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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();

Updating fields in one list from another list [closed]

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Is there a better or more efficient way to do this?
Both of these objects have the same Id and some similar fields that I want to update.
foreach (var i in oldItems)
{
foreach (var j in newItemValues)
{
if(i.id == j.Id)
{
j.field1 = (decimal)i.field1;
j.field2 = (decimal)i.field2;
}
}
}

try this maybe you are like this;
foreach (var n in newItemValues)
{
Item item = oldItems.FirstOrDefault(x => x.Id == n.Id);
if (item != null)
{
n.field1 = item.field1;
n.field2 = item.field2;
}
}
Edit: If you keep oldItems in a HashSet or HashTable by keeping key as Id the time taken will slow to O(N).

Convert oldItems or newItemValues into a Map before looping.
That will reduce computational complexity from O(n^2) to O(n)

You can do this by Linq Query
newItemsValues =
(from t1 in oldItems
join t2 in newItemsValues on t1.Id equals t2.Id
select new YourModel { field1 = t1.field1 ,field2 = t1.field2 }
).ToList();
result will a list of all matching items where oldItems Id will be equals to newItemsValues Id

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});

dynamic list in C# [closed]

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if(some condition)
{
var columnSeries = (from l in logs
group l by l.MonitoringPorfileName into grp
select new
{
type = "column",
name = grp.Key,
data = (from h in Hours
let gd = grp.Where(x => x.Hours == h)
select gd.Sum(x => x.Count)).ToArray()
}).ToList();
}
}
How can i make this variable columnSeries a global variable? i have searched a lot on this, found list dynamic> new{}; but none of them are working so help will be really appreciated

Make the anonymous type you want a class.
public class ColumnSeries
{
public string type {get; set;}
//...
}
//class level variable
IEnumerable<ColumnSeries> columnSeries = null;
//then create the ColumnSeries list
columnSeries = (from l in logs
group l by l.MonitoringPorfileName into grp
select new ColumnSeries
{
type = "column",
name = grp.Key,
data = (from h in Hours
let gd = grp.Where(x => x.Hours == h)
select gd.Sum(x => x.Count)).ToArray()
});

You are creating an anonymous type inside your if statment but you want to use the result ouside the scope of the if statement. Usually you just define 'columnSeries' before the if BUT this is an anonymous type so it's not obvous.
So, before the if statement do the following (untested but should be close):
var columnSeries = Enumerable.Repeat(new {type="", name="", data=new int[]{0}}, 0);
Check out this question for more info