Ways to append to GridView

Question

I have a webapp that goes and makes some webgets and returns the results in Gridview. Sometimes, the app may need to make 400+ webgets, but only populate the grid with 15-20 records.

Is there a way to partially load a GridView, so that each record is appended to the existing GridView?

Adding Code

    List<Test> testList = new List<Test>();
    foreach (Location str in list)
        {
            string url;
            try
            {
                url = "http://www.test.com/" + str.Url;

                XmlReader reader = XmlReader.Create(url);

                Rss10FeedFormatter formatter = new Rss10FeedFormatter();
                if (formatter.CanRead(reader))
                {
                    formatter.ReadFrom(reader);
                    IEnumerable<SyndicationItem> items = formatter.Feed.Items;

                    int itemCt = 1;
                    foreach (SyndicationItem item in items)
                    {
                            Test test = new Test();
                            test.Name = item.Name;
                            test.City= item.City;

                            testList.Add(data);


                            //if I add this here, the RowDatabound does not fire, if I take out, it works fine but only after all requests are made
                            listGrid.DataSource = temp;
                            listGrid.DataBind();


                    }
                }
                else
                    throw new ApplicationException("Invalid RSS 1.0 feed at " + FeedUrl.Text.Trim());
            }

Answer 1

Create a separate list that you will DataBind the gridview to, and then whenever you change the elements in that list just rebind the gridview.

var mySmallerList = bigList.Skip(someNumber).Take(someOtherNumber);
myGridView.DataSource = mySmallerList;