Screenshots for SWF Files in C#

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C#

Hello
I am trying to generate screenshots for swf by loading them in webbrowser in visual c# . i use openfiledialog() to select my SWF Files
i have used the function of webbrowser WebBrowser.DrawtoBitmap(), but i get blank images
below is my code
help will be appreciated

Quote:

namespace WindowsFormsApplication3
{
public partial class Form1 : Form
{

public WebBrowser wb = new WebBrowser();
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{


this.openFileDialog1.ShowDialog();
string[] files = openFileDialog1.FileNames;
foreach (string nam in files)
{
try
{

string url = @"file:///" + nam;
wb.Navigate(url);
Bitmap b = new Bitmap(wb.Width, wb.Height);
wb.DrawToBitmap(b, new Rectangle(0, 0, wb.Width, wb.Height));
b.Save(@"D:\copy\" + Path.GetFileNameWithoutExtension(nam) + ".png", System.Drawing.Imaging.ImageFormat.Png);
wb.Dispose();

}

catch
{ }

}

}

}

}