C# Program to Produce a filtered sequence of elements that contain only one property of each Student

This C# Program to Produce a filtered sequence of elements that contain only one property of each Student using Select Clause LINQ. Here select clause specifies the type of values that will be produced when the query is executed.

Here is source code of the C# Program to Produce a filtered sequence of elements that contain only one property of each Student.The C# program is successfully compiled and executed with Microsoft Visual Studio. The program output is also shown below.

```
/*
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 *  C# Program to Produce a filtered sequence of elements that contain only one property of each Student

```
 */
```
```
using System;
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```
using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
```
```
class Programs
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```
{
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```
    public class Student
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```
    {
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        public string First { get; set; }

        public string Last { get; set; }

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        public int ID { get; set; }
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        public List<int> Marks;
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        public ContactInfo GetContactInfo(Programs pg, int id)

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        {
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            ContactInfo allinfo =
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                (from ci in pg.contactList

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                 where ci.ID == id
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                 select ci)
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                .FirstOrDefault();
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```
 
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            return allinfo;
```
```
        }
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```
 
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        public override string ToString()

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        {
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            return First + "" + Last + " :  " + ID;

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        }
```
```
    }
```
```
 
```
```
    public class ContactInfo
```
```
    {
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```
        public int ID { get; set; }
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        public string Email { get; set; }

        public string Phone { get; set; }

        public override string ToString() { return Email + "," + Phone; }

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    }
```
```
 
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    public class ScoreInfo
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    {
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        public double Average { get; set; }

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        public int ID { get; set; }
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    }
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    List<Student> students = new List<Student>()

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        {
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             new Student {First="Tom", Last=".S", ID=1, Marks= new List<int>() {97, 92, 81, 60}},

             new Student {First="Jerry", Last=".M", ID=2, Marks= new List<int>() {75, 84, 91, 39}},

             new Student {First="Bob", Last=".P", ID=3, Marks= new List<int>() {88, 94, 65, 91}},

             new Student {First="Mark", Last=".G", ID=4, Marks= new List<int>() {97, 89, 85, 82}},

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        };
```

    List<ContactInfo> contactList = new List<ContactInfo>()

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        {
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            new ContactInfo {ID=111, Email="[email protected]", Phone="9328298765"},

            new ContactInfo {ID=112, Email="[email protected]", Phone="9876543201"},

            new ContactInfo {ID=113, Email="[email protected]", Phone="9087467653"},

            new ContactInfo {ID=114, Email="[email protected]", Phone="9870098761"}

```
        };
```
```
 
```
```
 
```
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    static void Main(string[] args)
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```
    {
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        Programs pg = new Programs();
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        IEnumerable<String> studentQuery2 =

                from student in pg.students

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                where student.ID > 1
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                select student.Last;
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```
 
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        Console.WriteLine("\r\n studentQuery2: select range_variable.Property");

        foreach (string s in studentQuery2)

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        {
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            Console.WriteLine(s);
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        }
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```
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        Console.ReadLine();
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    }
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```
}
```

Here is the output of the C# Program:

 studentQuery2: select range_variable.Property
.M
.P
.G

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