元データ作成

GenerateSource.cs

var q = from i in Enumerable.Range(1, 100)
        from j in Enumerable.Range(1, 100)
        from k in Enumerable.Range(1, 10)
        select new Sales
        {
          Customer = string.Format("取引先{0:d2}", i),
          Product = string.Format("商品{0:d2}", j),
          UnitPrice = Convert.ToDecimal(j * 100),
          Quantity = k
        };
var source = q.ToArray();