When I Debug Capture Button Code Line By Line It Capture Image But When I Remove Debug Point And Run Application And Click On Capture Button It Was Not Capturing Image

        private void btnCaptureIage_Click(object sender, EventArgs e)
        {
         webBrowser1.Select();   
           Application.DoEvents();
            Bitmap bitmap = new Bitmap(webBrowser1.Width, webBrowser1.Height);
            webBrowser1.DrawToBitmap(bitmap, new Rectangle(0, 0, 
            webBrowser1.Width,webBrowser1.Height));                     
            pictureBox1.BackgroundImage = bitmap;
            Application.DoEvents();
}