how do i? update datagrid in a web application?

i just started a crash course in c# web applicaitons
is it possible to use stored procedures in c#.net web applications?

and i have a problem updating the datagrid on a wep app
im using VS 2003 frontend
and access 2003 backend


the problem line is
"string key = DataGrid1.DataKeys[e.Item.ItemIndex].ToString();"
the error is
"Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index "

im still a novice in programming especially c#
so if you could help me understand this i would be much appreciative

:ehh:

Code:

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                private void DataGrid1_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
                {string sc;
                        sc = "SELECT tblTasks.strTask, tblTasks.memInstructions, tblTasks.dtmDuedate, tblTasks.strContact, tblTasks.strLocation FROM tblTasks";
                        DataSet ds = new DataSet();
                        System.Data.OleDb.OleDbConnection odc = new OleDbConnection("Provider=Microsoft.JET.OLEDB.4.0;data source=Tasks.mdb");                       
                        System.Data.OleDb.OleDbDataAdapter da = new OleDbDataAdapter(sc, odc);
                        System.Data.OleDb.OleDbCommandBuilder cb = new OleDbCommandBuilder();
                        DataGrid1.DataSource = ds.Tables["tblTasks"];


//       
//                       
                       
                        string strTask, memInstructions, dtmDuedate, strContact, strLocation;
                        string key = DataGrid1.DataKeys[e.Item.ItemIndex].ToString();
                        TextBox tb;
                        tb = (TextBox)(e.Item.Cells[2].Controls[0]);
                        strTask = tb.Text;
                        tb = (TextBox)(e.Item.Cells[3].Controls[0]);
                        memInstructions = tb.Text;
                        tb = (TextBox)(e.Item.Cells[4].Controls[0]);
                        dtmDuedate = tb.Text;
                        tb = (TextBox)(e.Item.Cells[5].Controls[0]);
                        strContact = tb.Text;
                        tb = (TextBox)(e.Item.Cells[6].Controls[0]);
                        strLocation = tb.Text;
                        da.Update(ds, "tblTasks");
                        DataGrid1.EditItemIndex = -1;
                        DataGrid1.DataBind();


                }

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