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ASP.NET using Entity Framework display data to drop down list with distinct [closed]

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Please I need to implement distinct in a.CompanyName but it doesn't work. What do I need to do ?
try
{
var listCompany = company.CompanyList();
companyList1.DataSource = listCompany.Select(a => new { a.CompanyName, a.CompanyId }).Distinct();
companyList1.DataTextField = "CompanyName";
companyList1.DataValueField = "CompanyId";
companyList1.DataBind();
}
catch (Exception)
{
throw;
}

You can use with .GroupBy()
Groups the elements of a sequence.
companyList1.DataSource = listCompany
.GroupBy(x => x.CompanyName)
.Select(a => new
{ CompanyName = a.First().CompanyName, CompanyId = a.First().CompanyId });
Above query will group your result by company name and then will select CompanyName and CompanyId of first record
Try out online

Convert SQL query into linq C# [closed]

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Convert SQL query to LINQ C#
SELECT ts.TeacherId, count(Distinct ts.SubjectId) as Subjects
from dbo.TeacherSubjects ts
GROUP BY ts.TeacherId
HAVING ts.TeacherId = 2352
here is my LINQ query
var SubjectsGroup = db.TeacherSubjects.Where(p => p.TeacherId == 2352).Distinct().GroupBy(x => x.TeacherId);

var teacherId = ; // your teacherId here
var result = new {
TeacherId = teacherId,
Subjects = db.TeacherSubjects.Where(ts => ts.TeacherId == teacherId).Select(x => x.SubjectId).Distinct().Count()
};
Or you can group by SubjectId:
var teacherId = ; // put your teacherId here
var result =
(from ts in TeacherSubjects.Where(x => x.TeacherId == teacherId)
group ts by ts.SubjectId into gr
select new
{
TeacherId = teacherId,
Subjects = gr.Count()
}).ToList();

How to write the below SQL query to LINQ query in C#? [closed]

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How to convert normal SQL to LINQ query? Is there tools that can do that?? Online Tools

Have you tried something like this (a few joins omitted for brevity):
var result = from s in TooltipsLanguage
join c in TooltipsLanguageSection on s.Id equals c.IdLanguage
join p in TooltipsSection on c.IdSection equals p.Id
join ...
select new MyDestinationObject()
{
Id = s.BusinessEntityID,
Language = s.Language,
IdLanguage = c.IdLanguage,
...
};

This meight be help you.
var temp= edbContext.TooltipsLanguage.select(
c=> new {
TooltipsLanguage.Id,
TooltipsLanguage.Language,
TooltipsLanguage.TooltipsLanguageSection.Id,
TooltipsLanguage.TooltipsLanguageSection.IdLanguage,
TooltipsLanguage.TooltipsLanguageSection.IdSection,
TooltipsLanguage.TooltipsLanguageSection.TooltipsSection.Id,
TooltipsLanguage.TooltipsLanguageSection.TooltipsSection.Section,
TooltipsLanguage.TooltipsLanguageSection.TooltipsSection.Section.TooltipsItem.Id,
TooltipsLanguage.TooltipsLanguageSection.TooltipsSection.Section.TooltipsItem.IdItem,
TooltipsLanguage.TooltipsLanguageSection.TooltipsSection.Section.TooltipsItem.TooltipsItemText.Id,
TooltipsLanguage.TooltipsLanguageSection.TooltipsSection.Section.TooltipsItem.TooltipsItemText.IdItem,
TooltipsLanguage.TooltipsLanguageSection.TooltipsSection.Section.TooltipsItem.TooltipsItemText.IdText,
TooltipsLanguage.TooltipsLanguageSection.TooltipsSection.Section.TooltipsItem.TooltipsItemText.TooltipsText.Id,
TooltipsLanguage.TooltipsLanguageSection.TooltipsSection.Section.TooltipsItem.TooltipsItemText.TooltipsText.Texts});

how to sort date in c# [closed]

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I have many date in one variable like:
var date = hfAllDates.Value.Split('#');
there are four date(01/01/2016,22/01/2016,18/01/2016,05/01/2016) in date variable .
how to sort date.
Thanks

add namespace using System.Linq;
and use LINQ Query
in ascending order
var orderedDateList = date.OrderBy(x => DateTime.Parse(x)).ToList();
in Descending oreder
var orderedDateList = date.OrderByDescending(x => DateTime.Parse(x)).ToList();

Convert date from string[] to List<DateTime> first:
List<DateTime> dtList = date.Select(x => DateTime.Parse(x)).ToList();
Then you can easily sort it:
dtList.Sort();

Using Linq's OrderBy:
var sortedDates = date.OrderBy(x => DateTime.Parse(x));
or
var sortedDates = date.OrderByDescending(x => DateTime.Parse(x));
if you are needed to sort dates descending

I suggest using Linq:
var date = hfAllDates.Value.Split('#')
.Select(line => DateTime.Parse(x))
.OrderBy(x => x)
.ToList();

linq convert query syntax to method syntax [closed]

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How can I convert this query syntax to method syntax in linq:
return (from x in db.Table1
join y in db.Table1 on x.ID equals y.ID - 1
where Convert.ToInt32(y.ID) >= Convert.ToInt32(x.ID)
orderby x.Name
select x).Distinct();
Which approach is better? I like this query approach better but I was asked to work with method syntax which looks too bloated to me.

var results = db.Table1.Join
(
db.Table1,
x=>x.ID,
x=>x.ID - 1,
(x,y)=>new{OuterTable = x, xid = x.ID, yid = y.ID}
)
.Where(x=>Convert.ToInt32(x.yid ) >= Convert.ToInt32(x.xid))
.Select(x=>x.OuterTable)
.OrderBy(x=>x.Name)
.Distinct();