If the 'Visual Basic' is the VB6 I know, then The difference between VB6 and VB.NET is the way VB6, VB.NET pass the address or memory space of your data when you call an external Function in a DLL. 1) VB.NET obey the rule passed by value (ByVal) and it will copy the entire image of your data and pass the address into your external Function (in a DLL, etc). 2) VB6 does not do that. The proof of this is your Function can manipulate the data (Often a ByVal String) and when the function return, the VB6 can see what was changed with that space. 3) I like this VB6 behaviour for peace sake. Lately, I had a DLL use in VB6 and ported it into VB.NET and It does not work the way I know it, only to find-out I had to create another Function that accept a pointer to String address, (char **) in C/C++, Or create a public structure and put all those String variables that previously use as pass ByVal in VB6 application---lots of work, but that what porting is about---to make your existing codes work on another environment.

TMALBONPH

' you need to add the following code to fix it ' on the same file where your Register_FormClosing is, declare this Private if_already_close As Integer ' inside your Register_FormClosing, add ' before Dim exitChoice If if_already_close <> 1234 Then if_already_close = 1234 ' your MessageBox.Show(...) codes here End If ' before the End Sub

TMALBONPH

insert space between `/' and '*' like this `*px/ *py << std::endl;" it will compile on VC6

TMALBONPH