Good catch! You're right, the current code will overwrite an existing file if it has the same sequential number and extension as another file. Additionally, it will throw an exception if a file in the directory doesn't have an extension.

Here's a revised code that will address these issues:

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim i As Integer = 0
Dim path As String = TextBox1.Text
For Each img As String In Directory.GetFiles(path).OrderBy(Function(f) New FileInfo(f).CreationTime)
If Path.GetExtension(img) <> "" Then
i += 1
Dim newFileName As String = Path.Combine(Path.GetDirectoryName(img), "image-" & i.ToString("D4") & Path.GetExtension(img))
While File.Exists(newFileName)
i += 1
newFileName = Path.Combine(Path.GetDirectoryName(img), "image-" & i.ToString("D4") & Path.GetExtension(img))
End While
File.Move(img, newFileName)
End If
Next
End Sub

This code will first sort the files by their creation time, to ensure that they are numbered in the order they were created. It will also check if a file with the same sequential number and extension already exists, and if so, it will add 1 to the sequential number until it finds an available name.

Additionally, it will skip files that do not have an extension to avoid throwing an exception.

I hope this helps! Let me know if you have any further questions.
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