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How to compare date in linq c#

i have 'created date' and 'closed date' in my file and i'm converting it in json so i have that dates in json.
in my method i have two parameter like from date and to date and i want to count particular column data of my file between from date and to date.so how can we write code to fetch it using linq.
i tried this...
public JsonResult StatusDerails(DateTime from,DateTime to)
{
string csvurl = WebConfigurationManager.AppSettings["csvfileurl"];
var lines = System.IO.File.ReadAllLines(csvurl).Skip(1);
List<Product> prdt = new List<Product>();
foreach (string line in lines)
{
Product c1 = new Product();
var split = line.Split(',');
c1.ID = Int32.Parse(split[0]);
c1.Area_Path = split[1];
c1.IterationPath = split[2];
c1.State = split[3];
c1.Reason = split[4];
c1.Priority = Int32.Parse(split[5]);
c1.Severity = split[6];
c1.Tags = split[7];
c1.Title = split[8];
c1.CreatedDate = split[9];
c1.CreatedBy = split[10];
c1.ResolvedDate = split[11];
c1.ResolvedBy = split[12];
c1.ClosedDate = split[13];
c1.AssignedTo = split[14];
prdt.Add(c1);
}
//var list = prdt.GroupBy(a=>a.AreaPath).Select(a=>new UIproduct() {
var productName = prdt.Select(a => a.Area_Path).Distinct();
List<StatusDetail> statusdetail = new List<StatusDetail>();
foreach (var Name in productName)
{
StatusDetail sd = new StatusDetail();
sd.CarryOver = prdt.Where(a => a.CreatedDate >= from.Date.ToString() && a.ClosedDate <= to.Date.ToShortDateString
}
return Json(statusdetail, JsonRequestBehavior.AllowGet);
}

The comparison of DateTime as string will not be a good option and that wont gives you the exact result, So I recommend you to change the type of CreatedDate and ClosedDate to DateTime. and compare two DateTime values in linq. I think instead of splitting json for creating object of certain types you can use json converters.
Fix for your scenario:
c1.CreatedDate = DateTime.Parse(split[9]);
c1.ClosedDate = DateTime.Parse(split[13]);
Don't forget to change the type in the class, Now its fine to use the linq as like the following:
sd.CarryOver = prdt.Where(a => a.CreatedDate >= from.Date && a.ClosedDate <= to.Date);

C# separating data within a line from a text file

I have a data file
Name; LastName; EurosCents;
Name2; LastName2; EurosCents2;
(for example:
John; Smith; 4,20;
Josh; Peck; 6,50;
)
I need to read the data and then do some further work with it... Is there any way to read the lines and save them? As the only way to read from a text file is to read the entire line at once.

var lst = File.ReadAllLines(yourFilePath).Select(x => new
{
FirstName = x.Split(';')[0]
LastName = x.Split(';')[1]
Value = decimal.Parse(x.Split(';')[2])
}).ToList();
use
lst[7].FirstName = "xxx";
Console.WriteLine(lst[2].Value);
etc...

The File API provide multiple options for reading files. Below is a possible way to proceed:
foreach(var line in File.ReadAllLines(path))
{
var splitted = line.Split(';');
var name = splitted.ElementAtOrDefault(0);
var lastName = splitted.ElementAtOrDefault(1);
var cents = Decimal.Parse(splitted.ElementAtOrDefault(2));
}

Parsing will be very easy if you are comfortable using LINQ.
Below line can get you the file in a hierarchical structure.
var theselines = File.ReadLines(#"C:\Test.txt").Select(l => l.Split(','));
You can see the result of above line by debugging.
Later you can have any logic to get the required data from each line without using foreach loop.
var Data = theselines.Select(l => new
{
id = l.Where(t => t.Contains("01")).FirstOrDefault(),
Price = l.Where(t => t.Contains(",")).FirstOrDefault(),
Firstname= l[0],
lastname = l[1]
});

Providing that data itself (both names and cents) can't contain ; in order to get
items from the comma separated values you can just split:
var data = File
.ReadLines(#"C:\MyData.csv")
// .Skip(1) // <- in case you have caption to skip
.Select(line => line.Split(';'))
.Select(items => new {
Name = items[0],
LastName = items[1],
EuroCents = decimal.Parse(items[2]) //TODO: check type and its format
});
//.ToArray(); // <- if you want to materialize as, say, an array
Then you can use it
foreach (var item in data) {
if (item.EuroCents > 10) {
...
}
}

the simple code to read whole file is as follows
string[] test(string path)
{
System.IO.StreamReader sr = new System.IO.StreamReader(path);
string[] str = sr.ReadToEnd().Split(';');
sr.Close();
return str;
}

