[BEGINNER HElP] Multiple pictures extensions choices

Hello, i am writting a little program and i want to select a picture with one extensions but several possibilities. my first option is .png but i want to add ".gif"vpicture if "png" picture is not found.
i am starting in coding. i tried this:

Code:

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PictureBox9.Image = Image.FromFile(Application.StartupPath & "\DANfiles\challengersgif\" & Me.ComboBox1.Text & (".png" or ".gif"))

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but i have a error!
please! give me a hand ! i am looking for a solution. thank you in advance for your answer!

vb.net Code:

Dim filePath = Path.Combine(Application.StartupPath,
                            "DANfiles\challengersgif",
                            Me.ComboBox1.Text & ".png")
 
If Not File.Exists(filePath) Then
    filePath = Path.ChangeExtension(filePath, ".gif")
End If
 
'Use filePath here.

You may want to add a check to see that the second file path exists if there's a possibility that it might not.

Here's another option that incorporates a check for at least one existent file and can be easily extended to more extensions just by adding more elements to the array:

vb.net Code:

Dim filePath = Path.Combine(Application.StartupPath,
                            "DANfiles\challengersgif",
                            Me.ComboBox1.Text)
Dim extensions = {"png", "gif"}
 
filePath = extensions.Select(Function(ext) Path.ChangeExtension(filePath, ext)).
                      FirstOrDefault(Function(fp) File.Exists(fp))
 
If filePath IsNot Nothing Then
    'Use filePath here.
End If

ok thank you very much for your help