CREATE DATABASE MyFileArchive
ON PRIMARY
(NAME = MyFileArchive_data,
FILENAME = 'C:\Demo\MyFileArchive_data.mdf'),
FILEGROUP FileStreamGroup CONTAINS FILESTREAM
(NAME = PhotoFileLibrary_blobs,
FILENAME = 'C:\Demo\MyFiles')
LOG ON
(NAME = PhotoFileLibrary_log,
FILENAME = 'C:\Demo\MyFileArchive_log.ldf')
WITH FILESTREAM
(DIRECTORY_NAME='FilesLibrary',
NON_TRANSACTED_ACCESS=FULL)

public class Product
{
        public Product(string name)
        {
            Name = name;
        }
        public string Name { get; set; }
        public string Screen { get; set; }
        public string OS { get; set; }
        public override string ToString()
        {
            return string.Format(Screen + "/" + OS + "/" + Name);
        }
}

public class CustomArrayList<T>
{
    private T[] arr;
    private int count;
 
    public int Count
    {
        get
        {
            return this.count;
        }
    }
 
    private const int INITIAL_CAPACITY = 4;
 
    public CustomArrayList(int capacity = INITIAL_CAPACITY)
    {
        this.arr = new T[capacity];
        this.count = 0;
    }

public void Add(T item)
{
    GrowIfArrIsFull();
    this.arr[this.count] = item;
    this.count++;
} 

public void Insert(int index, T item)
{
    if (index > this.count || index < 0)
    {
        throw new IndexOutOfRangeException(
            "Invalid index: " + index);
    }
    GrowIfArrIsFull();
    Array.Copy(this.arr, index,
        this.arr, index + 1, this.count - index);
    this.arr[index] = item;
    this.count++;
} 

private void GrowIfArrIsFull()
{
    if (this.count + 1 > this.arr.Length)
    {
        T[] extendedArr = new T[this.arr.Length * 2];
        Array.Copy(this.arr, extendedArr, this.count);
        this.arr = extendedArr;
    }
}
 
public void Clear()
{
    this.arr = new T[INITIAL_CAPACITY];
    this.count = 0;
}

public class DynamicList<T>
{
    private class ListNode
    {
        public T Element { get; set; }
        public ListNode NextNode { get; set; }
 
        public ListNode(T element)
        {
            this.Element = element;
            NextNode = null;
        }
 
        public ListNode(T element, ListNode prevNode)
        {
            this.Element = element;
            prevNode.NextNode = this;
        }
    }
 
    private ListNode head;
    private ListNode tail;
    private int count;
 
    // …
}

public DynamicList()
{
    this.head = null;
    this.tail = null;
    this.count = 0;
}

public void Add(T item)
{
    if (this.head == null)
    {
        this.head = new ListNode(item);
        this.tail = this.head;
    }
    else
    {
        ListNode newNode = new ListNode(item, this.tail);
        this.tail = newNode;
    }
    this.count++;
}

public T RemoveAt(int index)
{
    if (index >= count || index < 0)
    {
        throw new ArgumentOutOfRangeException(
            "Invalid index: " + index);
    }
 
    int currentIndex = 0;
    ListNode currentNode = this.head;
    ListNode prevNode = null;
    while (currentIndex < index)
    {
        prevNode = currentNode;
        currentNode = currentNode.NextNode;
        currentIndex++;
    }
 

    RemoveListNode(currentNode, prevNode);
 
    return currentNode.Element;
}

private void RemoveListNode(ListNode node, ListNode prevNode)
{
    count--;
    if (count == 0)
    {
        this.head = null;
        this.tail = null;
    }
    else if (prevNode == null)
    {
        this.head = node.NextNode;
    }
    else
    {
        prevNode.NextNode = node.NextNode;
    }

    if (object.ReferenceEquals(this.tail, node))
    {
        this.tail = prevNode;
    }
}

OVER ( 
       [ <PARTITION BY clause> ]
       [ <ORDER BY clause> ] 
       [ <ROW or RANGE clause> ]
      )

<PARTITION BY clause> ::=
PARTITION BY value_expression , ... [ n ]

<ORDER BY clause> ::=
ORDER BY order_by_expression
    [ COLLATE collation_name ] 
    [ ASC | DESC ] 
    [ ,...n ]

<ROW or RANGE clause> ::=
{ ROWS | RANGE } <window frame extent>

<window frame extent> ::= 
{   <window frame preceding>
  | <window frame between>
}

<window frame between> ::= 
  BETWEEN <window frame bound> AND <window frame bound>

<window frame bound> ::= 
{   <window frame preceding>
  | <window frame following>
}

<window frame preceding> ::= 
{
    UNBOUNDED PRECEDING
  | <unsigned_value_specification> PRECEDING
  | CURRENT ROW
}

<window frame following> ::= 
{
    UNBOUNDED FOLLOWING
  | <unsigned_value_specification> FOLLOWING
  | CURRENT ROW
}

