StringBuilder Buffer,

         ByVal Buffer As System.Text.StringBuilder, _

Use of StringBuilder to create a variable to obtain the Manufacturer string instead of using MarshalAs. This approach is cleaner and doesn't require defining a Struct.

StringBuilder manufacturerString = new StringBuilder(128);

static extern UInt32 PdhLookupPerfNameByIndex(string szMachineName, uint dwNameIndex, StringBuilder szNameBuffer, ref uint pcchNameBufferSize);

StringBuilder buffer = new StringBuilder(1024);

   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

   [Out] StringBuilder buffer, out int BufferSize,

   [Out] StringBuilder RoutingInfoBuffer, out int RoutingInfoBufferSize);

   [Out] StringBuilder RoutingInfoBuffer, int RoutingInfoBufferSize);

public static extern bool GetDefaultPrinter(StringBuilder pszBuffer, ref int pcchBuffer);

(ByVal pszBuffer As System.Text.StringBuilder, ByRef pcchBuffer As Int32) As Boolean

    StringBuilder pszBuffer = new StringBuilder(pcchBuffer);

    static extern bool GetPrinterDriverDirectory(StringBuilder pName,

                              StringBuilder pEnv,

                              [Out] StringBuilder outPath,

        StringBuilder str = new StringBuilder(1024);

    static extern bool GetPrinterDriverDirectory(StringBuilder pName,

                              StringBuilder pEnv,

                              [Out] StringBuilder outPath,

        StringBuilder str = new StringBuilder(1024);

    static extern bool GetPrinterDriverDirectory(StringBuilder pName,

                              StringBuilder pEnv,

                              [Out] StringBuilder outPath,

        StringBuilder str = new StringBuilder();

static extern bool GetPrintProcessorDirectory(StringBuilder pName, StringBuilder pEnv, int Level, [Out] StringBuilder outPath, int bufferSize,

    static extern bool GetPrintProcessorDirectory(StringBuilder pName,

                          StringBuilder pEnv,

                          [Out] StringBuilder outPath,

    StringBuilder str = new StringBuilder();

public static extern SQL_RETURN_CODE    SQLInstallerError(int iError, ref SQL_INSTALLER_ERROR_CODE pfErrorCode, StringBuilder lpszErrorMsg, int cbErrorMsgMax, ref int pcbErrorMsg);

Public Shared Function SQLInstallerError(ByVal iError As Integer, ByRef pfErrorCode As Integer, ByVal lpszErrorMsg As StringBuilder, ByVal cbErrorMsgMax As Integer, ByRef pcbErrorMsg As Integer) As SQL_RETURN_CODE

StringBuilder         errorMesg        = new StringBuilder( 512 ) ;

Dim errorMsg As New StringBuilder(512)

        StringBuilder strSid = new StringBuilder();

                           <[In](), Out(), [Optional]()> ByVal lpCommandLine As StringBuilder, _

Use StringBuilder for lpCommandLine parameter for unicode version of this function.

    StringBuilder pszProvName,

    StringBuilder pszProvName,

    StringBuilder pszProvName,

    StringBuilder pszName;

        pszName = new StringBuilder(cbName);

         System.Text.StringBuilder pszProvName,

         System.Text.StringBuilder pszTypeName,

     $pszTypeName = New-Object Text.StringBuilder

     $pszProvName = New-Object Text.Stringbuilder

    System.Text.StringBuilder pszTypeName,

    StringBuilder pszProvName,

StringBuilder providerName = new StringBuilder(255);

   [MarshalAs(UnmanagedType.LPStr)] StringBuilder pbData,

    StringBuilder _buffer = new StringBuilder();

    StringBuilder _account = new StringBuilder(_bufferSize);

    StringBuilder _domain = new StringBuilder(_bufferSize);

   Dim sb As New StringBuilder

   Dim sb As New StringBuilder

static extern bool GetUserName(System.Text.StringBuilder sb, ref Int32 length);

