gridview rowupdating using parametrized query.

[wajans]

Hi I have gridview and I am using gridview1_rowupdating event to update the gridview, but when I am using the code given below its not working. I do not know why it is not updating, it is not even showing error. please help me resolve this problem. Thanks

protected void gv_RowUpdating1(object sender, GridViewUpdateEventArgs e)
{
connectAccessDb();
int i = e.RowIndex;
//par = cmd.Parameters;
//cmd.Parameters.Clear();
string id = (gv.Rows[e.RowIndex].FindControl("lblCID") as Label).Text;
string comp = (gv.Rows[e.RowIndex].FindControl("txtCName") as TextBox).Text;
string address = (gv.Rows[e.RowIndex].FindControl("txtCAddr") as TextBox).Text;
string city = (gv.Rows[e.RowIndex].FindControl("txtCcity") as TextBox).Text;
//string strQuery="UPDATE companydetail SET companyname='" + comp + "',companyaddress='" + address + "',companycity='" + city + "' where id=" + Convert.ToInt32(id);
//dCmd = new OleDbCommand(strQuery, cn);
//dCmd = new OleDbCommand("UPDATE companydetail SET companyname=@comp, companyaddress=@address, companycity=@city where id=@id", cn);
string strQuery = "UPDATE companydetail SET companyname=@comp, companyaddress=@address, companycity=@city where id=@id";
cmd = new OleDbCommand(strQuery, cn);
cmd.Parameters.Add("@id", OleDbType.Integer).Value = Convert.ToInt32(id);
cmd.Parameters.Add("@comp", OleDbType.VarChar).Value = comp;
cmd.Parameters.Add("@address", OleDbType.VarChar).Value = address;
cmd.Parameters.Add("@city", OleDbType.VarChar).Value = city;

    cmd.ExecuteNonQuery();
    cmd.ExecuteNonQuery();
    //gv.EditIndex = -1;
    cn.Close();
    bindData();

  
}

private void bindData()
{
connectAccessDb();
da = new OleDbDataAdapter("SELECT id,companyname,companyaddress,companycity from companydetail order by companyname", cn);
da.Fill(ds, "companydetail");
gv.DataSource = ds;
gv.DataBind();
cn.Close();
}
private void connectAccessDb()
{

    cn = new OleDbConnection("provider=microsoft.jet.oledb.4.0;data source=" + strRootDir + "App\_Data\\\\newsdb.mdb");
    cn.Open();
}