VB.NET Signature:

<DllImport("kernel32.dll", SetLastError:=True)> _
    Public Shared Function WriteProcessMemory(
    ByVal hProcess As IntPtr,
    ByVal lpBaseAddress As IntPtr,
    ByVal lpBuffer As Byte(),
    ByVal nSize As Int32,
    <Out()> ByRef lpNumberOfBytesWritten As IntPtr) As Boolean
    End Function