VB.NET function to generate Random String

In our app many time we required a random string. Whether it is to make the URL unique or to Valid an user or a dynamic Cookie random string is very useful. In the below function I am generating a Random string using String Builder methods from System.IO.

Private Function RandomString(ByVal size As Integer, ByVal lowerCase As Boolean) As String
Dim builder As New StringBuilder()
Dim random As New Random()
Dim ch As Char
Dim i As Integer
For i = 0 To size - 1
ch = Convert.ToChar(Convert.ToInt32((26 * random.NextDouble() + 65)))
builder.Append(ch)
Next i
If lowerCase Then
Return builder.ToString().ToLower()
End If
Return builder.ToString()
End Function

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