actually i want to get data for updaion in edit mode how i can data from text control when row in edit mode and click the update button

there is code through which i m trying bu t this code give me data which is in cell not in test box place over cell in edit mode

public void UpdateGridRecord()
    {
        string firstname;
        string lastname;
        string city;
        string pid;
        //pid=Convert.ToInt32(gvPerson.Rows[RowToChange].Cells[1].Text);
        //pid = gvPerson.Rows[RowToChange].Cells[1].Text;
        //firstname = Convert.ChangeType(gvPerson.Rows[RowToChange].Cells[2].Controls[0], TextBox).ToString();
        //lastname=gvPerson.Rows[RowToChange].Cells[3].Text;
        //city=gvPerson.Rows[RowToChange].Cells[4].Text;
        if (Convert.ChangeType(gvPerson.Rows[RowToChange].Cells[2].Controls[0], typeof(TextBox)) != null)
        {
            firstname = ((TextBox)gvPerson.Rows[RowToChange].Cells[2].Controls[0]).Text;
        }
        if (Convert.ChangeType(gvPerson.Rows[RowToChange].Cells[3].Controls[0], typeof(TextBox)) != null)
        {
            lastname = ((TextBox) Convert.ChangeType(gvPerson.Rows[RowToChange].Cells[3].Controls[0],typeof(TextBox))).Text;
        }
        if (Convert.ChangeType(gvPerson.Rows[RowToChange].Cells[4].Controls[0], typeof(TextBox)) != null)
        {
            city = ((TextBox)gvPerson.Rows[RowToChange].Cells[4].Controls[0]).Text;
        }

        //txtChildName = CType(grdchildgrid.Rows(intRowId).Cells(3).Control s(0), TextBox).Text

        DSPerson.UpdateParameters["personid"].DefaultValue = pid;
        DSPerson.UpdateParameters["firstname"].DefaultValue = firstname;
        DSPerson.UpdateParameters["lastname"].DefaultValue = lastname;
        DSPerson.UpdateParameters["city"].DefaultValue = city;
        DSPerson.Update();
    }

please help me

make sure that data binding to grid is done ones.Might be Whenever u 'r are editing the grid page is posted back and control is populated with new data from db loosing what u've typed.

Bijgupt