Public Structure TMProduct
        <VBFixedString(25)> Public productline As String
        <VBFixedString(25)> Public hinban As String
        <VBFixedString(25)> Public shortcode As String
        <VBFixedString(25)> Public fusible As String
        Public nutcount As Integer
        <VBFixedArray(11)> Public nuts() As Integer
        <VBFixedString(512), VBFixedArray(11)> Public tips() As String
End Structure

in VB6 the length of this structure is "12514"
and I used LenB function.

but LenB is not supported in VB.Net
I've reading on some other forums that they use Marshal.SizeOf
but in my case it doesn't do as LenB

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In order to compute the length of a structure mostly you'll need to create a default (dummy) instance of it an then compute their size.

Maybe this code, from Jim Mischel, is valid for you:

public static int GetSize<T>()
  Type tt = typeof(T);
  int size;
  if (tt.IsValueType)
    if (tt.IsGenericType)
      Console.WriteLine("{0} is a generic value type", tt.Name);
      var t = default(T);
      size = Marshal.SizeOf(t);
      Console.WriteLine("{0} is a value type", tt.Name);
      size = Marshal.SizeOf(tt);
    Console.WriteLine("{0} is a reference type", tt.Name);
    size = IntPtr.Size;
  Console.WriteLine("Size = {0}", size);
  return size;

Then call it using int structsize = GetSize(TMProduct) The Console output is just for debugging purposes an can be easely removed :)

Hope this helps

commented: nothing personal, just .cs code in .vb forum. -3

didn't tried it but thanks, I didn't use structures anymore coz i'm not very familiar with it and fileput.. anyway thanks again

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