Best performance is the main concern to develop a successful application. Like a coin database is the tail side (back-end) of an application. A good database design provides best performance during data manipulation which results into the best performance of an application.
Suppose, you are sending mail to different-different users by using while loop and you forgot to insert while loop update statement. In this case SQL Server will generate thousands or millions of mail against a specific email address with in a min.
Sometimes we required to generate a comma separated list of columns values like a list of EmailIDs to send mail. In SQL Server, we can make a comma separated list by using COALESCE as shown in below.
In C#, Constructors are the special types of methods of a class which get executed when it's object is created. Constructors are responsible for object initialization and memory allocation of its class. There is always at least one constructor in every class. If you don't write a constructor in class, C# compiler will automatically provide one constructor for that class.
Data validation is a key aspect for developing web application. In Asp.net MVC, we can easily apply validation to web application by using Data Annotation attribute classes to model class. Data Annotation attribute classes are present in System.ComponentModel.DataAnnotations namespace and are availlable to Asp.net projects like Asp.net web application & website, Asp.net MVC, Web forms etc.
In ASP.NET MVC, ViewModel is a class that contains the fields which are represented in the strongly-typed view. It is used to pass data from controller to strongly-typed view.
In Asp.net MVC 3 & MVC4, we have three objects - ViewData, ViewBag and TempData to pass data from controller to view and in next request. Now question is that when to use ViewData, VieBag and TempData. All these three objects have its own importance. In this article I am trying to expose the use of these three.
In Asp.net MVC, sometimes we required to post the form on Enter key press. Asp.net MVC has no default button property like Asp.net. However, we can achieve this functionality by using jQuery in MVC.
File uploading functionality is generally used by the developers. Before uploading file on the server, to know the size of file is a good practice. By knowing file size, we can restrict the end user to upload large size files on the server since we have limited space on the server. We should check uploaded file size on server side as well client side.
Sometimes, we required to display form fields in non-editable mode. We can achieve this functionality by setting read-only or disabled attribute to form fields (textbox, label, checkbox, text area). Before using both these attributes, we should understand the key differences between read only and disabled attributes.
When we want to deploy our web application to live/local server, then we have two options for making built – Release mode and Debug mode. Both the modes have own importance and characteristics. The details about Release mode and Debug mode are as:
We can validate email address at client side and server side. To validate email address on client side, we can use java script with regular expression. Java script can check the regular expression pattern for valid email address. We have different regular expression patterns for validating email address.
In .net 3.5 some new generic delegates -Func<T>, Action<T> and Predicate<T> were introduced. Using generic delegates, it is possible to concise delegate type means you don’t have to define the delegate statement. These delegates are the Func<T>, Action<T> and Predicate<T> delegates and defined in the System namespace.
Delegate is a reference type that holds the reference of a class method. Any method which has the same signature as delegate can be assigned to delegate. Delegate is like function pointer in C++. There are three aspects to a delegate: Declaration, Instantiation and Invocation.
An extension method is a static method of a static class that can be invoked using the instance method syntax. Extension methods are used to add new behaviors to an existing type without altering. In extension method "this" keyword is used with the first parameter and the type of the first parameter will be the type that is extended by extension method.