Swapping GridView DataSourceID from DataSource

Here's the simple code for swapping the GridView back to DataSourceID from DataSource:

    protected void DropDownListListsInUser_SelectedIndexChanged(object sender, EventArgs e)
    {
        GridViewStocksInList.DataSource = null;
        GridViewStocksInList.DataSourceID = SqlDataSourceGetStocksInList.ID;
        GridViewStocksInList.DataBind();
    }

The solution came from here.
It suggested studying this.