error in handling the image...

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C#

MY TABLE IS
UserId
ImageName varchar(500)

pictures is the folder

i also set ImageField=ImageName

mycode is

 string sImageFileExtension;
    SqlConnection conn=new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\omar\Documents\Visual Studio 2005\WebSites\Project2\App_Data\Database.mdf;Integrated Security=True;User Instance=True");
    DataBaseClass dbClass = new DataBaseClass();
    public DataTable dt;
    string connstr=@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\omar\Documents\Visual Studio 2005\WebSites\Project2\App_Data\Database.mdf;Integrated Security=True;User Instance=True";
    protected void Page_Load(object sender, EventArgs e)
    {
   
        Load_GridData();
    }


void Load_GridData()
    {
        conn.Open();
        SqlDataAdapter Sqa = new SqlDataAdapter("select * from Pictures Where UserId=('"+Session["Id"].ToString()+"')", conn);
        DataSet ds = new DataSet();
        Sqa.Fill(ds);   // fill the dataset 
        GridView1.DataSource = ds; // give data to GridView
        GridView1.DataBind();
        conn.Close();
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileUpload1.PostedFile != null)
        {
            string myMap = MapPath("~/");
            Random r = new Random();
            int next = r.Next();
            string ImageName = FileUpload1.PostedFile.FileName;
            sImageFileExtension = ImageName.Substring(ImageName.LastIndexOf(".")).ToLower();
            if (sImageFileExtension == ".gif" || sImageFileExtension == ".png" || sImageFileExtension == ".jpg" || sImageFileExtension == ".jpeg" || sImageFileExtension == ".bmp")
            {
                string ImageSaveURL = myMap + "Pictures/" +next+ sImageFileExtension;
                try
                {
                    FileUpload1.PostedFile.SaveAs(ImageSaveURL);
                    //  Session["Id"]=dt.Rows[0]["Id"].ToString();
                    string RegisterQuery = "insert into Pictures(UserId,ImageName)values('" + Session["Id"].ToString()+ "','"+next+sImageFileExtension+"')";
                    dbClass.ConnectDataBaseToInsert(RegisterQuery);
                    Response.Redirect("~/Default3.aspx");
                }
    catch (Exception ex)
                {
                }
            }
            else
            {
            }
        }
    }
}

Image is not displayed in gridview in databound field cross is displayed