>Private Sub Button2_Click(ByVal sender As System.Object, ByVal
>e As System.EventArgs) Handles Button2.Click
> string par1="Prova";
> string par2="Prova2";
>string out=String.Format("cmd.exe /k \\\\{0}\\{1}",par1,par2);
> End Sub
Oh Attenzione 
Io te l'ho scritto in C# bisogna trasformarlo in VB.NET pensavo te ne fossi accorto:
Dim par1 as String
Dim par2 as String
Dim out as String
par1="Prova"
par2="Prova"
out=String.Format("cmd.exe /k \\{0}\{1}",par1,par2)
Console.WriteLine(out)
Prova così.
ciao
David De Giacomi | Microsoft MVP
http://blogs.dotnethell.it/david/