Public Function GetUserName(<MarshalAs(UnmanagedType.LPTSTR)>sb As System.Text.StringBuilder, _

        static extern bool GetUserName(StringBuilder lpBuffer, ref int nSize);    

            StringBuilder Buffer = new StringBuilder(64);

        Public Function GetUserName(<MarshalAs(UnamagedType.LPTSTR)>System.Text.StringBuilder sb, _

            Dim Buffer = new StringBuilder(64)

public static extern bool GetUserName(System.Text.StringBuilder sb, ref Int32 length);

$str = New-Object System.Text.StringBuilder -ArgumentList $size

        StringBuilder ReferencedDomainName,

        StringBuilder referencedDomainName = new StringBuilder();

    StringBuilder ReferencedDomainName,

Private Shared Function LookupAccountName(lpSystemName As String, lpAccountName As String, <MarshalAs(UnmanagedType.LPArray)> Sid As Byte(), ByRef cbSid As UInteger, ReferencedDomainName As StringBuilder, ByRef cchReferencedDomainName As UInteger, peUse As SID_NAME_USE) As Boolean

            StringBuilder ReferencedDomainName,

            StringBuilder referencedDomainName = new StringBuilder();

    Dim refDomainName As New StringBuilder

    System.Text.StringBuilder lpName,

    System.Text.StringBuilder ReferencedDomainName,

      StringBuilder lpName,

      StringBuilder ReferencedDomainName,

      StringBuilder name = new StringBuilder();

      StringBuilder referencedDomainName = new StringBuilder();

    System.Text.StringBuilder displayName,  // out

This is one of those "call twice" functions, so this error is just daily life. When it returns with this error, the byte count (cbDisplayName) will be set to what you need. Call EnsureCapacity on your StringBuilder and go round again.

   System.Text.StringBuilder lpName,

System.Text.StringBuilder sb = new System.Text.StringBuilder();

    //StringBuilder and size for the domain name

    StringBuilder aDomainName = new StringBuilder();

    aDomainName = new StringBuilder( aNameSize );

    public static extern IntPtr pcap_lookupdev( StringBuilder errbuf );

    public static extern IntPtr pcap_lookupdev( StringBuilder errbuf );

    StringBuilder lpName,

   ByVal lpName As StringBuilder, _

   Dim sb As New StringBuilder(MAX_REG_KEYNAME_SIZE + 1)

      StringBuilder lpValueName,

   ByVal lpValueName As StringBuilder, _

   Dim sb As New StringBuilder(MAX_REG_KEYNAME_SIZE + 1)

      StringBuilder keyBuffer = new StringBuilder((int)size);

      StringBuilder keyBuffer = new StringBuilder((int)size);

    System.Text.StringBuilder lpData,

    ByVal lpData As System.Text.StringBuilder, _

Dim KeyValue As System.Text.StringBuilder

    KeyValue = New System.Text.StringBuilder(KeyValueLength)

    System.Text.StringBuilder pvData = new System.Text.StringBuilder(1024);

      StringBuilder keyBuffer = new StringBuilder();

    System.Text.StringBuilder lpData,

    ByVal lpData As System.Text.StringBuilder, _

Dim KeyValue As System.Text.StringBuilder

    KeyValue = New System.Text.StringBuilder(KeyValueLength)

    System.Text.StringBuilder pvData = new System.Text.StringBuilder(1024);

      StringBuilder keyBuffer = new StringBuilder();

    StringBuilder vetoName,

            StringBuilder ddBaseName,

                StringBuilder sb = new StringBuilder(1000);

            StringBuilder strbld = new StringBuilder(1024);

    StringBuilder ddBaseName,

            StringBuilder ddBaseName,

                StringBuilder sb = new StringBuilder(1000);

static extern uint GetModuleBaseName(IntPtr hProcess, IntPtr hModule, StringBuilder lpBaseName, uint nSize);

static extern uint GetModuleFileNameEx(IntPtr hProcess, IntPtr hModule, [Out] StringBuilder lpBaseName, [In] [MarshalAs(UnmanagedType.U4)] int nSize);

