how solve this problam
Data binding directly to a store query (DbSet, DbQuery, DbSqlQuery) is not supported. Instead populate a DbSet with data, for example by calling Load on the DbSet, and then bind to local data. For WPF bind to DbSet.Local. For WinForms bind to DbSet.Local.ToBindingList().
protected void Page_Load(object sender, EventArgs e)
{
testEntities MyDB = new testEntities();
GridView1.DataSource = from P in MyDB.T2
select new { P.age, P.id, P.number };
GridView1.DataBind();
}