public void mtdCargarRol() { DataSet dsRol = new DataSet(); dsRol = miServicioW.mtdListarRol(); int C = dsRol.Tables["tblDatos"].Rows.Count; cmbRol.DataSource = dsRol.Tables["tblDatos"]; cmbRol.DataTextField = "Rol"; cmbRol.DataValueField = "IdRol"; cmbRol.DataBind(); }