Editable datagrid

[rcoco]

Hi,
I'm working on a asp.net project with a datagrid. I want the user to
be adding data into Sql database using the datagrid. So I'm using a
ListBox to do this and edit update and delete. I placed listbox in
EditItemTemplate and label in ItemTemplate. but when I try now to edit
it does not bring the lisbox but i can read the grid with the sql
content. my code actually looks like this:

public void Edit_dgid(object source,
System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
dgid.EditItemIndex = e.Item.ItemIndex;
BindDataGrid();
}

public void Cancel_dgid(object source,
System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
dgid.EditItemIndex = -1;
BindDataGrid();
}

public void Update_dgid(object source,
System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
System.Web.UI.WebControls.ListBox st=new
System.Web.UI.WebControls.ListBox();
st=(System.Web.UI.WebControls.ListBox)e.Item.Cells[5].FindControl("lbachobj");
System.Web.UI.WebControls.ListBox st1=new
System.Web.UI.WebControls.ListBox();
st=(System.Web.UI.WebControls.ListBox)e.Item.Cells[4].FindControl("lbobj");
SqlCommand myCommand=new SqlCommand();
myCommand.Connection=con;
myCommand.CommandText="insert into Object,AchievedObject where
@Object,@AchievedObject";
myCommand.Parameters.Add(new
SqlParameter("@AchievedObject",SqlDbType.Text));
myCommand.Parameters["@AchievedObject"].Value=st.SelectedValue;
myCommand.Parameters.Add(new SqlParameter("@Object",SqlDbType.Text));
myCommand.Parameters["@Object"].Value=st1.SelectedValue;
con.Open();
myCommand.ExecuteNonQuery();
con.Close();
dgid.EditItemIndex=-1;
BindDataGrid();
}

Thanks.