I have a page currently setup to upload 1 image at a time, it uploaded the image, then creates a thumbnail for that image in the same directory. Client needs / wants to be able to upload a few more images at the same time. So i would like to see if i can use the existing code that works, but setup to upload a few more images and process them all to create the thumbnails.

I currently have a page that allows them to upload 5 images at a time and that works fine, but its just simple uploading the images, nothing else is happening at that moment.

Here is the code i am working with:

    protected void UploadBtn_Click(Object sender, EventArgs e)
    {
        String pth = Server.MapPath("~/gallery/homebirth/images/");
        

        String UploadedFile = MyFile.PostedFile.FileName;
        int ExtractPos = UploadedFile.LastIndexOf("/") + 1;


        //to retrieve only Filename from the complete path
        String UploadedFileName = UploadedFile.Substring(ExtractPos, UploadedFile.Length - ExtractPos);




        // Display information about posted file. Div is invisible by default
        FileName.InnerHtml = UploadedFileName;
        MyContentType.InnerHtml = MyFile.PostedFile.ContentType;
        ContentLength.InnerHtml = MyFile.PostedFile.ContentLength.ToString();


        //div is made visible
        FileDetails.Visible = true;
        // Save uploaded file to server at the in the Pics folder
        MyFile.PostedFile.SaveAs(pth + UploadedFileName);


        //thumbnail creation starts
        try
        {
            //Read in the image filename whose thumbnail has to be created
            String imageUrl = UploadedFileName;


            //You may even specify a standard thumbnail size
            int imageWidth = 120;
            int imageHeight = 120;


            if (imageUrl.IndexOf("/") >= 0 || imageUrl.IndexOf("\\") >= 0)
            {
                Response.End();
            }


            //the uploaded image will be stored in the Pics folder. to get resize the image, the original image has to be accessed from the Pics folder
            imageUrl = pth + imageUrl;


            System.Drawing.Image fullSizeImg = System.Drawing.Image.FromFile(imageUrl);


            System.Drawing.Image.GetThumbnailImageAbort dummyCallBack = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);


            System.Drawing.Image thumbNailImg = fullSizeImg.GetThumbnailImage(imageWidth, imageHeight, dummyCallBack, IntPtr.Zero);


            //We need to create a unique filename for each generated image
            DateTime MyDate = DateTime.Now;


            String MyString = MyDate.ToString("ddMMyyhhmmss") + ".png";


            //Save the thumbnail in Png format. You may change it to a diff format with the ImageFormat property
            thumbNailImg.Save(pth + MyString, ImageFormat.Png);


            thumbNailImg.Dispose();


            //Display the original & the newly generated thumbnail
            Image1.AlternateText = "Original image";
            Image1.ImageUrl = @"~/gallery/homebirth/images/" + UploadedFileName;


            Image2.AlternateText = "Thumbnail";
            Image2.ImageUrl = @"~/gallery/homebirth/images/" + MyString;
        }


        catch (Exception ex)
        {
            Response.Write("An error occurred - " + ex.ToString());
        }


    }