Weird problem using WebClient to download...

[4xzer0]

Hi i am using WebClient do download a picture/image. The code I am using is:

Dim m1(-1) As Byte
        Dim url As String = "urlhere"
        Dim dbyte As New System.Net.WebClient
        
        dbyte.Headers.Add("Cookie", CookieString)
 
        Dim memstream As New System.IO.MemoryStream
 
        m1 = dbyte.DownloadData(url)
        memstream.Write(m1, 0, m1.Length)
        PictureBox1.Image = Image.FromStream(memstream)
        PictureBox1.Size = PictureBox1.Image.Size
        PictureBox1.Refresh()

If I load up my app, and use this code, it will freeze for about 5-10 seconds and then download the image and display it fine. If I continue using the code it will work fine and download the image normally without freezing.

Can anyone help me stop it from freezing the first time it is used? Thanks