Image Control Showing Deleted Image in wpf

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C#

WPF

I am creating wpf application. I am showing the preview image(which is taken by cam) in Image control. The image get saved by default. If the user want to retake the photo i am deleting the current image.

int imageCount = Directory.GetFiles(imgDir, "*",SearchOption.TopDirectoryOnly).Length;

  ImageFormat imgFormat = (ImageFormat)GetValue(SnapshotFormatProperty);

   string filePath = Path.Combine(imgDir, "IMAGE_" + ++imageCount + ".Jpeg");

                using (Bitmap bmp = new Bitmap(panelWidth, panelHeight))
                {
                    using (Graphics graphics = Graphics.FromImage(bmp))
                    {
                        // image
                    }
                    bmp.Save(filePath, imgFormat);
                }
                globalFilePath = filePath;

showing image in Image Control

string strUri = String.Format(WebCamControl.globalFilePath);
           previewImage.Source = BitmapFromUri(new Uri(strUri));

public static ImageSource BitmapFromUri(Uri source)
        {
            var bitmap = new BitmapImage();
            bitmap.BeginInit();
            bitmap.UriSource = source;
            bitmap.CacheOption = BitmapCacheOption.OnLoad;
            bitmap.EndInit();
            return bitmap;
        }

previewImage.Source = null;

if (System.IO.File.Exists(WebCamControl.globalFilePath))
                {
                    System.IO.File.Delete(WebCamControl.globalFilePath);
                }
                else
                {
                    MessageBox.Show("File Not Exists");
                }

After Completing this process when i take the new image the Image control shows the previous image which was deleted. Is the Image Control caching the previus Image??Kindly give me the solution.