<unsigned value specification> ::= 
{  <unsigned integer literal> }

CREATE TABLE REVENUE
(
[DepartmentID] int,
[Revenue] int,
[Year] int
);
 
insert into REVENUE
values (1,10030,1998),(2,20000,1998),(3,40000,1998),
 (1,20000,1999),(2,60000,1999),(3,50000,1999),
 (1,40000,2000),(2,40000,2000),(3,60000,2000),
 (1,30000,2001),(2,30000,2001),(3,70000,2001)
 

 select *,
 avg(Revenue) OVER (PARTITION by DepartmentID) as AverageRevenue,
 sum(Revenue) OVER (PARTITION by DepartmentID) as TotalRevenue
from REVENUE
order by departmentID, year;

 insert into REVENUE
 values(1,90000,2002),(2,20000,2002),(3,80000,2002),
 (1,10300,2003),(2,1000,2003), (3,90000,2003),
 (1,10000,2004),(2,10000,2004),(3,10000,2004),
 (1,20000,2005),(2,20000,2005),(3,20000,2005),
 (1,40000,2006),(2,30000,2006),(3,30000,2006),
 (1,70000,2007),(2,40000,2007),(3,40000,2007),
 (1,50000,2008),(2,50000,2008),(3,50000,2008),
 (1,20000,2009),(2,60000,2009),(3,60000,2009),
 (1,30000,2010),(2,70000,2010),(3,70000,2010),
 (1,80000,2011),(2,80000,2011),(3,80000,2011),
 (1,10000,2012),(2,90000,2012),(3,90000,2012)

select Year, DepartmentID, Revenue,
sum(Revenue) OVER (PARTITION by DepartmentID ORDER BY [YEAR]
             ROWS BETWEEN 3 PRECEDING AND CURRENT ROW) as Prev3
From REVENUE order by departmentID, year;

ROWS BETWEEN 3 PRECEDING AND CURRENT ROW) as Prev3

select Year, DepartmentID, Revenue,
 sum(Revenue) OVER (PARTITION by DepartmentID ORDER BY [YEAR]
              ROWS BETWEEN CURRENT ROW AND 3 FOLLOWING) as Next3
From REVENUE order by departmentID, year;

select Year, DepartmentID, Revenue,
       min(Revenue) OVER (PARTITION by DepartmentID ORDER BY [YEAR]
                    ROWS UNBOUNDED PRECEDING) as MinRevenueToDate
From REVENUE order by departmentID, year;

RANGE UNBOUNDED PRECEDING AND CURRENT ROW 

CREATE TABLE Employees (  
    EmployeeId INT IDENTITY PRIMARY KEY,  
    Name VARCHAR(50),  
    HireDate DATE NOT NULL,  
    Salary INT NOT NULL  
)  
GO  
INSERT INTO Employees (Name, HireDate, Salary)  
VALUES   
    ('Alice', '2011-01-01', 20000),  
    ('Brent', '2011-01-15', 19000),  
    ('Carlos', '2011-02-01', 22000),  
    ('Donna', '2011-03-01', 25000),  
    ('Evan', '2011-04-01', 18500)  
GO  

SELECT  
    Name,   
    Salary,   
    AVG(Salary) OVER(ORDER BY HireDate) AS avgSalary  
FROM Employees  
GO 

SELECT  
    Name,   
    Salary,   
    AVG(Salary) OVER(ORDER BY HireDate 
                 RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS avgSalary  
FROM Employees  
GO

SELECT  
    Name,   
    Salary,   
    AVG(Salary) OVER(ORDER BY HireDate   
                        RANGE   
                        BETWEEN UNBOUNDED PRECEDING   
                        AND UNBOUNDED FOLLOWING  
                    ) AS avgSalary  
FROM Employees  
GO  

m.Groups["text"].Value

 private static readonly Regex regex_tags = new Regex("<.*?>", RegexOptions.Compiled);
 private  string CleanScriptTags(string html)
        {
            return regex_tags.Replace(html, string.Empty);
        }

 PersianReshape reshaper = new PersianReshape();
                 text = reshaper.reshape(text);
                 string[] splitedlines = text.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
                 text = "";
                 foreach (string line in splitedlines)
                 {
                     //3.reverse tags
                     text += ReverseText(reshaper.reshape(line))+Environment.NewLine ;
                 }

Dictionary<int ,int>  letters=new Dictionary<int, int>();

   //0=0x0 ,1=1x0 ,2=0x1 ,3=1x1
        private void FillPrimaryTable()
        {
            //آ
            letters.Add(1570, 65153);
            //ا
            letters.Add(1575, 65166);
            //أ
            letters.Add(1571, 65155);
            //ب
            letters.Add(1576, 65167);
            //ت
            letters.Add(1578, 65173);
            //ث
            letters.Add(1579, 65177);
            //ج
            letters.Add(1580, 65181);
.....
}

Dictionary<int,byte> specialchars=new Dictionary<int, byte>();

  private void SetSpecialChars()
        {
            //آ
            specialchars.Add(1570, 0);
            //ا
            specialchars.Add(1575, 0);
            //د2
            specialchars.Add(1583, 1);
            //ذ2
            specialchars.Add(1584, 1);
            //ر2
            specialchars.Add(1585, 1);
            //ز2
            specialchars.Add(1586, 1);
            //ژ
            specialchars.Add(1688, 1);
            //و2
            specialchars.Add(1608, 1);
            //أ
            specialchars.Add(1571, 1);

