Hi Bob
Thanks for replying! yes you guessed it right I am using same bitma
rather than creating new bitmap every few seconds. Hence probably i
wouldnt be good idea to dispose bitmap
as long as overlay needs to be shown. Any how I am posting some bit o
code

PHP code
-------------------
   
 
 
 namespace Overlays
 {
 public class Overlay
 {
 public String overlayText;
 public Color overlayTextColor;
 public Color overlayBackgroundColor;
 public String text;
 
 private IVideoWindow vw;
         private    IVMRMixerBitmap9 mbmp;
 
 
 Bitmap masterBmp = null;
 
 Font fon = null;
 private ArrayList arrayGuru;
 float alpha = 0;
 
    
 public Overlay(IVideoWindow vw, IVMRMixerBitmap9 mbmp)
 {
 this.vw = vw;
 this.mbmp = mbmp;
 System.Console.WriteLine("I am in OverlayCS Constructor");
 
 masterBmp = new Bitmap(750, 500, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
 masterBmp.MakeTransparent(Color.White);  
 
 
 //  InitializeDirect3D();
 }
 
 
 
 public void  OffOverlay()
         {
 VMR9AlphaBitmap alphaBmp;
 alphaBmp = new VMR9AlphaBitmap();
 
             int hr = mbmp.GetAlphaBitmapParameters(out alphaBmp);
             Marshal.GetExceptionForHR(hr);
            
 // Disable them
 alphaBmp.dwFlags =VMR9AlphaBitmapFlags.Disable;
 
 // Update the Alpha Bitmap Parameters
 hr = mbmp.UpdateAlphaBitmapParameters(ref alphaBmp);
 Marshal.GetExceptionForHR(hr);
 //masterG
 }
 
 public void  OnOverlay(ArrayList arrList,
 int distBetwSubRect,
 int distance,
 float alpha,
 int indexToBeHighlighted,
 string Action)
 {
 
 Graphics g = null;
 IntPtr hdc;
 IntPtr memDC ;
 IntPtr hBitmap ;
 Bitmap bmp = null;
 VMR9AlphaBitmap alphaBmp;
 alphaBmp =  new VMR9AlphaBitmap();
 this.alpha = alpha;  
 try
 {
 int hr = 0;
 arrayGuru=arrList;
 
 //GetBitmap();
 
 
 
 g = Graphics.FromImage(masterBmp);
 //g.Clear(Color.White);
 Navigate(indexToBeHighlighted, distBetwSubRect, distance);
 hdc = g.GetHdc();
 memDC = NativeMethodes.CreateCompatibleDC(hdc);
 hBitmap = masterBmp.GetHbitmap();
 NativeMethodes.SelectObject(memDC, hBitmap);
 
 // Set Alpha Bitmap Parameters for using a GDI DC
 alphaBmp.dwFlags = VMR9AlphaBitmapFlags.hDC |
 VMR9AlphaBitmapFlags.SrcColorKey |
 VMR9AlphaBitmapFlags.FilterMode;
 
 alphaBmp.hdc = memDC;
 alphaBmp.rSrc = new Foundation.Base.DShowNET.Default.DsRect(0, 0, masterBmp.Width, masterBmp.Height);
 alphaBmp.rDest = GetDestRectangle();
 alphaBmp.clrSrcKey = ColorTranslator.ToWin32(Color.White);
 alphaBmp.dwFilterMode = Foundation.Base.DShowNET.Default.VMRMixerPrefs.PointFiltering;
 alphaBmp.fAlpha = alpha;
 
 // Release GDI handles  
 
 hr = mbmp.SetAlphaBitmap(ref alphaBmp);
 g.ReleaseHdc(hdc);
 g.Dispose();
 
 }
 catch (Exception ex)
 {
 
 }
 finally
 {
 
 //bmp.Dispose();
 // bmp = null;
 g.Dispose();
 g = null;
 GC.Collect();
 }
 }
 
 
 
 NormalizedRect GetDestRectangle()
 {
 NormalizedRect rect = new  NormalizedRect();
 //rect.left =0.2f;
 //rect.top   =0.1f;
 //rect.right  = 0.9f;
 //rect.bottom = 0.3f;
 
 rect.left = 0.0f;
 rect.top = 0.0f;
 rect.right = 1.0f;
 rect.bottom = 0.7f;
 
         return rect;
 }
 
 private void Nav(int indexToBeHighlighted, int distBetwSubRect, int distance)
 {
 try
 {
 
 int y = 0;
 Graphics g = Graphics.FromImage(masterBmp);
 
 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
 g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
 
 //VMR9AlphaBitmap alphaBmp;
 //alphaBmp = new VMR9AlphaBitmap();
 
 for (int i = 0; i <= 5; i++)
 {
 if (i == indexToBeHighlighted)
 {
 g.DrawRectangle(Pens.Blue, new Rectangle(distance, y, 300, 50));//250
 g.FillRectangle(Brushes.Black, new Rectangle(distance, y, 300, 50));
 using(Font fon = new Font("Courier",18))
 g.DrawString(arrayGuru[i].ToString(),fon , Brushes.Blue, (distance + 25), (y+2));//275
 y = y + distanceBetweenSubtitleRectangles;//150
 }
 else
 {
 g.DrawRectangle(Pens.WhiteSmoke, new Rectangle(distance, y, 300, 50));//250
 g.FillRectangle(Brushes.Black, new Rectangle(distance, y, 300, 50));
 using(Font fon = new Font("Courier",18))
 g.DrawString(arrayGuru[i].ToString(), fon, Brushes.WhiteSmoke, (distance + 25), (y+2));//275
 y = y + distanceBetweenSubtitleRectangles;//150
 }
 }
 g.Dispose();
 
 }
 catch(Exception ex)
 {
 
 
 }
 
 
 
 }
 }
 }
--------------------

regds
TheIlliterate