Wednesday, December 23, 2009

syntax to send mail in as forward

href="mailto:?subject=Check%20out%20this%20link...&">Mail Link to a Friend - forward

Mail Link to a Friend

Saturday, July 18, 2009

how to select top 2 max record in sql server

write the query for find the top 2 highest salary in sql server

select esalary from emp_sal e where 2>=(select count(distinct esalary)
from emp_sal where e.esalary<=esalary)

Wednesday, June 24, 2009

Dynamic controls in, Adding a dynamic control to a placeholder control and wire up the event in

ASP.NET provides a dedicated control the PlaceHolder control. You can place this control somewhere on your webform and later on use it to hang dynamic controls.

Now i am describing step by step how i generate and use LinkButton Dynamically.
Refer below code to generate Linkbutton at runtime.

Step 1-First take placeholder on your webform

Step 2-write this code on server side in c#

protected override void OnInit(EventArgs e)
for(int i=0;i<5;i++)

LinkButton LinkToEditPage = new LinkButton();

LinkToEditPage.Text = "Name" + i.ToString();
//Add new LinkButton to placeholder
LinkToEditPage.Attributes.Add("IdUser", "LinkButton" + i.ToString());
// Wire up the eventhandler
LinkToEditPage.Click += new EventHandler(LinkToEditPage_Click);

//its Event handler code below

protected void LinkToEditPage_Click(object sender, EventArgs e)
// Get the control and cast it to the
// appropriate type. In our case a LinkButton.

LinkButton LB = (LinkButton)sender;
string IdUser = LB.Attributes["IdUser"];

Response.Write("You Click on " + IdUser);


Step 3-see the output:

when you will run this webform, output will be show like refer below.

when you click on any of one output message will come accordingly.
suppose you have click on secod linkButton output will come as
"You Click on LinkButton2"

I hope this example can give you the idea how to generate dynamic control in and handle their event.

Tuesday, June 23, 2009

ASP.NET MVC for Visual Studio 2010 Available

Microsoft continues to provide solutions orbiting around its next-generation development platform and tools, well after the first public release of Visual Studio 2010 was launched in mid-May, 2009. The latest addition to the list of items designed to expand Visual Studio 2010 is ASP.NET MVC. The web framework tailored specifically for the first beta of Visual Studio 2010 is currently live on Microsoft's open-source project repository
website CodePlex, and is available for download. The company indicated that the bits were in Alpha stage for the time being. View More Information Here

Saturday, June 20, 2009

what is Hibernate Interview Questions

What is Hibernate?

Hibernate is an object-relational mapping (ORM) solution for the language.
it provides an easy to use framework for mapping an object-oriented domain model to a traditional relational database.Hibernate is a powerful, high performance object/relational persistence and query service. This lets the users to develop persistent classes following object-oriented principles such as association, inheritance, polymorphism, composition, and collections.

What is NHibernate?
NHibernate is an Object-relational mapping (ORM) solution for the Microsoft .NET platform. to know more about click here to know NHibernate

What is ORM?

ORM stands for Object/Relational mapping. It is the programmed and translucent perseverance of objects in a Java application in to the tables of a relational database using the metadata that describes the mapping between the objects and the database. It works by transforming the data from one representation to another.

What are the benefits of ORM and Hibernate?

There are many benefits from these. Out of which the following are the most important one.

1. Productivity – Hibernate reduces the burden of developer by providing much of the functionality and let the developer to concentrate on business logic.
2. Maintainability – As hibernate provides most of the functionality, the LOC for the application will be reduced and it is easy to maintain. By automated object/relational persistence it even reduces the LOC.
3. Performance – Hand-coded persistence provided greater performance than automated one. But this is not true all the times. But in hibernate, it provides more optimization that works all the time there by increasing the performance. If it is automated persistence then it still increases the performance.
4. Vendor independence – Irrespective of the different types of databases that are there, hibernate provides a much easier way to develop a cross platform application.

Thursday, June 18, 2009

sql query using substring function in sqlserver

Lets take a example suppose there is table - "tbl_emp"
contain column like tbl_emp(first_name,Last_name,"column3","column4",...)

suppose one row contain data like this:

First_name, last _name , "column3","column4",...
amit , pathak ,'..',''

now in result if you want name will show as Apathak in place of amit pathak
we can use this Query using substring function of sqlserver


Result: Apathak


I more expale of SUBSTRING with CHARINDEX function

I have seen a problem of one person detail below.

i have string like 1017 , 9 , 10-06-2009 , 1|'5001','FORMAN S COMMISSION ','9','2','0','0',10-06-2009,1|'5002','DEFAULT INTEREST (CHITTY)','9','2','0','0',10-06-2009,1

i want to remove first part i.e 1017 , 9 , 10-06-2009 , 1
and i want to use rest part of the string....


