image saving format and retrieving in asp.net,..?

if (dt.Rows.Count > 0)
       {
           lblPrice.Text = dt.Rows[0]["Price"].ToString();
           ImageUrl.ImageUrl = dt.Rows[0]["ImageUrl"].ToString();
       }

<asp:Image ID="ImageUrl" runat="server" ImageUrl='<%#Eval("ImageUrl") %>'></asp:Image>

protected void Button1_Click(object sender, EventArgs e)
   {
        string Price = "";
        Image ImageUrl = "";//is this in correct format
   }

Price = lblPrice.Text;
ImageUrl = ImageUrl;//how to write code here//

SqlParameter paraImageUrl = new SqlParameter("@ImageUrl", SqlDbType.VarChar,50);
paraImageUrl.Value = ImageUrl;
cmd.Parameters.Add(paraImageUrl);