        }

  PersianReshape reshaper = new PersianReshape();
                 text = reshaper.reshape(text);

 //3.reverse tags
                 text = ReverseText(text);

string[] splitedlines = text.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
                 text = "";
                 foreach (string line in splitedlines)
                 {
                     //3.reverse tags
                     text += ReverseText(reshaper.reshape(line))+Environment.NewLine ;
                 }

    private string Reverse(string text)
        {
            return Reverse(text,0,text.Length);
        }

        private string Reverse(string text,int start,int end)
        {
            if (end < start)
                return text;
            string reverseText = "";

            for (int i = end-1; i >=start; i--)
            {
                reverseText += text[i];
            }
            return reverseText;
        }

  private string ReverseText(string text)
        {
            char[] chararray = text.ToCharArray();
            string reverseText = "";
            bool prefixcomp = false;
            bool postfixcomp = false;
            string prefix = "";
            string postfix = "";

            #region get prefix symbols
            for (int i = 0; i < chararray.Length; i++)
            {
                if (!prefixcomp)
                {
                    char ch =(char) chararray.GetValue(i) ;
                    if (ch< 130)
                    {
                        prefix += chararray.GetValue(i);
                    }
                    else
                    {
                        prefixcomp = true;
                        break;
                    }
                }
            }
            #endregion
}

 #region get postfix symbols
            for (int i = chararray.Length - 1; i >-1 ; i--)
            {
                if (!postfixcomp && prefix.Length!=text.Length)
                {
                    char ch = (char)chararray.GetValue(i);
                    if (ch < 130)
                    {
                        postfix += chararray.GetValue(i);
                    }
                    else
                    {
                        postfixcomp = true;
                        break;
                    }
                }
            }
            #endregion

  #region reverse text

            reverseText = Reverse(text, prefix.Length, text.Length-postfix.Length);

        
            reverseText = unTagetdLettersRegex.Replace(reverseText, delegate(Match m)
            {
                return Reverse(m.Value);
            });
            #endregion

private static readonly Regex unTagetdLettersRegex = new Regex(@"[A-Za-z0-9]+", RegexOptions.Compiled);

return prefix+ reverseText+postfix;

private static readonly Regex unTagetdLettersRegex = new Regex(@"[A-Za-z0-9]+", RegexOptions.Compiled);
private string ReverseText(string text)
        {
            char[] chararray = text.ToCharArray();
            string reverseText = "";
            bool prefixcomp = false;
            bool postfixcomp = false;
            string prefix = "";
            string postfix = "";

            #region get prefix symbols
            for (int i = 0; i < chararray.Length; i++)
            {
                if (!prefixcomp)
                {
                    char ch =(char) chararray.GetValue(i) ;
                    if (ch< 130)
                    {
                        prefix += chararray.GetValue(i);
                    }
                    else
                    {
                        prefixcomp = true;
                        break;
                    }
                }
            }
            #endregion

            #region get postfix symbols
            for (int i = chararray.Length - 1; i >-1 ; i--)
            {
                if (!postfixcomp && prefix.Length!=text.Length)
                {
                    char ch = (char)chararray.GetValue(i);
                    if (ch < 130)
                    {
                        postfix += chararray.GetValue(i);
                    }
                    else
                    {
                        postfixcomp = true;
                        break;
                    }
                }
            }
            #endregion

            #region reverse text

            reverseText = Reverse(text, prefix.Length, text.Length-postfix.Length);

        
            reverseText = unTagetdLettersRegex.Replace(reverseText, delegate(Match m)
            {
                return Reverse(m.Value);
            });
            #endregion

          

            return prefix+ reverseText+postfix;
        }

return
                     string.Format("{0}\r\n{1} --> {2}\r\n", m.Groups["sequence"], m.Groups["start"].Value,
                         m.Groups["end"]) + text + Environment.NewLine+Environment.NewLine ;

//1.remove tags
                 text = CleanScriptTags(text);

  text =StringUtils.ConvertToMultiLine(text);

namespace Utils
{
    public static class StringUtils
    {
        public static string ConvertToMultiLine(String text, int min = 30, int max = 40)
        {
            if (text.Trim() == "")
                return text;

            string[] words = text.Split(new string[] { " " }, StringSplitOptions.None);

            string text1 = "";
            string text2 = "";
            foreach (string w in words)
            {
                if (text1.Length < min)
                {
                    if (text1.Length == 0)
                    {
                        text1 = w;
                        continue;
                    }

                    if (w.Length + text1.Length <= max)
                        text1 += " " + w;
                }
                else
                    text2 += w + " ";

            }
            text1 = text1.Trim();
            text2 = text2.Trim();
            if (text2.Length > 0)
            {
                text1 += Environment.NewLine + ConvertToMultiLine(text2, min, max);
            }
            return text1;
        }
      
    }
}