Error when importing system dll

I am receiving this error when trying to import a system dll.

Quote:

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error CS0246: The type or namespace name 'sysimport' could not be found (are you missing a using directive or assembly reference?)

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here is my code the line with the error is in red.

Code:

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// Calling out a Win32 API function

using System;
using System.Runtime.InteropServices;

class CH4_14
{
        [System.Runtime.InteropServices.StructLayoutAttribute
                        (LayoutKind.Sequential, CharSet=CharSet.Auto)]
        public struct _SYSTEM_INFO
        {
                public int dw0emID;
                public int dwPageSize;
                public int lpMinimumApplicationAdress;
                public int lpMaximumApplicationAddress;
                public int dwActiveProcessorMask;
                public int dwNumberOfProcessors;
                public int dwProcessorType;
                public int dwAllocationGranularity;
                public short wProcessorLevel;
                public short wProcessorRevision;
        }
       
        [sysimport(dll="Kernel32.dll")]
                unsafe private static extern void
                        GetSystemInfo([marshal(UnmanagedType.LPVoid)]uint* bufptr);
                       
        public static unsafe void Main()
        {
                try
                {
                        _SYSTEM_INFO si = new _SYSTEM_INFO();
                        GetSystemInfo((uint*)&si);
                        Console.WriteLine("Processor Type = {0}", si.dwProcessorType);
                        Console.WriteLine("Number of Processors = {0}", si.dwNumberOfProcessors);
                        Console.WriteLine("Processor Level = {0}", si.wProcessorLevel);
                        Console.WriteLine("Processor Revision = {0}", si.wProcessorRevision);
                }
               
                catch(Exception e)
                {
                        Console.WriteLine("Exception Caught! {0}", e);
                }
        }
}

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well I figured that error out...It's DLLImport("Kernel32.dll").

but now I am getting a new error on this line

error is "namespace 'marshal' can't be found."

Code:

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GetSystemInfo([marshal(UnmanagedType.LPVoid)]uint* bufptr);

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which I really don't understand..considering the marshal class is located under the System.Runtime.InteropServices namespace.

Well , dll in C# really sucks . What I do usually is : try to get it in C# first , if that was hard , then I put that dll and VB.NET class and export the dll , and use it within C# proj . Less time-consuming I believe .

I think the m in marshall should be uppercase.