gridview, doesn't show me the image instead of showing me a text "System.Byte[]"

<p style="margin-left: 160px">
            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
                DataKeyNames="inum" DataSourceID="SqlDataSource1" CellPadding="4"
                ForeColor="#333333" GridLines="None">
                <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
                <Columns>
                    <asp:BoundField DataField="inum" HeaderText="inum" InsertVisible="False" ReadOnly="True"
                        SortExpression="inum" />
                    <asp:BoundField DataField="iname" HeaderText="iname" SortExpression="iname" />
                    <asp:TemplateField HeaderText="image">
                    <ItemTemplate>

<asp:image ID="image1" runat="server"
ImageUrl='<%# "Handler.ashx?inum=" + Eval("inum")%>'/>
</ItemTemplate>
</asp:TemplateField>

                </Columns>
                <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
                <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
                <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
                <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
                <EditRowStyle BackColor="#999999" />
                <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
            </asp:GridView>

            <asp:SqlDataSource ID="SqlDataSource1" runat="server"
                ConnectionString="<%$ ConnectionStrings:SomeDataBase1 %>"
                SelectCommand="SELECT inum, iname, image FROM ft"
                ConflictDetection="CompareAllValues"
                DeleteCommand="DELETE FROM [ft] WHERE [inum] = @original_inum AND (([iname] = @original_iname) OR ([iname] IS NULL AND @original_iname IS NULL)) AND (([image] = @original_image) OR ([image] IS NULL AND @original_image IS NULL))"
                InsertCommand="INSERT INTO [ft] ([inum], [iname], [image]) VALUES (@inum, @iname, @image)"
                OldValuesParameterFormatString="original_{0}"
                UpdateCommand="UPDATE [ft] SET [iname] = @iname, [image] = @image WHERE [inum] = @original_inum AND (([iname] = @original_iname) OR ([iname] IS NULL AND @original_iname IS NULL)) AND (([image] = @original_image) OR ([image] IS NULL AND @original_image IS NULL))">
                <DeleteParameters>
                    <asp:Parameter Name="original_inum" Type="String" />
                    <asp:Parameter Name="original_iname" Type="String" />
                    <asp:Parameter Name="original_image" Type="Object" />
                </DeleteParameters>
                <UpdateParameters>
                    <asp:Parameter Name="iname" Type="String" />
                    <asp:Parameter Name="image" Type="Object" />
                    <asp:Parameter Name="original_inum" Type="String" />
                    <asp:Parameter Name="original_iname" Type="String" />
                    <asp:Parameter Name="original_image" Type="Object" />
                </UpdateParameters>
                <InsertParameters>
                    <asp:Parameter Name="inum" Type="String" />
                    <asp:Parameter Name="iname" Type="String" />
                    <asp:Parameter Name="image" Type="Object" />
                </InsertParameters>
            </asp:SqlDataSource>

protected void Page_Load(object sender, EventArgs e)
       {
           SqlConnection con = new SqlConnection();
           string constr = ConfigurationManager.ConnectionStrings["SomeDataBase1"].ToString();
           con = new SqlConnection(constr);
           SqlCommand cmd = new SqlCommand();
           con.Open();

               GridView1.DataBind();
               con.Close();

       }