Do not bind Datagridview after udating datatable

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DataGridView

Hi everybody,

I bind datagridview using datatable when I want to update the datarow of datatable. I done process then try to bind datatable to datagrid only updated row will be show another rows are remved from grid. at the same time i check datatable data then there are rows availabe more than one wht is problem can anybdy explain it

code is like this:

dt_row = dt.NewRow();
dt_row[3] =(txt_rate.Text).ToString();
dt_row[4] = purchase_orderNo;
dt_row[5] == Convert.ToDouble(txt_quantity.Text) * convert.ToDouble(txt_rate.Text);
dt.Rows.Add(dt_row);
dt.AcceptChanges();
GoodsGrid.DataSource = null;
GoodsGrid.DataSource = dt;
GoodsGrid.DataBind();

thanks in advance