.NET Load web browser while sleep rest of code?

Code
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        'My.Computer.FileSystem.DeleteFile("C:\Users\Simon\Documents\Visual Studio 2010\Projects\#\#\bin\Release\captcha12.jpg")

 

        UseProxy(RichTextBox2.Text)

        WebBrowser1.Navigate("http://cc.cc/capt/capt.php?sc=1cve")

 

 

 

        Dim both As Bitmap = New Bitmap(570, 147, Imaging.PixelFormat.Format32bppArgb)

        ' Create a Graphics object that will process the screen shot

        Dim gfx As Graphics = Graphics.FromImage(both)

        ' Copy the screen contents

        gfx.CopyFromScreen(0, 0, -80, -240, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy)

        ' Save the resulting graphics

 

        both.Save("captcha12.jpg", Imaging.ImageFormat.Jpeg)

 

        PictureBox1.Image = Image.FromFile("C:\Users\Simon\Documents\Visual Studio 2010\Projects\#\#\bin\release\captcha12.jpg")

 

 

 

        Button4.PerformClick()

 

        'sw.Start()

        'Do

        'Application.DoEvents()

        ' Loop Until sw.ElapsedMilliseconds >= 5000

        'sw.Stop()

 

 

        WebBrowser1.Document.GetElementById("adcopy_response").InnerText = RichTextBox3.Text

 

 

 

        'My.Computer.FileSystem.DeleteFile("C:\Users\Simon\Documents\Visual Studio 2010\Projects\#\#\bin\Release\captcha12.jpg")

    End Sub