System.Data.Tests.DataRelationCollectionTest.AddException3 C# (CSharp) Method

        public void AddException3()
        {
            Assert.Throws<DuplicateNameException>(() =>
           {
               DataRelationCollection drcol = _dataset.Relations;
               DataRelation dr1 = new DataRelation("DuplicateName"
                               , _dataset.Tables["Customer"].Columns["custid"]
                               , _dataset.Tables["Order"].Columns["custid"]);
               DataRelation dr2 = new DataRelation("DuplicateName"
                               , _dataset.Tables["Item"].Columns["itemid"]
                               , _dataset.Tables["Order"].Columns["custid"]);

               drcol.Add(dr1);
               drcol.Add(dr2);
           });
        }