Make a method that returns csv file in C#

I've made a method that's doing some csv file creation. For testing purpose I was saving file on file system, but I don't want to do it like this.
This is my code:
void ICreateNewCsv.CreateCsvForIndividuals(List<FormattedPerson> formattedPersons)
{
//var CsvFilePath = "C:\\temp\\individuals.csv";
var csv = new StringBuilder();
var toExclude = new HashSet<string>
{
"ID",
"SubSystemID",
"System",
"Component"
};
var props = typeof (FormattedPerson).GetProperties(BindingFlags.Public | BindingFlags.Instance).
Where(property => !toExclude.Contains(property.Name));
var header = string.Join(", ", props.Select(p => p.Name.ToString()).ToArray());
csv.AppendLine(header);
for (var i = 0; i < formattedPersons.Count; i++)
{
var personTexts = formattedPersons
.Select(p => string.Join(",", p.Surname, p.FirstName, p.MiddleName, p.DateOfBirth,
p.NationalID, p.Gender, p.Address1, p.Address2, p.Address3,
p.City, p.Country, p.PostalCode, p.UniqueID));
var joined = string.Join(Environment.NewLine, personTexts);
csv.AppendLine(joined);
}
//File.AppendAllText(CsvFilePath, csv.ToString());
}
Is there a way to return csv file instead of just having void method?

I would suggest to replace void with FileStream,
then you will return a 'System.IO.FileStream' Object that can have the Type of everything (.CSV but also Text or anything else).
Than you would just have to Parse/Use it the way you'd like in the part where you call the Method:
FileStream objFile = ICreateNewCsv.CreateCsvForIndividuals(formattedPersons);

line number while querying with linq

I am using a stream reader to read a text file and then using Linq for retrieving the information
String fileContent = prodFileStreamReader.ReadToEnd();
var mydata = from con in fileContent.Split('$').Select(x => x.Trim())
where !String.IsNullOrEmpty(con)
select new BaseSegment
{
dataID = con.Substring(0, con.IndexOf('#')),
dataElms = con.Split('#').ToArray(),
dataCon = con,
lineNumber =
};
I would also like to get the line number. I tried using Index but I was not able to. How to query to get the index and assign it to lineNumber?

Try using the select that projects index into each item, as given in this msdn article: http://msdn.microsoft.com/en-us/library/bb534869.aspx
In your case something like this (not tested):
var mydata = fileContent.Split('$')
.Select(x => x.Trim())
.Where(con => !String.IsNullOrEmpty(con))
.Select((con, index) => new
{
dataID = con.Substring(0, con.IndexOf('#')),
dataElms = con.Split('#').ToArray(),
dataCon = con,
lineNumber = index
});

For starters, I would not read the file in as a big string. Use methods that could process it in small chunks. Use File.ReadLines() for example to read through the file line by line. It will be easier to get line numbers this way and much more efficient than reading it all at once only to split it up again.
const string filePath = ...;
var myData =
from pair in File.ReadLines(filePath)
.Select((LineNumber, Line) => new { LineNumber, Line })
where ...
select new BaseSegment
{
...
Line = pair.Line,
LineNumber = pair.LineNumber,
};
p.s., You should stick to the usual C# naming conventions. Public properties of your classes should use PascalCasing, not camelCasing and should not be abbreviated.
The code you use to process the content looks awkward. It could probably be improved if I knew what the files looked like. I'll leave that out until you could show us how it is.

How about this?
var animalList = from a in animals
select new { Animal = a, Index = animals.IndexOf(a) };
or in your case...
Index = fileContent.IndexOf(con)

if this whole data is going in myData then you can use the index directly from the myData.

Try This:
String fileContent = prodFileStreamReader.ReadToEnd();
var mydata = from con in fileContent.Split('$').Select(x => x.Trim())
where !String.IsNullOrEmpty(con)
select new BaseSegment
{
dataID = con.Substring(0, con.IndexOf('#')),
dataElms = con.Split('#').ToArray(),
dataCon = con,
lineNumber = Array.IndexOf(fileContent.Split('$').Select(x => x.Trim(),con)
};
Array.IndexOf(yourArrey,the string you looking for); -> will return the index in the arrey.

you can try something like this
long index = 0;
var xElementsAndNodes = from xmlElement in elementsColl
select new
{
Index = index += 1,
....
}

How to create LINQ QUERY dynamically?

Is there any way to insert part of the code between { } dynamically?
LINQ QUERY:
var csvdata = from csvline in csvlines
let column = csvline.Split(';')
select new {
produkt = column[0],
cislo = column[1],
part = column[2],
serial = column[3]
};
I mean something like:
string qpart = "produkt = column[0], cislo = column[1], part = column[2], serial = column[3]";
var csvdata = from csvline in csvlines
let column = csvline.Split(';')
select new {
qpart
};
Thanks for answers..

Try investigating Dynamic Linq Query Library.
http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx
http://naspinski.net/post/Writing-Dynamic-Linq-Queries-in-Linq-to-Entities.aspx
You'll need to convert the string array returned from Split into IQueryable for it to work but I think this is your best shot.
var results = columns
.Select("new(column[0] As produkt)");
Is how I'd I imagine it would work?.