C# Signature:

[DllImport("coredll", EntryPoint="GlobalMemoryStatus", SetLastError=false)]
internal static extern void GlobalMemoryStatusCE(out MemoryStatus msce);

VB Signature:

<DllImport("coredll.dll")> Private Shared Function GlobalMemoryStatus(ByRef ms As MEMORYSTATUS) As Int32
End Function

User-Defined Types:

vb Memorystatus structure

Public Structure MEMORYSTATUS
    ''' <summary>
    ''' size of the structure
    ''' </summary>
    ''' <remarks> ms.dwLength = Marshal.SizeOf(ms)</remarks>
    Public dwLength As Int32
    ''' <summary>
    ''' % of used
    ''' </summary>
    ''' <remarks></remarks>
    Public dwMemoryLoad As Int32
    ''' <summary>
    ''' bytes of total ram
    ''' </summary>
    ''' <remarks></remarks>
    Public dwTotalPhys As Int32
    ''' <summary>
    ''' bytes of currently available ram
    ''' </summary>
    ''' <remarks></remarks>
    Public dwAvailPhys As Int32
    ''' <summary>
    ''' bytes in pageing (? not normally supported in Ce)
    ''' </summary>
    ''' <remarks></remarks>
    Public dwTotalPageFile As Int32
    ''' <summary>
    ''' bytes in pageing (? not normally supported in Ce)
    ''' </summary>
    ''' <remarks></remarks>
    Public dwAvailPageFile As Int32
    ''' <summary>
    ''' total virtual bytes can be used
    ''' </summary>
    ''' <remarks></remarks>
    Public dwTotalVirtual As Int32
    ''' <summary>
    ''' current virtual bytes available
    ''' </summary>
    ''' <remarks></remarks>
    Public dwAvailVirtual As Int32
End Structure

C# MemoryStatus structure:

[StructLayout(LayoutKind.Sequential)]
internal struct MemoryStatus {
    /// <summary>
    /// Size of the structure
    /// </summary>
    public int dwLength { get; set; }
    /// <summary>
    /// Percentage of memory used
    /// </summary>
    public int dwMemoryLoad { get; set; }
    /// <summary>
    /// Total size in bytes of physical memory
    /// </summary>
    public int dwTotalPhys { get; set; }
    /// <summary>
    /// Available size in bytes of physical memory
    /// </summary>
    public int dwAvailPhys { get; set; }
    /// <summary>
    /// Total size in bytes of page file memory
    /// </summary>
    public int dwTotalPageFile { get; set; }
    /// <summary>
    /// Available size in bytes of page file memory
    /// </summary>
    public int dwAvailPageFile { get; set; }
    /// <summary>
    /// Total size in bytes of virtual memory
    /// </summary>
    public int dwTotalVirtual {get; set; }
    /// <summary>
    /// Available size in bytes of virtual memory
    /// </summary>
    public int dwAvailVirtual { get; set; }
}

Alternative Managed API:

GC.GetTotalMemory() can return the current memory in GC but no other details.

Notes:

Taken from openNetCF in OpenNETCF.Win32.Core

Tips & Tricks:

you can ignore the dwTotalPageFile and dwAvailPageFile as they are not supported

under CE

Sample Code:

    ''' <summary>
    ''' gets the memory status of the current ce platform
    ''' </summary>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public Shared Function GetMemory() As MEMORYSTATUS
    Dim ms As MEMORYSTATUS
    ms.dwLength = Marshal.SizeOf(ms)
    GlobalMemoryStatus(ms)
    Return ms
    End Function

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