private struct PROCESSENTRY32

    static extern bool Process32First([In]IntPtr hSnapshot, ref PROCESSENTRY32 lppe);

    static extern bool Process32Next([In]IntPtr hSnapshot, ref PROCESSENTRY32 lppe);

        PROCESSENTRY32 procEntry = new PROCESSENTRY32();

        procEntry.dwSize = (UInt32)Marshal.SizeOf(typeof(PROCESSENTRY32));

PROCESSENTRY32, Process32First, Process32Next

static extern bool Process32First(IntPtr hSnapshot, ref PROCESSENTRY32 lppe);

Private Shared Function Process32First(ByVal hSnapshot As IntPtr, ByRef lppe As PROCESSENTRY32) As Boolean

PROCESSENTRY32

static extern bool Process32Next(IntPtr hSnapshot, ref PROCESSENTRY32 lppe);

Private Shared Function Process32Next(ByVal hSnapshot As IntPtr, ByRef lppe As PROCESSENTRY32) As Boolean

PROCESSENTRY32

public struct PROCESSENTRY32

Public Structure PROCESSENTRY32

I found a different PROCESSENTRY32 structure I needed to use on Windows Mobile (6.x)

    public struct PROCESSENTRY32