ADO.NET Obj:

SqlConnection
SQlcommand
SqlDataReader
SqlDataAdapter
Dataset


Retrieving Data:

SqlConnection con = new SqlConnection("");
con.Open();
SqlCommand cmd = new SqlCommand("select * from Tbl", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();