How to convert JSON object to Dictionary in C# ?

	public static Dictionary<string, string> ConvertJsonStr2Dictionary(string jsonStr)
	{
	Dictionary<string, string> dict = new Dictionary<string, string>();
	int start = jsonStr.IndexOf("{", 1) + 2;
	int stop = jsonStr.LastIndexOf("}}");
	jsonStr = jsonStr.Substring(start, stop - start - 1);
	string[] keyValArr = jsonStr.Split(new string[] { "," }, StringSplitOptions.None);
	foreach(string keyVal in keyValArr)
	{
	string key = RemoveLeadingEndingQuotationMarks(keyVal.Substring(0, keyVal.LastIndexOf(":")).Trim());
	string val = RemoveLeadingEndingQuotationMarks(keyVal.Substring(keyVal.LastIndexOf(":") + 1).Trim());
	dict.Add(key, val);
	}
	return dict;
	}

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How to generate bitmap from url in C# ?

	public static Bitmap GenerateScreenshot(string url, int width, int height)
	{
	// Load the webpage into a WebBrowser control
	WebBrowser wb = new WebBrowser();
	wb.ScrollBarsEnabled = false;
	wb.ScriptErrorsSuppressed = true;
	wb.Navigate(url);
	while (wb.ReadyState != WebBrowserReadyState.Complete) { Application.DoEvents(); }
	// Set the size of the WebBrowser control
	wb.Width = width;
	wb.Height = height;
	if (width == -1)
	{
	// Take Screenshot of the web pages full width
	wb.Width = wb.Document.Body.ScrollRectangle.Width;
	}
	if (height == -1)
	{
	// Take Screenshot of the web pages full height
	wb.Height = wb.Document.Body.ScrollRectangle.Height;
	}
	// Get a Bitmap representation of the webpage as it's rendered in the WebBrowser control
	Bitmap bitmap = new Bitmap(wb.Width, wb.Height);
	wb.DrawToBitmap(bitmap, new Rectangle(0, 0, wb.Width, wb.Height));
	wb.Dispose();
	return bitmap;
	}

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How to convert byte array to string and string to byte array in C# ?

	public static byte[] GetByteArrayFromString(string s)
	{
	byte[] bytes = new byte[s.Length * sizeof(char)];
	System.Buffer.BlockCopy(s.ToCharArray(), 0, bytes, 0, bytes.Length);
	return bytes;
	}
	public static string GetStringFromByteArray(byte[] bytesArr)
	{
	char[] chars = new char[bytesArr.Length / sizeof(char)];
	System.Buffer.BlockCopy(bytesArr, 0, chars, 0, bytesArr.Length);
	return new string(chars);
	}

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How to get HTML page content programatically in C# ?

	public static string ReadPageContentFromUrl(string url)
	{
	WebClient client = new WebClient ();
	Stream data = client.OpenRead(url);
	StreamReader reader = new StreamReader(data, Encoding.UTF8);
	string html = reader.ReadToEnd();
	Encoding encFrom = Encoding.GetEncoding(readCharactersetFromHTML(html));
	html = ChangeEncoding(encFrom, Encoding.UTF8, html);
	data.Close ();
	reader.Close();
	return html;
	}

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Polish NIP validation

	public static bool ValidateNip(string nip)
	{
	if (nip.Length != 10) return false;
	try { Int64.Parse(nip); }
	catch { return false; }
	int[] weights = new int[] { 6, 5, 7, 2, 3, 4, 5, 6, 7 };
	int sum = 0;
	for (int i = 0; i < weights.Length; i++)
	sum += int.Parse(nip.Substring(i, 1)) * weights[i];
	return (sum % 11) == int.Parse(nip.Substring(9, 1));
	}

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Email address validation in C#

Not exacly compatible with iso:

	public static bool ValidateEmailAddress(string email)
	{
	if (email.Length > 254)
	return false;
	else
	{
	string[] emailParts = email.Split(new string[] { "@" }, StringSplitOptions.RemoveEmptyEntries);
	if (emailParts.Length != 2 || email.StartsWith("@") || email.EndsWith("@") || (new Regex("[@]{2,}", RegexOptions.None)).IsMatch(email))
	return false;
	else
	{
	if (emailParts[0].Length <= 64)
	{
	// alias
	Regex rx1 = new Regex(@"^[a-zA-Z0-9_-][a-zA-Z0-9_\.-]*[a-zA-Z0-9_-]$", RegexOptions.None);
	if (emailParts[0].Length > 64 || emailParts[0].Contains("..") || !rx1.IsMatch(emailParts[0]))
	return false;
	}
	else
	return false;
	// domain
	Regex rx2 = new Regex(@"^[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*\.[a-zA-Z]{2,63}$", RegexOptions.None);
	if (emailParts[1].Contains("--") || !rx2.IsMatch(emailParts[1]))
	return false;
	}
	}
	return true;
	}

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Convert datetime to timestamp and timestamp to datetime in C#

	public static readonly DateTime EpochUtc = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
	public static long ConvertDatetime2Timestamp(DateTime value)
	{
	TimeSpan elapsedTime = value - EpochUtc;
	return (long)elapsedTime.TotalSeconds;
	}
	public static DateTime ConvertTimestamp2Datetime(double timestampMilisec)
	{
	DateTime dateTime = DateTime.SpecifyKind(EpochUtc, DateTimeKind.Utc);
	return dateTime.AddSeconds(timestampMilisec);
	}

