Difference between Dataset and DataReader

DataSet object	DataReader object
It is defined with multiple tables.	It is a read only and forward only data.
It is a disconnected architecture	It is comes under connected architecture.
Read/Write access	Read-only access
Bind to multiple controls	Bind to a single control
Slower access to data	Faster access to data
Dataset is non persistence.	DataReader is persistence.

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HTTPHandler and HTTPModule in ASP.NET

If you want to implement pre-processing logic before a request hits the IIS resources. For instance you would like to apply security mechanism, URL rewriting, filter something in the request, etc. ASP.NET has provided two types of interception HttpModule and HttpHandler . The web server examines the file name extension of the requested file, and determines which ISAPI extension should handle the request. Then the request is passed to the appropriate ISAPI extension. For Example When an .aspx page is requested it is passed to ASP.Net page handler. Then Application domain is created and after that different ASP.Net objects like Httpcontext, HttpRequest, HttpResponse. HTTPModule: - It's just like a filter. The Modules are called before and after the handler executes . - HTTP Modules are objects which also participate the pipeline but they work before and after the HTTP Handler does its job, and produce additional serv...

Connected and disconnected architecture in ADO.Net with Example

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Using SQL self join Find Upper level manager in Employee table

A self-join is a query in which a table is joined (compared) to itself. Self-joins are used to compare values in a column with other values in the same column in the same table . You can use a self-join to simplify nested SQL queries where the inner and outer queries reference the same table . These joins allow you to retrieve related records from the same table. The most common case where you'd use a self-join is when you have a table that references itself I have the employee detail table, In that i want to find the manager for each Employee . The employee nam e and manager column are present in same table Consider the following Employee table CREATE TABLE Employee ( Emp_Id INT IDENTITY ( 1 , 1 ) NOT NULL PRIMARY KEY , Emp_Name VARCHAR ( 100 ), Manager_Id INT NULL ) INSERT INTO Employee ( Emp_Name , Manager_Id ) VALUES ( 'a' ,null) INSERT INTO Employee ( Emp_Name , Manager_Id ) ...

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