how to retrieve images from sql to asp page?

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ASP.NET4

Dear sir;

i have problem to retrieving image from sql.when i click on the search button the text will be displayed in the text field but image is crashed (i want to show image in image box but does not display). please help me as soon as possible.
thanks in advance
for further detail please see my code.

protected void btnselect_Click(object sender, EventArgs e)
        {
            string table_naame = drp_table.SelectedItem.Text.ToString();
            string number = txtno.Text;
            try
            {
                if (con.State == ConnectionState.Closed)
                {
                    con.Open();
                }
                string query = "Select headlines,detail,ImagePath From " + @table_naame + " Where ID=" + @number + "";
                com = new SqlCommand(query, con);
                SqlDataAdapter da = new SqlDataAdapter(com);
                DataTable dt = new DataTable();
                da.Fill(dt);
                txtheaadline.Text = dt.Rows[0]["headlines"].ToString();
                txtdetail.Text = dt.Rows[0]["Detail"].ToString();
                ImageDisplay.ImageUrl = dt.Rows[0]["ImagePath"].ToString();
 }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                if (con.State == ConnectionState.Open)
                {
                    con.Close();
                }
            }