Learn Angular, MVC Core, EF Core, SQL Server Step By Step

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pause >nul

STACK AND HEAP

Primitive Data Type : Number, float, Boolean etc. are called Primitive Data Type Most probably , Primitive Data Types created on stack.

STACK AND HEAP

When .NET application runs then all variables allocate in RAM / temp memory and its operating system/programming language divide it into two types of memory one is Stack and another one Heap

Stack is used for Static Memory allocation and Heap for Dynamic memory allocation and both are stored in the RAM.

STACK

Stack always reserved in the Last in first out i.e. LIFO.
Variable allocated on the stack are stored directly to the memory and access to this memory is very fast.
We can use the Stack if we know exactly how much data have required to allocate before compile time. While in Heap we don't know exactly.
Insert the data item at the top of Stack is called PUSH.
Delete the data item at the top of Stack is called POP.

HEAP

Heap is a area of memory where chunk are allocated to store to certain kind of data object.
Variable allocated on the Heap have their memory allocated at run time and accessing this memory bit slower.

C# Code

static void Main(string[] args)
        {
            //line1
            int i= 10;
            //line2
            int y = i;
            // line3
            Customer x = new Customer();
            x.name = "Raushan";
            // line 4
            Customer z = x;
            z.name = "Kumar"; 

            Console.WriteLine("Hello World!");
        }

Line 1 : It is a Primitive Data Type and runs and i=10 assigned into the stack with value and its address pointer. When memory address and value has stored at same place is termed as Value Types i.e. " Value type are those type which address and actual data stored at same place".

Line 2: When it will run then value of y=10 stored in top of stack and it will never effect the value of i and vice versa is termed as by value Type. Mostly Primitive Data type created on stack.

Line 3: A Class which is not a primitive data type its an object. And in that case its address stored into the stack and value stored into Heap its termed as reference type i.e. "Reference type are those type where in the pointer is stored on the stack but actual data stored on the Heap".

Line 4: we have assign value to z =x it means that reference of z and x is same in case of value type reference of both i & y was different. so when we change the value of x then value of z will be also change and vice-versa its also comes under reference type.

Memory Leak

Memory Leak Occurs when a programmer create a memory in heap and forget to delete it. To avoid this leak memory allocated on heap should always be freed when no longer needed.

Garbage Collector

When class object is created at runtime, certain memory space allocated to it in the Heap memory .After all action of objects are completed in the program there has no longer need of memory allocated space then Garbage Collector automatically release the memory space.

Thank You...!

Boxing and Unboxing

23th Day

Hey Guys, I hope that you are Enjoying with my blogs writing and in previous blog we have learnt about Memory Leak , Garbage Collector and Today's we will learn Boxing and Unboxing . Let's see

Boxing ,When a value type is move to a reference type its called Boxing and vice versa for Unboxing.

For Example In this code

int i = 10;//Value type
object o = i;//Boxing
int y=(int)o;//Unboxing

Boxing is an implicit Conversion from value type to reference type.
Here i=10 has stored in stack with address above shown in diagram its moving value i to o its a value type.

Unboxing

Unboxing is an explicit Conversion from reference type to value type.
And in heap o=10 its also moving from o to y its a reference type.

Let's see the result of boxing and Unboxing

        static void Main(string[] args)
        {    //Line1 Warm period
             Heavyloop();
             Heavyloop();
             //Line2 
            Stopwatch s1 = new Stopwatch();
            s1.Start();
            Heavyloop();
            s1.Stop();
             //Line3 
            Console.WriteLine(s1.ElapsedTicks);
            Console.WriteLine("Hello World!");
            Console.ReadLine();
        }

Line 1: Function will run as it is for warmup period and then actual measuring will start from Line 2.
Line2: Stopwatch measure time below of milli sec and now will start measure its ElapsedTicks.
      static void Heavyloop()
        {
            for(int i=0; i<100000;i++)
            {
                int z = 10;//Value Type
                object x = z;// reference type
            }
        }

static void Heavyloop(), in this function we written code for boxing and Unboxing how much time it will take in performance. For that we set stopwatch.
stopwatch, find function how much time taking for execution.
Now let's run this code ,sometimes give 5 digits figure or 4 digits figure
1st output ElapsedTicks:
2nd output ElapsedTicks
3rd output ElapsedTicks

It means that in non Primitive Data type, Due to Boxing and Unboxing its figure digits are different most of the time may be 4 to 5 digits.
But in case of Primitive Data type always be the same figure due to no Boxing , Unboxing occurs.

Collection

It is similar to array, it provides more flexible way to work with group of objects.
It can grow and shrink Dynamically.
            // line 1
           int[] salesfigures = new int[] { 1000, 2000 };
           // line 2
            ArrayList l = new ArrayList();
            l.Add(1);
            l.Add("one");
            Console.WriteLine("Hiii"); /line 3
            List<int> Is = new List<int>();
            Is.Add(1);
Line 1: It is Strongly typed and there are no Boxing/Unboxing so its performance will be faster. Its resizing is difficult. This is an Array.

Line 2: Boxing/Unboxing will be happen that's why its performance will be slower but it will be very flexible. This is the array list.

Suppose we want flexible as well as good performance for that we have to create Generic collection i.e. "A collection which has strongly typed ,flexibility as well as it improves the performance, Avoiding Boxing/Unboxing is called Generic Collection ".

List<T>, Dictionary< Tkey, Tvalue>, sortedlist<Tkey,Tvalue>, Queue<T>, Stack<T>, Hashset<T> are used in Generic Collection.
There are three types of Collection

Array
Array list
Generic list.