use substring function with charindex you will get string what you desire.......
i have seen problem there is "|" char find common in every column so on that behalf i have split the string and provide the need full result.

select substring('1017 , 9 , 10-06-2009 , 1|5001,FORMAN S COMMISSION', charindex( '|','1017 , 9 , 10-06-2009 , 1|5001,FORMAN S COMMISSION')+1, len('1017 , 9 , 10-06-2009 , 1|5001,FORMAN S COMMISSION')) from tbl_emp

SUBSTRING ( Pattern match,STRING)
result will be position of pattern where it matches.
Exp: SUBSTRING ( "M","AMIT Pathak") result will 2 because M is found on 2nd position in string "AMIT Pathak".

Wednesday, June 10, 2009

how to insert data from one table to another table in sql server

Every DBA needs to transfer data between tables.
lets we have create a table that has the following structure,

create table tbl_product_Information(
product_name char(50),
price float,
EntryDate datetime

and now we wish to insert one additional row into the table of the product data.

We will hence use the following SQL script:

INSERT INTO tbl_product_Information(product_name, price,Entry Date)
VALUES ('ABC', 900, 'Jan-10-1999')

Above is the very simple insert command.

The second type of INSERT INTO allows us to insert multiple rows into a table. Unlike the previous example, where we insert a single row by

specifying its values for all columns, we now use a SELECT statement to specify the data that we want to insert into the table. If you are thinking

whether this means that you are using information from another table, you are correct. The syntax is as follows:

INSERT INTO "table1" ("column1", "column2", ...)
SELECT "column3", "column4", ...
FROM "table2"

So this is the way you can insert data from one table to another table in sql server.

Tuesday, June 2, 2009

No value given for one or more required parameters - soultion : insert values into database using

How to Insert values into msaccess database using oledb and find the solution of error "No value given for one or more required parameters" :

Dim myOleDbConnection As OleDb.OleDbConnection
Dim insert As String
Dim value1, value2, value3, value4 As String

value1 = "'" & "ContactID" & "'" ' So to avoid the error("No value given for one or more required parameters") use ' single qoutes before and end of coulumn value
value2 = "'" & "FirstName" & "'"
value3 = "'" & "LastName" & "'"
value4 = "'" & "Sent" & "'"


Dim myConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;" _
& "Data Source=C:\Documents and Settings\Administrator\Desktop\schoolapp\SchoolApp\school.mdb;"
'"Provider=Microsoft.Jet.OLEDB.4.0;" & _ "Data Source = C:\Users\Edward\Desktop\db1.mdb;"

insert = "INSERT INTO Cancelled (ContactID, FirstName, LastName, Sent) VALUES (" & value1 & " ," & value2 & " ," & value3 & " ," & value4 & ")"

myOleDbConnection = New OleDb.OleDbConnection(myConnectionString)
Dim myOleDbCommand As New OleDb.OleDbCommand(insert, myOleDbConnection)

myOleDbCommand = myOleDbConnection.CreateCommand

myOleDbCommand.CommandType = CommandType.Text

myOleDbCommand.CommandText = insert



Catch ex As Exception
End Try

'-------Correct Query--------
' when you trace the value of insert will be : INSERT INTO Cancelled (ContactID, FirstName, LastName, Sent) VALUES ('ContactID' ,'FirstName' ,'LastName' ,'Sent')

'------Wrong Query-------
' basically the problem ("No value given for one or more required parameters") accurs when insert query will be :
' INSERT INTO Cancelled (ContactID, FirstName, LastName, Sent) VALUES (ContactID ,FirstName ,LastName ,Sent)
' because here inserted values doesn't have ' single quotes before and end of coulmn value which is mandatory while inserting data.

End Sub

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Friday, May 29, 2009

How to read xml file in

This Article will see how we can read and XML file it our ASP.NET application using, this trick is use full for making custom configuration files for your application or just reading data stored in an xml file.

Here is an XML save as name "countries.xml":

-------Create xml file follow image below----------------------------

-------End of xml File-----------------------------------------------------------

---------Code Snap-shot-------------

Out Put: Radiobuttonlist will generate like displayed below :




New Features in ASP.NET 3.5


With ASP.NET AJAX, developers can quickly create pages with sophisticated, responsive user interfaces and more efficient client-server communication by simply adding a few server controls to their pages. Previously an extension to the ASP.NET runtime, ASP.NET AJAX is now built into the platform and makes the complicated task of building cross-platform, standards based AJAX applications easy.

