Generic Serialization Method - Microsoft C#.NET

using System.Xml.Serialization;
using System.Text;
public class SerializeManager
{
    public static XmlDocument Serialize(Type type, Object source)
    {
        MemoryStream stream = null;
        TextWriter writer = null;
        XmlDocument document = null;
        try
        {
            stream = new MemoryStream();
            writer = new StreamWriter(stream, Encoding.Unicode);
            XmlSerializer serializer = new XmlSerializer(type);
            serializer.Serialize(writer, source);
            int count = (int)stream.Length;
            byte[] array = new byte[count];
            stream.Seek(0, SeekOrigin.Begin);
            stream.Read(array, 0, count);
            UnicodeEncoding utf = new UnicodeEncoding();
            document = new XmlDocument();
            document.LoadXml(utf.GetString(array).Trim());
        }
        catch 
        {
            throw;
        }
        finally
        {
            if (stream != null) stream.Close();
            if (writer != null) writer.Close();
        }
        return document;
    }
}

Generic Clone Method C#.NET

Using reflection, this method copies each property of the source object to target object.

public virtual void Clone(Object source)
{
    if (source == null)
        throw new ArgumentNullException("Source");
    if (source.GetType() != this.GetType())
        throw new ArgumentException("Type Mismatch");
    foreach (PropertyInfo p in source.GetType().GetProperties())
        if (p.CanRead && p.CanWrite)
            p.SetValue(this, p.GetValue(source, null), null);
}

CSS Element selectors [pattern matching] - Cascade Style Sheet Syntax (CSS Syntax)

Pattern	Meaning	Described in section
*	Matches any element.	Universal selector
E	Matches any E element (i.e., an element of type E).	Type selectors
E F	Matches any F element that is a descendant of an E element.	Descendant selectors
E > F	Matches any F element that is a child of an element E.	Child selectors
E:first-child	Matches element E when E is the first child of its parent.	The :first-child pseudo-class
E:link E:visited	Matches element E if E is the source anchor of a hyperlink of which the target is not yet visited (:link) or already visited (:visited).	The link pseudo-classes
E:active E:hover E:focus	Matches E during certain user actions.	The dynamic pseudo-classes
E:lang(c)	Matches element of type E if it is in (human) language c (the document language specifies how language is determined).	The :lang() pseudo-class
E + F	Matches any F element immediately preceded by a sibling element E.	Adjacent selectors
E[foo]	Matches any E element with the "foo" attribute set (whatever the value).	Attribute selectors
E[foo="warning"]	Matches any E element whose "foo" attribute value is exactly equal to "warning".	Attribute selectors
E[foo~="warning"]	Matches any E element whose "foo" attribute value is a list of space-separated values, one of which is exactly equal to "warning".	Attribute selectors
E[lang|="en"]	Matches any E element whose "lang" attribute has a hyphen-separated list of values beginning (from the left) with "en".	Attribute selectors
DIV.warning	Language specific. (In HTML, the same as DIV[class~="warning"].)	Class selectors
E#myid	Matches any E element with ID equal to "myid".	ID selectors

Reference: W3C CSS Guidlines (Section 5: Selectors)

CLRProfiler (CLR Profiler) waiting for application to start common language runtime - .NET Runtime

Symptom: When you start an application using CLR profiler, it always says [waiting for application to start common language runtime] and wait forever

Resolution

1. Most probably you may be using CLR Profiler 1.1 to profile .NET 2.0 Application. Download CLR Profiler 2.0 from the here
   
2. 
   
   If it is VISTA or Windows XP, may be CLR Profiler doesn't have enough permissions to run. Try running CLR Profiler as an Administrator.
   Right Click on the CLRProfiler.exe -> Run as -> Administrator

Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding – Microsoft ADO.NET

Symptom: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

Resolution:

1. SqlConnection: If this happen when tries to connecting to SQL Server, then try increasing the timeout of the connection
   Connection String: server=Server;database=Database;uid=Uid;pwd=Pwd;timeout=600 (ConnectionTimeout is read-only)
2. SqlCommand: More interestingly if you manage to connect successfully and although you set a fat timeout value to your connection command object does not inherit the timeout from its connection. It uses its own timeout value. More logically ConnectionTimeout and CommandTimeout.   
   

