i am getting problem in image slideshow the uploaded image getting blank

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ASP.NET

actually iam working with image slide show what i want is

actually iam uploading images using fileuploadcontrol when iam uploading its uploading but when iam making image slide show there the problem occurs

I have three fields id,name,img when i insert images with the same name as image name the image is sliding for ex my img name is ram.jpg if ienter the name in txtname as ram.jpg the image is sliding but if i put the txtname as ram no image coming"
so below is code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public partial class sldeshow : System.Web.UI.Page
{
    static DataTable dt;
    static int TotalRecords, CurrentRecord;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {

            string sqlconstr = "Data Source=HOME;Initial Catalog=Registration;Integrated Security=True";
            SqlConnection con = new SqlConnection(sqlconstr);
            SqlDataAdapter sqlda = new SqlDataAdapter("select * from imagepath where CurrentDate is NULL union ALL select * from imagepath where convert(varchar(20), CurrentDate, 101) = convert(varchar(20), getdate(), 101)", con);
            dt = new DataTable();
            sqlda.Fill(dt);
            TotalRecords = dt.Rows.Count;
            Image1.ImageUrl = "~/Upload/" + dt.Rows[0]["ImageName"].ToString();

        }
    }
    protected void Timer11_Tick(object sender, EventArgs e)
    {
        CurrentRecord++;
        if (CurrentRecord == TotalRecords)
        {
            CurrentRecord = 0;
        }
        Image1.ImageUrl = "~/Upload/" + dt.Rows[CurrentRecord]["ImageName"].ToString();
    }