protected void Page_Load(object sender, EventArgs e) { acceso = new accesoDatosSQL(); acceso.conectar(); if (!Page.IsPostBack) { DataSet ds = acceso.asignaturasAlumno((String)Session.Contents["email"]); DropDownList1.DataSource = ds.Tables[0]; DropDownList1.DataTextField = "codigoasig"; DropDownList1.DataBind(); DataView view_tareas = acceso.genericasAlumno((String)Session.Contents["email"]); view_tareas.RowFilter = "codAsig=" + "'" + DropDownList1.SelectedValue + "'"; GridView1.DataSource = view_tareas; GridView1.DataBind(); } }