New ListView and DataPager Controls

The new ListView control gives you unprecedented flexibility in how you display your data, by allowing you to have complete control over the HTML markup generated. ListView‘s template approach to representing data is designed to easily work with CSS styles, which comes in handy with the new Visual Studio 2008 designer view. In addition, you can use the DataPager control to handle all the work of allowing your users to page through large numbers of records.

LINQ and other .NET Framework 3.5 Improvements

With the addition of Language Integrated Query (LINQ) in .NET Framework 3.5, the process of building SQL queries using error-prone string manipulation is a thing of the past. LINQ makes your relational data queries a first-class language construct in C# and Visual Basic, complete with compiler and Intellisense support. For Web applications, the ASP.NET LinqDataSource control allows you to easily use LINQ to filter, order and group data that can then be bound to any of the data visualization controls like the ListView and GridView controls. In addition, all the other improvements to .NET Framework 3.5, including the new HashSet collection, DateTime offset support, diagnostics, garbage collection, better thread lock support, and more, are all available to you in your ASP.NET applications.

WCF Support for RSS, JSON, POX and Partial Trust

With .NET Framework 3.5, Windows Communication Foundation (WCF) now supports building Web services that can be exposed using any number of the Internet standard protocols, such as SOAP, RSS, JSON, POX and more. Whether you are building an AJAX application that uses JSON, providing syndication of your data via RSS, or building a standard SOAP Web service, WCF makes it easy to create your endpoints, and now, with .NET Framework 3.5, supports building Web services in partial-trust situations like a typical shared-hosting environment.

New Web Features in Visual Studio 2008

New Web Design Interface

Visual Studio 2008 has incorporated a new Web designer that uses the design engine from Expression Web. Moving between design and source view is faster than ever and the new split view capability means you can edit the HTML source and simultaneously see the results on the page. Support for style sheets in separate files has been added as well as a CSS properties pane which clarifies the sometimes-complex hierarchy of cascading styles, so that it is easy to understand why an element looks the way it does. In addition Visual Studio 2008 has full WYSIWYG support for building and using ASP.NET Nested Master Pages which greatly improves the ability to build a Web site with a consistent look and feel.

JavaScript Debugging and Intellisense

In Visual Studio 2008, client-side JavaScript has now become a first-class citizen in regards to its debugging and Intellisense support. Not only does the Intellisense give standard JavaScript keyword support, but it will automatically infer variable types and provide method, property and event support from any number of included script files. Similarly, the JavaScript debugging support now allows for the deep Watch and Locals support in JavaScript that you are accustomed to having in other languages in Visual Studio. And despite the dynamic nature of a lot of JavaScript, you will always be able to visualize and step into the JavaScript code, no matter where it is generated from. This is especially convenient when building ASP.NET AJAX applications.

Multi-targeting Support

In previous versions of Visual Studio, you could only build projects that targeted a single version of the .NET Framework. With Visual Studio 2008, we have introduced the concept of Multi-targeting. Through a simple drop-down, you can decide if you want a project to target .NET Framework 2.0, 3.0 or 3.5. The builds, the Intellisense, the toolbox, etc. will all adjust to the feature set of the specific version of the .NET Framework which you choose. This allows you to take advantage of the new features in Visual Studio 2008, like the Web design interface, and the improved JavaScript support, and still build your projects for their current runtime version. c# interview questions and answers

