Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
Articles by Nizamuddin Siddiqui
Page 190 of 196
How to use order by, group by in c#?
Order by is used to sort the arrays in the ascending or in the descending orderGroupBy operator belong to Grouping Operators category. This operator takes a flat sequence of items, organize that sequence into groups (IGrouping) based on a specific key and return groups of sequenceExampleclass ElectronicGoods { public int Id { get; set; } public string Name { get; set; } public string Category { get; set; } public static List GetElectronicItems() { return new List() { new ElectronicGoods { Id = 1, Name = "Mobile", Category = ...
Read MoreHow to subscribe to an Event in C# and can we have multiple subscribers to one Event in a C#?
Events enable a class or object to notify other classes or objects when something of interest occurs.The class that raises the event is called the publisher and the classes that handle the event are called subscribers.In the EventAn event can have multiple subscribers. A subscriber can handle multiple events from multiple publishers.Events that have no subscribers are never raised.The publisher determines when an event is raised; the subscribers determine what action is taken in response to the event.Exampleclass Program { static void Main() { var video = new MP4() { Title = "Eminem" }; ...
Read MoreWhat is #if DEBUG and How to use it in C#?
In Visual Studio Debug mode and Release mode are different configurations for building your .Net project.Select the Debug mode for debugging step by step their .Net project and select the Release mode for the final build of Assembly file (.dll or .exe).The Debug mode does not optimize the binary it produces because the relationship between source code and generated instructions is more complex.This allows breakpoints to be set accurately and allows a programmer to step through the code one line at a time.The Debug configuration of your program is compiled with full symbolic debug information which help the debugger figure ...
Read MoreWhat is bin and obj folder in C#?
Whenever we write a C# code and build or run the solution it generates 2 folders −binobjThese bins and obj has the compiled codeWhy do we have 2 folders?The reason is the compilation process goes through 2 stepscompilinglinkingIn the compiling every individual file is compiled into individual unitsThese compiled files will be later linked into one unit which can be a dll or an exeWhatever happens in the compiled phase will be added into obj folderThe final compilation that is the linked phase will go into bin folderThis obj folder is used in Conditional compilation or incremental compilationEx − I ...
Read MoreWhat is the difference between IEnumerable and IQueryable in C#?
IEnumerable exists in System.Collections Namespace.IQueryable exists in System. Linq Namespace.Both IEnumerable and IQueryable are forward collection.IEnumerable doesn’t support lazy loadingIQueryable support lazy loadingQuerying data from a database, IEnumerable execute a select query on the server side, load data in-memory on a client-side and then filter data.Querying data from a database, IQueryable execute the select query on the server side with all filters.IEnumerable Extension methods take functional objects.IQueryable Extension methods take expression objects means expression tree.ExampleIEnumerabledbContext dc = new dbContext (); IEnumerable list = dc.SocialMedias.Where(p => p.Name.StartsWith("T")); list = list.Take(1); Sql statement generated for the above querySELECT [t0].[ID], [t0].[Name] FROM ...
Read MoreHow to make a method deprecated in C#?
The Obsolete Attribute marks elements like classes, methods, properties, fields, delegates, and many others within our code as deprecated or obsolete. The attribute is read at compile time and it is used to generate a warning or an error to the developer.This attribute can help if we have ever wanted to make sure programmers use newer versions of methods. It also makes it easier when we are transitioning from older methods to newer ones. Marking an item as obsolete warns users that program elements will be removed in future versions of the code base.This attribute is found in the System ...
Read MoreWhat is the difference between Finalize and Dispose in C#?
FinalizeFinalize() is called by the Garbage Collector before an object that is eligible for collection is reclaimed. Garbage collector will take the responsibility to deallocate the memory for the unreferenced object. The Garbage Collector calls this method at some point after there are no longer valid references to that object in memory.The framework does not guarantee that when this will happen, we can force for Garbage Collection but it will hurt performance of a program. Finalize() belongs to the Object class and it will be called by the runtime.Exampleusing System; namespace DemoApplication{ public class Demo{ ~Demo(){ ...
Read MoreWhat is explicit implementation and when to use in the interface in C#?
If a class implements two interfaces that contain a member with the same signature, then implementing that member on the class will cause both interfaces to use that member as their implementation.It's possible to implement an interface member explicitly—creating a class member that is only called through the interface, and is specific to that interfaceExampleinterface ICar{ void display(); } interface IBike{ void display(); } class ShowRoom : ICar, IBike{ void ICar.display(){ throw new NotImplementedException(); } void IBike.display(){ throw new NotImplementedException(); } } class Program{ static void Main(){ Console.ReadKey(); } }
Read MoreWhat are union, intersect and except operators in Linq C#?
UnionUnion combines multiple collections into a single collection and returns a resultant collection with unique elementsIntersectIntersect returns sequence elements which are common in both the input sequencesExceptExcept returns sequence elements from the first input sequence that are not present in the second input sequenceExampleclass Program{ static void Main(){ int[] count1 = { 1, 2, 3, 4 }; int[] count2 = { 2, 4, 7 }; var resultUnion = count1.Union(count2); var resultIntersect = count1.Intersect(count2); var resultExcept = count1.Except(count2); System.Console.WriteLine("Union"); ...
Read MoreWhich one is better Build, Rebuild, or Clean in C#?
Build solutionThis will perform an incremental build. In other words it will only build code files which have changed.If they have not changed those files will not be touched. Compiles code files (DLL and EXE) which are changed.Rebuild solutionThis will delete all currently compiled files (i.e., exe and DLLs) and will build everything from scratch,Irrespective of if there is code change in the file or not.Clean solutionThis menu will delete all compiled files (i.e., EXE’s and DLL’s) from the bin/obj directory.Rebuild = Clean + Build
Read More