C# Signature:

    [DllImport("Netapi32.dll")]
    private static extern uint NetShareAdd(
        [MarshalAs(UnmanagedType.LPWStr)] string strServer,
        Int32 dwLevel,
        ref SHARE_INFO_502 buf,
        out uint parm_err
    );

VB Signature:

Declare Unicode Function NetShareAdd Lib "netapi32.dll" ( _
            <MarshalAs(UnmanagedType.LPWStr)> _
            ByVal servername As String, _
            ByVal level As Integer, _
            ByRef buf As SHARE_INFO_2, _
            ByRef parm_err As Integer) As Integer
        {
            STYPE_DISKTREE = 0,
            STYPE_PRINTQ = 1,
            STYPE_DEVICE = 2,
            STYPE_IPC = 3,
            STYPE_TEMPORARY = 0x40000000,
            STYPE_SPECIAL = 0x80000000,
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct SHARE_INFO_502
        {
            [MarshalAs(UnmanagedType.LPWStr)] public string shi502_netname;
            public SHARE_TYPE shi502_type;
            [MarshalAs(UnmanagedType.LPWStr)] public string shi502_remark;
            public Int32 shi502_permissions;
            public Int32 shi502_max_uses;
            public Int32 shi502_current_uses;
            [MarshalAs(UnmanagedType.LPWStr)] public string shi502_path;
            [MarshalAs(UnmanagedType.LPWStr)] public string shi502_passwd;
            public Int32 shi502_reserved;
            public IntPtr shi502_security_descriptor;
        }

VB User-Defined Types:

    Public Enum NetError
        NERR_Success = 0
        ERROR_ACCESS_DENIED = 5
        ERROR_INVALID_PARAMETER = 87
        ERROR_INVALID_NAME = 123
        ERROR_INVALID_LEVEL = 124
        NERR_BASE = 2100
        NERR_UnknownDevDir = (NERR_BASE + 16)
        NERR_RedirectedPath = (NERR_BASE + 17)
        NERR_DuplicateShare = (NERR_BASE + 18)
        NERR_BufTooSmall = (NERR_BASE + 23)
    End Enum

    #Region "SHARE_TYPE Enumeration Definition"
    ' <summary>Type of share</summary>
    Public Enum ShareType
        ' <summary>Disk Share</summary>
        Disk = 0
        ' <summary>Printer Share</summary>
        Printer = 1
        ' <summary>Device Share</summary>
        Device = 2
        ' <summary>IPC Share</summary>
        IPC = 3
        ' <summary>Special Share</summary>
        ' <remarks>
        ' Add this value to one of the above values
        ' to get an Administrative Share of that type
        ' </remarks>
        Temporary = &H40000000
        Special = &H80000000
    End Enum
    #End Region

    #Region "SharePermissions Enum Definition"
    Public Enum SharePermissions
        ACCESS_NONE =    0
        ACCESS_READ =    1
        ACCESS_WRITE =    2
        ACCESS_CREATE =    4
        ACCESS_EXEC =    8
        ACCESS_DELETE =    &H10
        ACCESS_ATRIB =    &H20
        ACCESS_PERM =    &H40
        ACCESS_ALL =    ACCESS_READ + _
                ACCESS_WRITE + _
                ACCESS_CREATE + _
                ACCESS_EXEC + _
                ACCESS_DELETE + _
                ACCESS_ATRIB + _
                ACCESS_PERM
        ACCESS_GROUP = &H8000
    End Enum
    #End Region

    #Region "SHARE_INFO_2 Structure Definition"
    <StructLayout(LayoutKind.Sequential)> _
    Public Structure SHARE_INFO_2
        <MarshalAs(UnmanagedType.LPWStr)> _
        Public shi2_netname As String
        <MarshalAs(UnmanagedType.U4)> _
        Public shi2_type As ShareType
        <MarshalAs(UnmanagedType.LPWStr)> _
        Public shi2_remark As String
        <MarshalAs(UnmanagedType.U4)> _
        Public shi2_permissions As SharePermissions
        <MarshalAs(UnmanagedType.U4)> _
        Public shi2_max_uses As Integer
        <MarshalAs(UnmanagedType.U4)> _
        Public shi2_current_uses As Integer
        <MarshalAs(UnmanagedType.LPWStr)> _
        Public shi2_path As String
        <MarshalAs(UnmanagedType.LPWStr)> _
        Public shi2_passwd As String

    Public Sub New( _
        ByVal netName As String, _
        ByVal type As ShareType, _
        ByVal remark As String, _
        ByVal maxUses As Integer, _
        ByVal path As String, _
        ByVal permissions As SharePermissions, _
        ByVal passwd As String)

        shi2_netname = netName
        shi2_type = type
        shi2_remark = remark
        shi2_permissions = permissions
        shi2_max_uses = maxUses
        shi2_current_uses = 0
        shi2_path = path
        shi2_passwd = passwd
    End Sub

    End Structure
    #End Region

Notes:

[2004-06-11]
VB Def and Sample code added by RACKLEY
VB Def and enums updated by SPASCOE

Tips & Tricks:

This function will take as it's third parameter, a number of structures. The second parameter defines which level the third parameter structure is. Acceptable structures are SHARE_INFO_2, SHARE_INFO_502, and under Windows 9x/ME, SHARE_INFO_50.

C# Sample Code:

    string shareName = "testshare";
    string shareDesc = "This is a test share kekelar2000";
    string path = @"C:\MyShareDirectory"; // do not append comma, it'll fail

    SHARE_INFO_502 info = new SHARE_INFO_502();
    info.shi502_netname = shareName;
    info.shi502_type = SHARE_TYPE.STYPE_DISKTREE;
    info.shi502_remark = shareDesc;
    info.shi502_permissions = 0;    // ignored for user-level security
    info.shi502_max_uses = -1;
    info.shi502_current_uses = 0;    // ignored for set
    info.shi502_path = path;
    info.shi502_passwd = null;        // ignored for user-level security
    info.shi502_reserved = 0;
    info.shi502_security_descriptor = IntPtr.Zero;

    uint error = 0;
    uint result = NetShareAdd(server, 502, ref info, out error);

VB.NET Sample Code:

Dim shi2 As SHARE_INFO_2

' Populate the structure with information
shi2.shi2_netname = sharename"      ' share name
shi2.shi2_type = ShareType.Disk     ' disk drive
shi2.shi2_remark = ""           ' share comment
shi2.shi2_permissions = SharePermissions.ACCESS_NONE
shi2.shi2_max_uses = -1        ' unlimited    
shi2.shi2_current_uses = 0
shi2.shi2_path = "c:\myshare"
shi2.shi2_passwd = Nothing      ' no password

retval = NetShareAdd(ServerName, 2, shi2, Nothing)

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