[How to] Create random strings(upper,lower and integers)[Src]

[euverve]

A slight change version, with number of random strings to generate.

Code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If StrLength.TextLength <= 0 Then
            MsgBox("Input string length.")
        Else
            StrOutput.Text = RandomString(StrLength.Text)
        End If
    End Sub

    Function RandomString(ByVal val As Integer) As String
        RandomString = ""
        Const strUpper As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
        Const strLower As String = "abcdefghijklmnopqrstuvwxyz"
        Const strNumbers As String = "1234567890"
        Dim strTotal As String = strUpper & strLower & strNumbers
        Dim i As Short

        For i = 1 To CInt(val)
            RandomString = RandomString & Mid(strTotal, Int((Rnd() * Len(strTotal)) + 1), 1)
        Next i
    End Function

Screenshot: