problem with show image in gridview

hi 

these are code that i use for reduce image size without streaching image

My problem is when i run website in my gridview doesn't show image it just show image border   but doesn't show my image from database

image.aspx.cs

 protected void Page_Load(object sender, EventArgs e)
    {



        SqlCommand _cmd = new SqlCommand("select image from House_p where behcode=1115", _cn);


        _cn.Open();
        SqlDataReader _dr = _cmd.ExecuteReader();
        if (_dr.HasRows)
        {

            GridView1.DataSource = _dr;
            GridView1.DataBind();
        }
        _cn.Close();





}



public string img_resize(string picname, int maxHeight, int maxWidth)
    {

        System.Drawing.Image currentImage = System.Drawing.Image.FromFile(Server.MapPath("image/house\\") + picname);

        double imgHeight = 0;
        double imgWidth = 0;
        imgHeight = currentImage.Height;
        imgWidth = currentImage.Width;

        if (imgWidth > maxWidth | imgHeight > maxHeight)
        {
            //Determine what dimension is off by more
            double deltaWidth = imgWidth - maxWidth;
            double deltaHeight = imgHeight - maxHeight;
            double scaleFactor = 0;

            if (deltaHeight > deltaWidth)
            {
                //Scale by the height
                scaleFactor = maxHeight / imgHeight;
            }
            else
            {
                //Scale by the Width
                scaleFactor = maxWidth / imgWidth;
            }

            imgWidth *= scaleFactor;
            imgHeight *= scaleFactor;
        }


        string html = null;

if (imgHeight != currentImage.Height | imgWidth != currentImage.Width) {
	html = "<a href=\""  + Path.GetFileName("../image/house") + "\">" + "<img src=\"ShowThumbnail.aspx?img=" + Path.GetFileName("../image/house") + "&w=" + imgWidth + "&h=" + imgHeight + "\" " + "height=\"" + imgHeight + "\" width=\"" + imgWidth + "\" border=1>" + "</a>";
} else {

	html = "<a href=\""+ Path.GetFileName("../image/house") + "\">" + "<img src=\"ShowThumbnail.aspx?img=" + Path.GetFileName("../image/house") + "\" " + "height=\"" + imgHeight + "\" width=\"" + imgWidth + "\" border=1>" + "</a>";

}
return html;

image.aspx

<div>
        <asp:GridView ID="GridView1" runat="server" AllowSorting="true" AutoGenerateColumns="false"  Width="100%" GridLines="None">
        <Columns>
 
        <asp:TemplateField SortExpression="reply_user">
        <ItemTemplate>
        <%#img_resize(Eval("image").ToString(),100,80 )%>
        </ItemTemplate>
        </asp:TemplateField>
        </Columns>
        </asp:GridView>
    </div>
    

ShowThumpnail.aspx

protected void Page_Load(object sender, EventArgs e)
    {


        string imageUrl = Request.QueryString["img"];

        int imageHeight = int.Parse(Request.QueryString["h"]);
        int imageWidth = int.Parse(Request.QueryString["w"]);

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

        imageUrl = "image/house\\" + imageUrl;

        System.Drawing.Image fullSizeImg = null;
        fullSizeImg = System.Drawing.Image.FromFile(Server.MapPath(imageUrl));

        Response.ContentType = "image/jpg";

        if (imageHeight > 0 & imageWidth > 0)
        {
            System.Drawing.Image.GetThumbnailImageAbort dummyCallBack = null;
            dummyCallBack = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);

            System.Drawing.Image thumbNailImg = null;


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


            fullSizeImg.Save(Response.OutputStream, ImageFormat.Gif);
        }
        else
        {
            fullSizeImg.Save(Response.OutputStream, ImageFormat.Gif);
        }

    }

    public bool ThumbnailCallback()
    {
        return false;

    }
}

and my image is in this directoty

image/House