DataKeys in Gridview

[Vajrala Narendra]

Hi, all
am working on asp.net, c# 2.0
i want to delete a row from a grid view
for that i take datakeyname inn gris view i wrote coding as

<asp:GridView ID="GridView2" runat="server" Height="72px" Width="776px" AutoGenerateColumns="False" 
                      DataKeyNames="fld_jid" >
----

here fld_jid was field name which i selected in coding and bind it to gridview

and in row deleting event i wrote

int jid = (int)GridView1.DataKeys[e.RowIndex].Value;
        cn.Open();
        cmd = new SqlCommand("delete from tbl_js_savedjobs where fld_jid=" + jid, cn);
        cmd.ExecuteNonQuery();
cn.close();

but am getting error as
Specified cast is not valid.

is this coding was correct or not
please suggest me how to write
its urgent to me

Thanks inadvance

[bharathreddy]

Is fld_jid an int type?.

[Vajrala Narendra]

Is fld_jid an int type?.

yes it was numeric only