Generated image of Html Page not showing the gradient color in the generated image?

Generated image of Html Page not showing the gradient color in the
generated image?

Hi I am working on c# web project I am creating a Image from html page
using web-browser control in c#.
But I have a problem in my html page we have some html control like div
image etc. when i am trying to create image of the html page the image is
generated successfully with all background color of div and images.
But problem is that if I once i use the gradient color as background and
create an image of the html page than in the image gradient color is not
showing while all color and images are showing perfectly.
Code which i use to generate image
public class WebsiteThumbnailImageGenerator { public static Bitmap
GetWebSiteThumbnail(string Url, int BrowserWidth, int BrowserHeight, int
ThumbnailWidth, int ThumbnailHeight) { WebsiteThumbnailImage
thumbnailGenerator = new WebsiteThumbnailImage(Url, BrowserWidth,
BrowserHeight, ThumbnailWidth, ThumbnailHeight); return
thumbnailGenerator.GenerateWebSiteThumbnailImage(); }
private class WebsiteThumbnailImage
{
public WebsiteThumbnailImage(string Url, int BrowserWidth, int
BrowserHeight, int ThumbnailWidth, int ThumbnailHeight)
{
this.m_Url = Url;
this.m_BrowserWidth = BrowserWidth;
this.m_BrowserHeight = BrowserHeight;
this.m_ThumbnailHeight = ThumbnailHeight;
this.m_ThumbnailWidth = ThumbnailWidth;
}
private string m_Url = null;
public string Url
{
get
{
return m_Url;
}
set
{
m_Url = value;
}
}
private Bitmap m_Bitmap = null;
public Bitmap ThumbnailImage
{
get
{
return m_Bitmap;
}
}
private int m_ThumbnailWidth;
public int ThumbnailWidth
{
get
{
return m_ThumbnailWidth;
}
set
{
m_ThumbnailWidth = value;
}
}
private int m_ThumbnailHeight;
public int ThumbnailHeight
{
get
{
return m_ThumbnailHeight;
}
set
{
m_ThumbnailHeight = value;
}
}
private int m_BrowserWidth;
public int BrowserWidth
{
get
{
return m_BrowserWidth;
}
set
{
m_BrowserWidth = value;
}
}
private int m_BrowserHeight;
public int BrowserHeight
{
get
{
return m_BrowserHeight;
}
set
{
m_BrowserHeight = value;
}
}
public Bitmap GenerateWebSiteThumbnailImage()
{
Thread m_thread = new Thread(new
ThreadStart(_GenerateWebSiteThumbnailImage));
m_thread.SetApartmentState(ApartmentState.STA);
m_thread.Start();
m_thread.Join();
return m_Bitmap;
}
private void _GenerateWebSiteThumbnailImage()
{
WebBrowser m_WebBrowser = new WebBrowser();
m_WebBrowser.ScrollBarsEnabled = false;
m_WebBrowser.Navigate(m_Url);
m_WebBrowser.DocumentCompleted += new
WebBrowserDocumentCompletedEventHandler(WebBrowser_DocumentCompleted);
while (m_WebBrowser.ReadyState != WebBrowserReadyState.Complete)
Application.DoEvents();
m_WebBrowser.Dispose();
}
private void WebBrowser_DocumentCompleted(object sender,
WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser m_WebBrowser = (WebBrowser)sender;
m_WebBrowser.ClientSize = new Size(this.m_BrowserWidth,
this.m_BrowserHeight);
m_WebBrowser.ScrollBarsEnabled = false;
m_Bitmap = new Bitmap(m_WebBrowser.Bounds.Width,
m_WebBrowser.Bounds.Height);
m_WebBrowser.BringToFront();
m_WebBrowser.DrawToBitmap(m_Bitmap, m_WebBrowser.Bounds);
m_Bitmap = (Bitmap)m_Bitmap.GetThumbnailImage(m_ThumbnailWidth,
m_ThumbnailHeight, null, IntPtr.Zero);
}
}