    So increase the timeout of the command, which is not read-only like SQLConnection

    command.CommandTimeot = 600 (set to 10 minutes)  

Reference: ASP.NET Forums

String.Format(“{0:X}”, args[]) Function : C#.Net

Example: String.Format("{0:D}", DateTime.Now) = 17 Mar 2009

Symbol	Type	Representation
C	Currency:	(123.00)
D	Decimal	-123
E	Scientific	-1.234500E+002
F	Fixed point	-123.45
G	General (default)	-123 (default = 'G')
N	Number	-123.00
P	Percent	-12,345.00 %
R	Round-trip	-123.45
X	Hexadecimal	FFFFFF85
Date Time Formatting
Symbol	Type	Representation
d	Short date	07/09/2007
D	Long date	Monday, 09 July 2007
t	Short time	13:42
T	Long time	13:42:50
f	Full date/short time	Monday, 09 July 2007 13:42
F	Full date/long time	Monday, 09 July 2007 13:42:50
g	General date/short time	07/09/2007 13:42
G	General date/long time (default)	07/09/2007 13:42:50 (default = 'G')
M	Month	July 20
R	RFC1123	Mon, 09 Jul 2007 13:42:50 GMT
s	Sortable	2007-07-09T13:42:50
u	Universal sortable	2007-07-09 13:42:50Z (invariant)
U	Universal full	Monday, 09 July 2007 20:42:50
Y	Year	2007 July
Standard Enumeration Formatting
G	General (default)	Green (default = 'G')
F	Flags	Green (flags or integer)
D	Decimal number	3
X	Hexadecimal	00000003

Reference: String.Format - MSDN

Login Failed The user is not associated with a trusted SQL Server connection: SQL Server 2005

This occurs when you try to login using SQL Server user cardinals without configuring SQL Server to use Windows and SQL Server authentication.

Resolution:

[1] Open SQL Server management studio – [2] Login to SQL server using windows authentication – [3] Right click on SQL Server instance and go to properties – [4] Expand security tab and select 'SQL Server and Windows authentication mode' under 'Server Authentication'

Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding - Microsoft SQL Server 2005

Symptom:

SQL Server throws an exception 'Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. (Microsoft SQL Server, Error: -2) when try to connect from a remote computer. Most probable symptom for the error is TCP Port 1433 being blocked by the windows firewall in a computer running windows XP(SP2).

Solution

Scenario 1

Make sure you have enabled remote connections from the SQL Server surface area configuration and allow TCP/IP, Named Pipe protocol or combination as necessary.

• To Enable Remote connections: [1] SQL Server 2005 – [2] Configuration Tools – [3] SQL Server Surface area configuration – [4] Click on 'Surface area configuration for services and connections'.
  
• Expand [1] Database Engine – [2] Remote Connections – [3] Select Local and remote connections – [4] Select the desired protocol (In this scenario I have used TCP/IP and Named Pipes)
  
• Restart the SQL Server.
  

Scenario 2

Open TCP Port 1433 – This is the default port that SQL server use for remote connections. By default windows XP firewall deny access of this port:

• Open [1] Control Panel – [2] Windows Firewall – [4] Click on 'Add Port'
  
• Add: Name = SQL Server (Any meaningful name), Port Number = 1433 (by default, if you have changed the default port you have to make sure you enter the corresponding port number)

DATEDIFF Function - TSQL - Microsoft SQL Server 2000/2005

Ex: DATEDIFF(yyyy, applicant.DateOfBirth, GETDATE()) = 28 [age of applicant in years]

datepart - Abbriviation
year - yy, yyyy
quarter - qq, q
month - mm, m
dayofyear - dy, y
day - dd, d
week - wk, ww
hour - hh
minute - mi, n
second - ss, s
millisecond - ms
microsecond - mcs
nanosecond - ns