Public Function random_key(ByVal lenght As Integer) As String
Randomize()
Dim s As New System.Text.StringBuilder("")
Dim b() As Char = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".ToCharArray()
For i As Integer = 1 To lenght
Randomize()
Dim z As Integer = Int(((b.Length - 2) - 0 + 1) * Rnd()) + 1
s.Append(b(z))
Next
Return s.ToString
Console.WriteLine(s.ToString)
End Function
s=textbox1.text などのように印刷したい...