Public Shared Function GetModuleFileNameEx(ByVal hProcess As IntPtr, ByVal hModule As IntPtr, <Out()> ByVal lpBaseName As StringBuilder, <[In]()> <MarshalAs(UnmanagedType.U4)> ByVal nSize As Integer) As UInteger

static extern uint GetModuleFileNameEx(IntPtr hProcess, IntPtr hModule, [Out] StringBuilder lpBaseName, uint nSize);

            StringBuilder strbld = new StringBuilder(1024);

    [Out] StringBuilder lpImageFileName,

    <Out> lpImageFileName As StringBuilder,

StringBuilder fileName = new StringBuilder(2000);

                StringBuilder valuesBuffer = new StringBuilder();

                StringBuilder valuesBuffer = new StringBuilder();

        StringBuilder user,

        StringBuilder domain,

    StringBuilder userBuilder = new StringBuilder();

    StringBuilder domainBuilder = new StringBuilder();

            StringBuilder userName,

            StringBuilder password,

                            byval UserName as StringBuilder, _

                            byval password AS StringBuilder, _

  StringBuilder user = new StringBuilder(MAX_USER_NAME);

  StringBuilder pwd = new StringBuilder(MAX_PASSWORD);

            StringBuilder userName,

            StringBuilder password,

                            byref UserName as StringBuilder, _

                            byref password AS StringBuilder, _

  StringBuilder user = new StringBuilder(MAX_USER_NAME);

  StringBuilder pwd = new StringBuilder(MAX_PASSWORD);

private static extern bool CredUnPackAuthenticationBuffer(int dwFlags, IntPtr pAuthBuffer, uint cbAuthBuffer, StringBuilder pszUserName, ref int pcchMaxUserName, StringBuilder pszDomainName, ref int pcchMaxDomainame, StringBuilder pszPassword, ref int pcchMaxPassword);

                              ByVal pszUserName As StringBuilder, ByRef pcchMaxUserName As UInt32, _

                              ByVal pszDomainName As StringBuilder, ByRef pcchMaxDomainName As UInt32, _

                              ByVal pszPassword As StringBuilder, ByRef pcchMaxPassword As UInt32) As <MarshalAs(UnmanagedType.Bool)> Boolean

private static extern bool CredUnPackAuthenticationBuffer(int dwFlags, IntPtr pAuthBuffer, uint cbAuthBuffer, StringBuilder pszUserName, ref int pcchMaxUserName, StringBuilder pszDomainName, ref int pcchMaxDomainame, StringBuilder pszPassword, ref int pcchMaxPassword);

     var usernameBuf = new StringBuilder(100);

     var passwordBuf  = new StringBuilder(100);

     var domainBuf = new StringBuilder(100);

                StringBuilder sb = new StringBuilder();

     Dim sb As New StringBuilder()

            var builder = new StringBuilder((int) length);

            var builder = new StringBuilder((int) length);

            var builder = new StringBuilder((int) length);

            var builder = new StringBuilder((int) length);

            var builder = new StringBuilder((int) length);

            var builder = new StringBuilder((int) length);

            var builder = new StringBuilder((int) length);

            var builder = new StringBuilder((int) length);

System.Text.StringBuilder sbDisplayName = new System.Text.StringBuilder(256);

using LPTSTR = System.Text.StringBuilder;

Imports LPTSTR = System.Text.StringBuilder

public static bool CPAcquireContext(out IntPtr phProv, StringBuilder pszContainer, uint dwFlags, byte[] pVTable){

private static extern bool CPAcquireContextCe(out IntPtr phProv, StringBuilder pszContainer, uint dwFlags, byte[] pVTable);

private static extern bool CPAcquireContextXp(out IntPtr phProv, StringBuilder pszContainer, uint dwFlags, byte[] pVTable);

    public static extern long GetPackageFamilyName(IntPtr hProcess, ref uint packageFamilyNameLength, StringBuilder packageFamilyName);

    static extern int GetPackageFullName(IntPtr hProcess, ref UInt32 packageFullNameLength, StringBuilder fullName);