Imagebutton not working inside datalist while linkbutton is working

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C#

ASP.NET

Hi All!!!

i have an image button inside my datalist. i have given it a command name and a command argument. i am calling it on datalistItemCommand. it is not working. when i replaced the image button with linkbutton it started working.I tried using checkpoint but when i am using imagebutton it's not firing itemcommand event. Please tell me ho i can i made my image button work. i really need image button here not the link button.

<asp:DataList ID="DataList1" runat="server" RepeatColumns="4"
              onitemcommand="DataList1_ItemCommand" >
      <ItemTemplate>
        <obout:ImageZoom ID="ImageZoom1" runat="server"  ImageUrl='<%#Eval("ImageUrl") %>'/>
      <br />
      <asp:Label ID="Label1" runat="server" Text='<%#Eval("ProductName") %>'></asp:Label>
      <br />
      <asp:Label ID="Label2" runat="server" Text='<%#Eval("ProductCost") %>'></asp:Label>
     <br />
           <asp:ImageButton ID="Button1"  runat="server" Text="Add to Cart" CommandName="ADD"  CommandArgument='<%#Eval("ProductID") %>' ImageUrl="~/img/button_add_to_cart.png"/>

     <br />
      </ItemTemplate>
      </asp:DataList>

here is the itemcommand event

protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
    {
        try
        {
            if (e.CommandName == "ADD")
            {
                arg = e.CommandArgument.ToString();
                con.Open();
                SqlCommand cmd1 = new SqlCommand("Select ProductID , ProductName ,ProductCost from Products where ProductID= '" + arg + "'", con);
                SqlDataReader dr;
                dr = cmd1.ExecuteReader();
                dr.Read();
                DataTable MyDT = new DataTable();
                DataRow MyRow;
                if (Session["DataTable"] == null)
                {
                    MyDT.Columns.Add("ProductId", System.Type.GetType("System.String"));
                    MyDT.Columns.Add("ProductName");
                    MyDT.Columns.Add("UnitPrice", System.Type.GetType("System.Decimal"));
                    MyRow = MyDT.NewRow();
                    MyRow[0] = dr.GetValue(0).ToString();
                    MyRow[1] = dr.GetValue(1).ToString();
                    MyRow[2] = dr.GetValue(2).ToString();
                    MyDT.Rows.Add(MyRow);
                }
                else
                {
                    MyDT = (DataTable)Session ["DataTable"];
                    MyRow = MyDT.NewRow();
                    MyRow[0] = dr.GetValue(0).ToString();
                    MyRow[1] = dr.GetValue(1).ToString();
                    MyRow[2] = dr.GetValue(2).ToString();
                    MyDT.Rows.Add(MyRow);

                }

                Session["DataTable"] = MyDT;
                GridView1.DataSource = MyDT;
                GridView1.DataBind();
                con.Close();
            }
        }
        catch (Exception ex)
        {
            Session.Abandon();
            Session.Clear();
            Response.Write(ex.Message);

        }
    }