c# i'm not editing my collection,but the program show me InvalidOperationException error -

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i don't understand why code not work.

 foreach (datarow dr in dtr.rows)         {             = new kustom.metier.authentification.utilisateur(convert.toint32(dr[0]), dr[1].tostring().trim(), dr[2].tostring().trim(), convert.toboolean(dr[3]), _droitdal.getdroits(convert.toint32(dr[0])));             list.add(a);         }


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