Bind Image in Runtime Button Click event in Panel

protected void Button1_Click(object sender, EventArgs e)
{
    //if (FileUpload1.HasFile)
    //{
    //    string fileName = FileUpload1.FileName;
    //    FileUpload1.PostedFile.SaveAs(Server.MapPath("~/Images/") + fileName);
    //}
    LoadImages();
//    Response.Redirect("~/TestApp.aspx");
}

private void LoadImages()
{
    string filepath = @"C:\Documents and Settings\All Users\Documents\My Pictures\Sample Pictures\";
  //  string filepath = "~/Images";
    string[] fileEntries = Directory.GetFiles(filepath, TextBox1.Text + "*.jpg", SearchOption.TopDirectoryOnly);
    foreach (string filename in fileEntries)
    {
        ImageButton imagebutton = new ImageButton();
        FileInfo fi = new FileInfo(filename);
        imagebutton.ImageUrl = filepath + fi.Name;
        imagebutton.AlternateText = fi.Name;
        imagebutton.Height = Unit.Pixel(100);
        imagebutton.Style.Add("padding", "5px");
        imagebutton.Width = Unit.Pixel(100);
        imagebutton.Click += new ImageClickEventHandler(imageButton_Click);
        imagebutton.Visible = true;
        this.Controls.Add(imagebutton);

        Panel1.Controls.Add(imagebutton);
    }

    //foreach (string strfile in Directory.GetFiles(Server.MapPath("~/Images")))
    //{
    //    ImageButton imageButton = new ImageButton();
    //    FileInfo fi = new FileInfo(strfile);
    //    imageButton.ImageUrl = "~/Images/" + fi.Name;
    //    imageButton.Height = Unit.Pixel(100);
    //    imageButton.Style.Add("padding", "5px");
    //    imageButton.Width = Unit.Pixel(100);
    //    imageButton.Click += new ImageClickEventHandler(imageButton_Click);
    //    Panel1.Controls.Add(imageButton);
    //}
}

protected void imageButton_Click(object sender, ImageClickEventArgs e)
{
    Response.Redirect("WebForm1.aspx?ImageURL=" + ((ImageButton)sender).ImageUrl);
}

<form id="form1" runat="server">
    <div>

        <%--<asp:Label ID="Label1" runat="server" Text="FileNames"></asp:Label>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:LinkButton ID="LinkButton1" runat="server">LinkButton</asp:LinkButton>--%>
        <%--<asp:FileUpload ID="FileUpload1" runat="server" />--%>
        <asp:TextBox ID="TextBox1" runat="server" />
<asp:Button ID="imagebutton_Click" runat="server" Text="Upload" OnClick="Button1_Click" />
<asp:Panel ID="Panel1" runat="server" Width="440px"
    BorderStyle="Dotted" BorderColor="#000066">
    </asp:Panel>
    </div>
    </form>