C# interview questions and answers

  1. What’s the advantage of using System.Text.StringBuilder over System.String? StringBuilder is more efficient in the cases, where a lot of manipulation is done to the text. Strings are immutable, so each time it’s being operated on, a new instance is created.
  2. Can you store multiple data types in System.Array? No.
  3. What’s the difference between the System.Array.CopyTo() and System.Array.Clone()? The first one performs a deep copy of the array, the second one is shallow.
  4. How can you sort the elements of the array in descending order? By calling Sort() and then Reverse() methods.
  5. What’s the .NET datatype that allows the retrieval of data by a unique key? HashTable.
  6. What’s class SortedList underneath? A sorted HashTable.
  7. Will finally block get executed if the exception had not occurred? Yes.
  8. What’s the C# equivalent of C++ catch (…), which was a catch-all statement for any possible exception? A catch block that catches the exception of type System.Exception. You can also omit the parameter data type in this case and just write catch {}.
  9. Can multiple catch blocks be executed? No, once the proper catch code fires off, the control is transferred to the finally block (if there are any), and then whatever follows the finally block.
  10. Why is it a bad idea to throw your own exceptions? Well, if at that point you know that an error has occurred, then why not write the proper code to handle that error instead of passing a new Exception object to the catch block? Throwing your own exceptions signifies some design flaws in the project.
  11. What’s a delegate? A delegate object encapsulates a reference to a method. In C++ they were referred to as function pointers.
  12. What’s a multicast delegate? It’s a delegate that points to and eventually fires off several methods.
  13. How’s the DLL Hell problem solved in .NET? Assembly versioning allows the application to specify not only the library it needs to run (which was available under Win32), but also the version of the assembly.
  14. What are the ways to deploy an assembly? An MSI installer, a CAB archive, and XCOPY command.
  15. What’s a satellite assembly? When you write a multilingual or multi-cultural application in .NET, and want to distribute the core application separately from the localized modules, the localized assemblies that modify the core application are called satellite assemblies.
  16. What namespaces are necessary to create a localized application? System.Globalization, System.Resources.
  17. What’s the difference between // comments, /* */ comments and /// comments? Single-line, multi-line and XML documentation comments.
  18. How do you generate documentation from the C# file commented properly with a command-line compiler? Compile it with a /doc switch.
  19. What’s the difference between and XML documentation tag? Single line code example and multiple-line code example.
  20. Is XML case-sensitive? Yes, so and are different elements.
  21. What debugging tools come with the .NET SDK? CorDBG – command-line debugger, and DbgCLR – graphic debugger. Visual Studio .NET uses the DbgCLR. To use CorDbg, you must compile the original C# file using the /debug switch.
  22. What does the This window show in the debugger? It points to the object that’s pointed to by this reference. Object’s instance data is shown.
  23. What does assert() do? In debug compilation, assert takes in a Boolean condition as a parameter, and shows the error dialog if the condition is false. The program proceeds without any interruption if the condition is true.
  24. What’s the difference between the Debug class and Trace class? Documentation looks the same. Use Debug class for debug builds, use Trace class for both debug and release builds.
  25. Why are there five tracing levels in System.Diagnostics.TraceSwitcher? The tracing dumps can be quite verbose and for some applications that are constantly running you run the risk of overloading the machine and the hard drive there. Five levels range from None to Verbose, allowing to fine-tune the tracing activities.
  26. Where is the output of TextWriterTraceListener redirected? To the Console or a text file depending on the parameter passed to the constructor.
  27. How do you debug an ASP.NET Web application? Attach the aspnet_wp.exe process to the DbgClr debugger.
  28. What are three test cases you should go through in unit testing? Positive test cases (correct data, correct output), negative test cases (broken or missing data, proper handling), exception test cases (exceptions are thrown and caught properly).
  29. Can you change the value of a variable while debugging a C# application? Yes, if you are debugging via Visual Studio.NET, just go to Immediate window.
  30. Explain the three services model (three-tier application). Presentation (UI), business (logic and underlying code) and data (from storage or other sources).
  31. What are advantages and disadvantages of Microsoft-provided data provider classes in ADO.NET? SQLServer.NET data provider is high-speed and robust, but requires SQL Server license purchased from Microsoft. OLE-DB.NET is universal for accessing other sources, like Oracle, DB2, Microsoft Access and Informix, but it’s a .NET layer on top of OLE layer, so not the fastest thing in the world. ODBC.NET is a deprecated layer provided for backward compatibility to ODBC engines.
  32. What’s the role of the DataReader class in ADO.NET connections? It returns a read-only dataset from the data source when the command is executed.
  33. What is the wildcard character in SQL? Let’s say you want to query database with LIKE for all employees whose name starts with La. The wildcard character is %, the proper query with LIKE would involve ‘La%’.
  34. Explain ACID rule of thumb for transactions. Transaction must be Atomic (it is one unit of work and does not dependent on previous and following transactions), Consistent (data is either committed or roll back, no “in-between” case where something has been updated and something hasn’t), Isolated (no transaction sees the intermediate results of the current transaction), Durable (the values persist if the data had been committed even if the system crashes right after).
  35. What connections does Microsoft SQL Server support? Windows Authentication (via Active Directory) and SQL Server authentication (via Microsoft SQL Server username and passwords).
  36. Which one is trusted and which one is untrusted? Windows Authentication is trusted because the username and password are checked with the Active Directory, the SQL Server authentication is untrusted, since SQL Server is the only verifier participating in the transaction.
  37. Why would you use untrusted verificaion? Web Services might use it, as well as non-Windows applications.
  38. What does the parameter Initial Catalog define inside Connection String? The database name to connect to.
  39. What’s the data provider name to connect to Access database? Microsoft.Access.
  40. What does Dispose method do with the connection object? Deletes it from the memory.
  41. What is a pre-requisite for connection pooling? Multiple processes must agree that they will share the same connection, where every parameter is the same, including the security settings.