LINQ to SQL:如何在连接表时处理不明确的列名？

var query = from t1 in context.Table1
            join t2 in context.Table2
            on t1.Column1 equals t2.Column1
            select new
            {
                Column1 = t1.Column1,
                Column2 = t1.Column2,
                Column3 = t2.Column3
            };

var query = from t1 in context.Table1
            join t2 in context.Table2
            on t1.Column1 equals t2.Column1
            join t3 in context.Table3
            on t1.Column2 equals t3.Column2
            select new
            {
                Column1 = t1.Column1,
                Column2 = t1.Column2,
                Column3 = t2.Column3,
                Column4 = t3.Column4
            };