[3booody]

اخي شغلة التكرار ما اعرف بها لكن اذا ردت رقم عشوائي أو حرف من عدة حروف عشوائي استخدم

Imports vb = Microsoft.VisualBasic

Public Class Form1
Const num As String = "0123456789"
Dim Res As String

Public Function RandX(ByVal HightX As Short) As Short
Randomize(VB.Timer())
RandX = CShort(Int(Rnd() * HightX) + 1)
End Function

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Res = ""
Do
Res = Res & Mid(num, RandX(62), 1)
Loop Until Len(Res) = 4
TextBox1.Text=Res
End Sub