public void AddRange() { DataRelationCollection drcol = _dataset.Relations; DataRelation dr1 = new DataRelation("CustOrder" , _dataset.Tables["Customer"].Columns["custid"] , _dataset.Tables["Order"].Columns["custid"]); DataRelation dr2 = new DataRelation("ItemOrder" , _dataset.Tables["Item"].Columns["itemid"] , _dataset.Tables["Order"].Columns["custid"]); drcol.AddRange(new DataRelation[] { dr1, dr2 }); Assert.Equal("CustOrder", drcol[0].RelationName); Assert.Equal("ItemOrder", drcol[1].RelationName); }