ASP.NET code for filling and displaying a DataGrid

need code for asp.net web application in VB to fill the datagrid with dataset and display it fetched from database
i have done a project in asp.net web application which needs to display datagrid that contains the data fetched from the database. and the most important thing it(the datagrid) should be refreshed without clicking on the refresh button.i tried to do this by using timer and calling a method which fills the datagrid with dataset in windows application and run it successfully.but i failed to do the same in asp.net web application....please help me in acheiving this...