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Dim lines As String() = IO.File.ReadAllLines(FILE_NAME) If System.IO.File.Exists(FILE_NAME) = True Then For i = 0 To lines.Count - 1 Dim userkey As String = System.IO.File.ReadAllLines(FILE_NAME)(i) If key.Text.Contains(userkey) Then 'shows many msgs at once i want to show only one msg MsgBox("Thanks for registering ") Else End If If Not key.Text.Contains(userkey) … |