System.Data.Tests.DataRelationCollectionTest.AddException2 C# (CSharp) Метод

        public void AddException2()
        {
            Assert.Throws<ArgumentException>(() =>
           {
               DataRelationCollection drcol = _dataset.Relations;
               DataRelation dr1 = new DataRelation("CustOrder"
                               , _dataset.Tables["Customer"].Columns["custid"]
                               , _dataset.Tables["Order"].Columns["custid"]);
               drcol.Add(dr1);
               drcol.Add(dr1);
           });
        }