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How to convert encoding from one to another in C# ?

	public static string ChangeEncoding(Encoding encFrom, Encoding encTo, string srcStr)
	{
	// Convert the string into a byte[].
	byte[] fromBytes = encFrom.GetBytes(srcStr);
	// Perform the conversion from one encoding to the other.
	byte[] toBytes = Encoding.Convert(encFrom, encTo, fromBytes);
	// Convert the new byte[] into a char[] and then into a string.
	// This is a slightly different approach to converting to illustrate
	// the use of GetCharCount/GetChars.
	char[] toChars = new char[encTo.GetCharCount(toBytes, 0, toBytes.Length)];
	encTo.GetChars(toBytes, 0, toBytes.Length, toChars, 0);
	return new string(toChars);
	}

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How to remove directory with all its files and subdirs recursively ?

	public static void DeleteDirCompletely(string dirPath)
	{
	DirectoryInfo di = new DirectoryInfo(dirPath);
	foreach (var file in di.GetFiles())
	File.Delete(file.FullName);
	foreach (var dir in di.GetDirectories())
	Directory.Delete(dir.FullName);
	Directory.Delete(dirPath);
	}

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How to check if url is valid in C# ?

	public bool IsUrlValid(string url)
	{
	string pattern =
	@"^(http|https|ftp|)\://|[a-zA-Z0-9\-\.]+\.[a-zA-Z](:[a-zA-Z0-9]*)?/?([a-zA-Z0-9\-\._\?\,\'/\\\+&%\$#\=~])*[^\.\,\)\(\s]$";
	Regex reg = new Regex(pattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);
	return reg.IsMatch(url);
	}

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How to compute MD5 in C# ?

	public static string ComputeMd5(string input, bool convert2smallLetters = false)
	{
	MD5 md5 = MD5.Create();
	byte[] inputBytes = Encoding.ASCII.GetBytes(input);
	byte[] hash = md5.ComputeHash(inputBytes);
	StringBuilder sb = new StringBuilder();
	for (int i = 0; i < hash.Length; i++)
	{
	if (!convert2smallLetters)
	sb.Append(hash[i].ToString("X2"));
	else
	sb.Append(hash[i].ToString("x2"));
	}
	return sb.ToString();
	}

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How to add column to table in TSQL ?

	ALTER TABLE table_name
	ADD column_name datatype
	-- example
	ALTER TABLE schClients.tSenders_
	ADD Confirmed BIT NOT NULL DEFAULT 0
	GO

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Syntax from msdn

Generate random number in C#

	Random rnd = new Random();
	int dice = rnd.Next(1, 7); // creates a number between 1 and 6
	int card = rnd.Next(52); // creates a number between 0 and 51

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Insert Google Analitics code to Prestashop

Be carefull. You should not have any strings in your smarty template like this:
"{x.."
, because it's reserved for smarty variable and Prestashop uses smarty templates Instead use this:
"{ x...".
F.g:
<script>
  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

  ga('create', 'UA-....', 'auto');
  ga('send', 'pageview');
</script>
->
<script>
  (function(i,s,o,g,r,a,m){ i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
  m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

  ga('create', 'UA-....', 'auto');
  ga('send', 'pageview');
</script>

How to read value returned by stored procedure - TSQL ?

http://msdn.microsoft.com/en-us/library/ms188332.aspx

	DECLARE @ret INT
	EXEC @ret = [schImports].[uspInsertImport] 1

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	CREATE PROCEDURE [schImports].[uspInsertImport] (@importId int)
	AS
	BEGIN
	-- ...
	return @insertedNew;
	END

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How to disconnect Skype from Microsoft or Facebook account?

Solution in polish is here

Adding two integers without temporary variable - C#

	static void swamp(ref int x, ref int y)
	{
	x = x + y;
	y = x - y;
	x = x - y;
	}

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Read collection from configuration file app.config in C#

App.config:

	<configuration>
	<configSections>
	<section name="testConfig" type="Testy.ItemsConfigurationSection, Testy" />
	</configSections>
	<testConfig>
	<items>
	<item name="One" />
	<item name="Two" />
	</items>
	</testConfig>
	</configuration>

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Service classes:

	namespace Testy
	{
	public class ItemConfigurationElement : ConfigurationElement
	{
	[ConfigurationProperty("name", IsKey = true, IsRequired = true)]
	public string Name
	{
	get { return (string)this["name"]; }
	}
	}
	[ConfigurationCollection(typeof(ItemConfigurationElement), AddItemName = "item")]
	public class ItemsConfigurationElementCollection : ConfigurationElementCollection
	{
	protected override ConfigurationElement CreateNewElement()
	{
	return new ItemConfigurationElement();
	}
	protected override object GetElementKey(ConfigurationElement element)
	{
	return ((ItemConfigurationElement)element).Name;
	}
	}
	public class ItemsConfigurationSection : ConfigurationSection
	{
	[ConfigurationProperty("items", IsDefaultCollection = true)]
	public ItemsConfigurationElementCollection Tests
	{
	get { return (ItemsConfigurationElementCollection)this["items"]; }
	}
	}
	}

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Usage:

	try
	{
	ItemsConfigurationSection configManager = (ItemsConfigurationSection)ConfigurationManager.GetSection("testConfig");
	var zmienna = configManager.Tests;
	}
	catch (Exception ex)
	{
	throw;
	}

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