Sure! Here's a Visual Basic .NET code that will rename all image files in a user specified directory supplied by a textbox using the format of "image-" followed by sequential numbers, keep the file extension the same, and include a submit button that fires the code:

```vb.net
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)
        i += 1
        File.Move(img, Path.Combine(Path.GetDirectoryName(img), "image-" & i.ToString("D4") & Path.GetExtension(img)))
    Next
End Sub
```

This code will rename all image files in the directory specified in the textbox supplied by the user with sequential numbers starting from 0001 and keep the file extension the same.

You can copy this code into your Visual Basic .NET project and add a textbox and a button to your form. Then you can set the Text property of the textbox to the path of the directory you want to rename image files in and set the Text property of the button to "Submit". Finally, you can double-click on the button to create an event handler for its Click event and paste this code into it.

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