Question

I am getting distinct Company Name through this query

 List<string> listCieId = new List<string>(from l in LstAdvancePaymentRep select l.CieDesc.Trim()).Distinct().ToList();

What i want to do is get the Minimum Dated Maximum Date for all the companies in listCieId

   List<DateTime> listCieId2 = new List<DateTime>(from l in LstAdvancePaymentRep where l.CieDesc.Trim().Distinct() select l.CtcDtStart.Value).Min().ToList();

List<DateTime> listCieId3 = new List<DateTime>(from l in LstAdvancePaymentRep where l.CieDesc.Trim().Distinct select l.CtcDtEnd.Value).Max().ToList();

I am new to such queries haven’t used them before

EDIT: I am using Distinct to get a the distinct company names as there is a repetition in the LstAdvancePaymentRep

EDIT: Tried this out

 List<DateTime> lstDatesCtcStartDate = new List<DateTime>(
 from l in LstAdvancePaymentRep where l.CieDesc.Trim().Equals(lblCieName.Text.Trim()) select l.CtcDtStart.Value.Date
 );

How do i find the minimum date in the LIST lstDatesCtcStartDate

Answer 1

Try:

var minDate = lstDatesCtcStartDate.Min();

Or, if your company object had a Name and a Date property and there where multiple of each company and you wanted a list of each distinct company with the smallest date then:

class Company
{
    public string Name { get; set; }
    public DateTime Date { get; set; }
}

var companies = new List<Company>();

var companiesWithMinDate = companies.GroupBy(c => c.Name).Select(g => new { Name = g.Key, Date = g.Min(c => c.Date) });