRemoveExtension(<MarshalAs(UnmanagedType.LPTStr)>pszFile As System.Text.StringBuilder)

Dim strFile As New system.Text.StringBuilder(255)

static extern bool PathRemoveFileSpec([In,Out] StringBuilder pszPath);

StringBuilder str = new StringBuilder(@"C:\TEST\sample.txt");

static extern bool PathRenameExtension([MarshalAs(UnmanagedType.LPTStr)]System.Text.StringBuilder lpszPath,

Public Function PathRenameExtension(<MarshalAs(UnmanagedType.LPTStr)>lpszPath As System.Text.StringBuilder, _

static extern void PathStripPath([In,Out] StringBuilder pszPath);

Public Sub PathStripPath(<MarshalAs(UnmanagedType.LPTStr)>pszPath As System.Text.StringBuilder)

StringBuilder str = new StringBuilder(@"c:\dir1\file.txt");

Dim strFile As New system.Text.StringBuilder(255)

static extern bool PathUnExpandEnvStrings(string pszPath, [Out] StringBuilder pszBuf, int cchBuf);

           <MarshalAs(UnmanagedType.LPTStr)>lpszPath As System.Text.StringBuilder, _

StringBuilder sb = new StringBuilder(MAX_PATH-1);

Dim sb As New System.Text.StringBuilder(1024)

static extern void PathUnQuoteSpaces([MarshalAs(UnmanagedType.LPTStr)]System.Text.StringBuilder lpsz);

Public Sub PathUnQuoteSpaces(<MarshalAs(UnmanagedType.LPTStr)>lpsz As System.Text.StringBuilder)

    public static extern int SHLoadIndirectString(string pszSource, StringBuilder pszOutBuf, int cchOutBuf, IntPtr ppvReserved);

StringBuilder outBuff = new StringBuilder();

StringBuilder outBuff = new StringBuilder(1024);

        , [MarshalAs ( UnmanagedType.LPTStr )] StringBuilder buffer

public static extern long StrFormatByteSize( long fileSize, System.Text.StringBuilder buffer, int bufferSize );

         ByVal buffer As Text.StringBuilder, _

     StringBuilder sb = new StringBuilder( 11 );

     Dim sb As New Text.StringBuilder( 20 )

     public static extern long StrFormatByteSize( long fileSize, System.Text.StringBuilder buffer, int bufferSize );

$sb = New-Object Text.StringBuilder 100

static extern int StrFromTimeInterval([MarshalAs(UnmanagedType.LPWStr)] StringBuilder buffer, uint bufferSize, uint milliSeconds, int digits);

    StringBuilder sb = new StringBuilder();

    [Out]    StringBuilder url,

     ByVal url As System.Text.StringBuilder, _

      StringBuilder url = new StringBuilder((int)maxLen);

      Dim sb As System.Text.StringBuilder

      sb = New System.Text.StringBuilder(INTERNET_MAX_URL_LENGTH)

        [MarshalAs(UnmanagedType.LPWStr)] out StringBuilder pServerPrincName, out IntPtr

    StringBuilder pServerPrincName = new StringBuilder();

   [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder oszName);

    ByVal oszName As StringBuilder) As Integer

   [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pszUserType);

            StringBuilder sb = new StringBuilder();

   [Out] StringBuilder lpsz,

static extern public int DTL_C_DEFINE(ref int name_id, StringBuilder def);

    public static void DtlErrorS(int dtlSts, StringBuilder msg, int buffSize)

    public static int DtlVersion(StringBuilder versionText, int maxCharsToReturn)

    public static int DtlCDefine(ref int nameId, StringBuilder defString)

        static extern public void DTL_ERROR_S(int iostat, StringBuilder msg, int buffsz);

        static extern public int DTL_VERSION(StringBuilder sb, int maxChars);

        static extern public int DTL_C_DEFINE(ref int name_id, StringBuilder def);

        var msg = new StringBuilder(256);

        var definition = new StringBuilder(256);

    public static void DtlErrorS(int dtlSts, StringBuilder msg, int buffSize)

    public static int DtlVersion(StringBuilder versionText, int maxCharsToReturn)

    public static int DtlCDefine(ref int nameId, StringBuilder defString)

        static extern public void DTL_ERROR_S(int iostat, StringBuilder msg, int buffsz);

        static extern public int DTL_VERSION(StringBuilder sb, int maxChars);

        static extern public int DTL_C_DEFINE(ref int name_id, StringBuilder def);

    public static void DtlErrorS(int dtlSts, StringBuilder msg, int buffSize)

    public static int DtlVersion(StringBuilder versionText, int maxCharsToReturn)

    public static int DtlCDefine(ref int nameId, StringBuilder defString)

        static extern public void DTL_ERROR_S(int iostat, StringBuilder msg, int buffsz);

        static extern public int DTL_VERSION(StringBuilder sb, int maxChars);

        static extern public int DTL_C_DEFINE(ref int name_id, StringBuilder def);

        var msg = new StringBuilder(256);

static extern public void DTL_ERROR_S(int iostat, StringBuilder msg, int buffsz);

    public static void DtlErrorS(int dtlSts, StringBuilder msg, int buffSize)

    public static int DtlVersion(StringBuilder versionText, int maxCharsToReturn)

    public static int DtlCDefine(ref int nameId, StringBuilder defString)

        static extern public void DTL_ERROR_S(int iostat, StringBuilder msg, int buffsz);

        static extern public int DTL_VERSION(StringBuilder sb, int maxChars);

        static extern public int DTL_C_DEFINE(ref int name_id, StringBuilder def);

        var msg = new StringBuilder(256);