การ refresh datagridview แก้ไขยังไงดี มันไม่ เปลี่ยนค่าให้สะทีอ่ะครับ

protected void Page_Load(object sender, EventArgs e)
    {
        if (Convert.ToString(Session["login"]) != "live")
        {
            Response.Redirect("login.aspx");
        }

        else
        {
            if (!IsPostBack)
            {
                clsdb db = new clsdb(Convert.ToString(Session["sql"]));
                OleDbConnection dbcon;
                dbcon = db.connectdb();
                dbcon.Open();
                String sql = "select username from account";
                OleDbDataAdapter da;
                System.Data.DataSet dset = new System.Data.DataSet();
                System.Data.DataTable dt;
                da = new System.Data.OleDb.OleDbDataAdapter(sql, dbcon);
                da.Fill(dset);
                dt = dset.Tables[0];

                Label1.Text = (String)dt.Rows[0]["username"];
                bindata();
            }
            else
            {
            }
                //bindata();
        }
    }

protected void bindata()
    {
        OleDbConnection dbcon;

        String sql;

        OleDbDataAdapter da;
        System.Data.DataSet dset = new System.Data.DataSet();
        System.Data.DataTable dt;
        clsdb db = new clsdb(Convert.ToString(Session["sql"]));
        dbcon = db.connectdb();
        dbcon.Open();

        //sql = "select (select count(line_name) from dt_line as a where b.line_name >= a.line_name),b.line_name from dt_line as b Order by b.line_name";
        sql = "select * from dt_line Order by line_name";
        da = new System.Data.OleDb.OleDbDataAdapter(sql, dbcon);
        da.Fill(dset);
        dt = dset.Tables[0];
        if (dt.Rows.Count == 0)
        {
            Label2.Visible = true;
            Label2.Text = "No List Line Name";
        }
        //----------- cell seqance
        gv_line.RowDataBound += new GridViewRowEventHandler(gv_rowdatabound);
        //-----------
        gv_line.DataSource = dset;
        gv_line.DataBind();
        da = null;
        dset = null;
        dt = null;
        db.closedb();
    }

protected void gv_rowdatabound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            e.Row.Cells[0].Text = Convert.ToString(e.Row.RowIndex + (gv_line.PageSize * gv_line.PageIndex) + 1);
        }
    }

    protected void showcom(Object s, GridViewPageEventArgs e)
    {
        gv_line.PageIndex = e.NewPageIndex;
        bindata();
    }
    protected void rowdatabound(Object s, GridViewRowEventArgs e)
    {
        Label Expr1000 = (Label)(e.Row.FindControl("Expr1000"));
        if (Expr1000 != null)
        {
            Expr1000.Text = Convert.ToString(DataBinder.Eval(e.Row.DataItem, "Expr1000"));
        }

        Label line_no = (Label)(e.Row.FindControl("line_no"));
        if (line_no != null)
        {
            line_no.Text = (String)DataBinder.Eval(e.Row.DataItem, "line_no");
        }

        Label line_name = (Label)(e.Row.FindControl("line_name"));
        if (line_name != null)
        {
            line_name.Text = (String)DataBinder.Eval(e.Row.DataItem, "line_name");
        }
    }

protected void commandgv(Object s, GridViewCommandEventArgs e)
    {
        String sql;
        clsdb db = new clsdb(Convert.ToString(Session["sql"]));
        OleDbConnection dbcon;
        dbcon = db.connectdb();
        dbcon.Open();
        if ((String)e.CommandName == "delv")
        {
            sql = "select * from dt_report where line_no = (select line_no from dt_line where line_no ='" + gv_line.DataKeys[Convert.ToInt16(e.CommandArgument)].Value + "')";
            OleDbDataAdapter da = new OleDbDataAdapter(sql, dbcon);
            System.Data.DataSet dset = new System.Data.DataSet();
            da.Fill(dset);

            if (dset.Tables[0].Rows.Count == 0)
            {
                sql = "Delete * from dt_line where line_no = '" + gv_line.DataKeys[Convert.ToInt16(e.CommandArgument)].Value + "'";
                OleDbCommand cmd = new OleDbCommand(sql, dbcon);
                cmd.ExecuteNonQuery();
                cmd.Dispose();
                cmd = null;
                bindata();
                //Response.Redirect("line.aspx");
            }
            else
            {
                L_error_del.Visible = true;
                L_error_del.Font.Size = 10;
                L_error_del.ForeColor = System.Drawing.Color.Red;
                L_error_del.Text = "Line no. : " + gv_line.DataKeys[Convert.ToInt16(e.CommandArgument)].Value +
                                   " is in Report SCAP Job no. ";
                for (int i = 0; i < dset.Tables[0].Rows.Count; i++)
                {
                    if ((i + 1) == dset.Tables[0].Rows.Count)
                    {
                        L_error_del.Text += (String)dset.Tables[0].Rows[i]["job_no"] + " ";
                    }
                    else
                    {
                        L_error_del.Text += (String)dset.Tables[0].Rows[i]["job_no"] + ", ";
                    }
                }
                L_error_del.Text += ".You Should Delete Report SCAP this has the Line no.";
                link_ngreport.Visible = true;
            }
        }
        else if ((String)e.CommandName == "editv")
        {
            Session["value"] = gv_line.DataKeys[Convert.ToInt16(e.CommandArgument)].Value;
            Response.Redirect("edit_line.aspx");
        }
        else
        {
        }
    }