image is not uploading

public void BindGridData()

        {
            string username=(string)(Session["UserAuthentication"]);
            SqlConnection con = new SqlConnection(connstring);
            SqlCommand cmd = new SqlCommand("SELECT imgname from [Image] WHERE imgname='" + username + "'", con);
            SqlDataReader sdr;
            con.Open();
            sdr = cmd.ExecuteReader();
            while (sdr.Read())
            {
                Image1.ImageUrl = sdr[0].ToString();
            }
            con.Close();
        }
protected void Button2_Click1(object sender, EventArgs e)
        {

if (FileUpload1.HasFile)
{

int length = FileUpload1.PostedFile.ContentLength;

byte[] imgbyte = new byte[length];

HttpPostedFile img = FileUpload1.PostedFile;

img.InputStream.Read(imgbyte, 0, length);
string username=(string)(Session["UserAuthentication"]);

SqlConnection connection = new SqlConnection(connstring);
connection.Open();
SqlCommand cmd = new SqlCommand("INSERT INTO Image (imgname,Image) VALUES (@imgname,@imagedata)", connection);
cmd.Parameters.Add("@imgname", SqlDbType.VarChar, 50).Value = username;
cmd.Parameters.Add("@imagedata", SqlDbType.Image).Value = imgbyte;
int count = cmd.ExecuteNonQuery();
connection.Close();
if (count == 1)
{
BindGridData();

ScriptManager.RegisterStartupScript(this, this.GetType(), "alertmessage", "javascript:alert('" + username + " image inserted successfully')", true);
}
}
 public class ImageHandler : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            
            string imageid = context.Request.QueryString["ID"];
            SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\VAS\Desktop\Orignal Project Part 1\Inventory Management System\IMS.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True");
            conn.Open();
            SqlCommand command = new SqlCommand("select Image from Image where imgname=" + imageid, conn);
            SqlDataReader dr = command.ExecuteReader();
            dr.Read();
            context.Response.BinaryWrite((Byte[])dr[0]);
            conn.Close();
            context.Response.End();
}

<asp:Image ID="Image1" runat="server" ImageUrl='<%# "ImageHandler.ashx?ID="+ Eval("imagename") %>'  Height="267px" 
          Width="768px" />