.net 3.5 - insert multipes rows in one request c# -


in visual studio 2008 create smart device net 3.5, please want insert 5000 in 1 request ,for example "insert group_user select 1,5 union select 2,5 ..." dosent work ,i tried directly in sqlmanagment ready inserted exception (le nombre de valeurs dans la liste de sélection de sous-requête est insuffisant. insert many values ) , sorry english :( please need !

public string addgroupuser(list<groupuser> listgroupuser)         {             string concatenation = "";             (int = 0; < listgroupuser.count; i++)              {                  int nbreenreg = listgroupuser.count;                 int idgroup = listgroupuser[i].group_id;                 int iduser = listgroupuser[i].user_id;                 int dernierelement = nbreenreg - 1;                if (i == dernierelement)                 {                     concatenation += " select " + iduser + " ," + idgroup + "  ";                  }                  else                 {                     concatenation += " select " + iduser + " ," + idgroup + " union  ";                 }             }             string requete = "insert group_user  " + concatenation;              return requete;         } internal static int executeupdaten(string requête,sqlceconnection conne)         {             // on gère les éventuelles exceptions             try             {                  // exécute sqlcommand avec requête de mise à jour                  sqlcecommand sqlcommand = new sqlcecommand(requête, conne);                  int nblignes = sqlcommand.executenonquery();                    return nblignes;              }             catch (exception e)             {                  return -1;             }                         {                 connexion.getinstance().closeconnection();             }         }  executeupdaten(requete);


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