protected void Page_Init(Object sender, EventArgs e)
        {
        }


        protected void Page_Load(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(Request.Form["ResetButton"]))
            {
                ResetGame();
                if(TempRandomImages.Count!=0)
                {
                    RandomImages = TempRandomImages;
                }

            }

            if (!Page.IsPostBack)
            {
                Image imgObject = new Image();
                RandomImages = imgObject.TempPopulateImages(NUMBER_OF_IMAGES);

                foreach (var img in RandomImages)
                {
                    CreateImageButton(img.NewImageURL, img.ID);
                }
            }
            else if (NumberOfClicks != NUMBER_OF_IMAGES)
            {
                foreach (var img in RandomImages)
                {
                    CreateImageButton(img.NewImageURL, img.ID);
                }
            }
        }

        protected void Image_Click(object sender, ImageClickEventArgs e)
        {

            ImageButton imgButton = sender as ImageButton;

            if (imgButton != null && string.Compare(imgButton.ImageUrl, Resource.TICK_IMAGE, false) != 0)
            {
                imgButton.ImageUrl = Resource.TICK_IMAGE;
                NumberOfClicks++;
            }
        }


        public void CreateImageButton(string imageUrl, string id)
        {
            var button = new ImageButton();
            button.ImageUrl = imageUrl;
            button.ID = id;
            button.Click += Image_Click;
            CardDiv.Controls.Add(button);

        }


        protected void btnReset_Click(object sender, EventArgs e)
        {
        }

        protected void ResetGame()
        {
            for (int ix = this.Controls.Count - 1; ix >= 0; ix--)
                if (this.Controls[ix] is ImageButton) this.Controls[ix].Dispose();

            RandomImages.Clear();
            NumberOfClicks = 0;
            TempRandomImages.Clear();

            Image imgObject = new Image();
            TempRandomImages = imgObject.TempPopulateImages(NUMBER_OF_IMAGES);
        }
    }
}

<div>

<Button Type="Submit" Name="ResetButton"
        Value="Press Here To Do Stuff Early!" id="btnReset" runat="server"
        onclick="btnReset_Click" Text="Reset" title="Click"/>
            Click</p>

</div>

public int TotalImages { get; set; }
    public static string IMAGE_FOLDER = @"~/Cards/";

    public List<Image> imageList = new List<Image>();

    public List<Image> TempPopulateImages(int numberOfImages)
    {
        System.Random rnd = new System.Random();
        var numbers = Enumerable.Range(1, 52).OrderBy(r => rnd.Next()).ToArray();
        var randomNumbers = numbers.Take(numberOfImages).ToArray();

        foreach (var rndNumber in randomNumbers)
        {
            Image image = new Image();
            image.ID = "timgBtn" + (rndNumber).ToString();/////////////////////
            image.OriginalImageURl = IMAGE_FOLDER + (rndNumber).ToString() + ".gif";
            image.NewImageURL = IMAGE_FOLDER + (rndNumber).ToString() + ".gif";
            image.TotalImages = numberOfImages;

            imageList.Add(image);
        }

        return imageList;
    }
}