Must watch this video for more detail learning...

Thank You...! for reading my Article...

Memory Leak , Garbage Collector

22th Day

Hey Guys, I hope that you are Enjoying with my blogs writing and in previous blog we have learnt about Primitive Data Type, And then see Stack, Heap, Value Type and Reference Type and Today's we will Memory Leak , Garbage Collector

Memory Leak

Memory Leak Occurs when a programmer create a memory in heap and forget to delete it. To avoid this leak memory allocated on heap should always be freed when no longer needed.

All Primitive Data type runs on stack , after end of the scope it release the memory space automatically at a time because its memory location is Contiguous while in Heap doesn't.

Garbage Collector

When class object is created at runtime, certain memory space allocated to it in the Heap memory .After all action of objects are completed in the program there has no longer need of memory allocated space in that situation Garbage Collector automatically release the memory space.

Garbage Collector runs in the background its a background process.
It runs un-deterministically it means we doesn't know when it will come to release space.in that case application stops for naino sec.

Lets see the code garbage collector is run or not.

for(int i=0; i<100000; i++)
  {
    //line1
     int i = 10;
     int y = i;            
  }

Line1: In that only has primitive Data type, so garbage Collector will not come to release the memory. Because it release automatically.

let's see Click on debug -> Performance Profiler -> Memory Usage and Start

So we can see in the above snapshot there are no appear GC in primitive Data type.

C# Code , To see the Garbage Collector

for(int i=0; i<100000; i++)
  {
       //line1
        int i1 = 10;
        int y = 10;
      // line2
        Customer x = new Customer();
        x.name = DateTime.Now.ToString();
        Thread.Sleep(50);
 }

Line2: In that Case we can see the garbage collector in red-red sign randomly.

You must watch this video to more details learning.

Thank You...!

BootStrapping Angular cycle

16th Day

Hey Guys, I hope that you are enjoying with my blogs writing and in previous blog we have created a project and used ngModel and Directives and today's we will see concepts of Bootstrapping Angular Cycle so let's see Introduction .

Angular is a binding framework that is used to create web application. Angular uses typescript to write our business logic and method but browser does not understand typescript. The browser understand JavaScript . so that's why Angular CLI come into picture.

Angular CLI is a command-line interface tool that use to initialize, develop, scaffold and maintain Angular application directly from a command shell. It help us to create projects easily and quickly.

Work of BootSrapping

As we know that about view , model and component.
View i.e. app.component.html
model i.e. app.model.ts
Component i.e. app.component.ts
Module i.e. app.module.ts
index.html: This is the first file which will run and this file run to main.ts and it is run to Module.
i.e. first will run index.html->it will run to main.ts-> it will run to module.
platformBrowserDynamic().bootstrapModule(AppModule)
.catch(err => console.error(err));
In main.ts, These above code run the module.

It is Called Decorator.
@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,FormsModule
  ],
  providers: [],
  bootstrap: [AppComponent]// Which will invoked first it has mentioned in bootstrap.
})
export class AppModule { }

In this Bootstrap , AppComponent will invoked first.
export class AppModule{} it is very simple TypeScript class
View and Component ,connected with template url. which is mentioned in below component.

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  //its ment to specify the html
  styleUrls: ['./app.component.css']
  //its ment to specify the html
})

In index.html has "<app-root></app-root>" is called selector.Gets loded into view.

Button Click And Grid: We have button and patient object, we want to add in internal collection and it should be display in table

Its Input has mentioned in previous block click here

Output:

Must refer this videos for more details:

Thank You...!

SQL Indexes Clustered and Non Clustered

Hey Guys, I hope that you are enjoying with my blogs writing and today's we will cover some "SQL SERVER" Concepts.

Microsoft SQL Server is a relational database management system, or RDBMS, developed and marketed by Microsoft.

As a database server, it is a software products with primary function of storing and retrieving data as requested by other software application.

Initial Releases is April 24, 1989;

Indexes

Indexes Improves the performance of search or An index is one of the important paths to make the performance of SQL server database high.
An index is a pointer to data in a table.
It helps to speed up select queries and Where clause but it slow down data input with the Insert, Update and Delete.
They are stored in a B- tree structure (Balance search tree) that helps SQL Server users quickly and efficiently find the rows or associated with key values.
Defragmentation in SQL, It changes the physical ordering of data (as it loses contiguous allocation) and the retrieval becomes time consuming, resulting in slow database performance.

Types of SQL Server Indexes

There are two types of Indexes in SQL server.

1. Clustered 2. Non-Clustered

SQL Backing up, Restore and script based

Hey Guys, I hope that you are enjoying with my blogs writing and today's we will cover some "SQL SERVER" Concepts.

Microsoft SQL Server is a relational database management system, or RDBMS, developed and marketed by Microsoft.

As a database server, it is a software products with primary function of storing and retrieving data as requested by other software application.

Initial Releases is April 24, 1989;

Backup: A copy of SQL server data that can be used to restore recover the data after failure.
A backup of SQL server that is created at the level of database or one or more of its file or filegroup.
Full Backup: The most basic and complete type of backup is a full backup. This type of backup makes a copy of all data to a storage device, such as disk or tape
Incremental Backup: It is a type of backup that only copies data that has been changed or created since the previous backup activity was conducted.
Differential Backup: A data backup that is based on the latest full backup of a complete or partial database.
Incremental backup, sometimes called Differential backup while Differential backup are sometimes called "Cumulative backup".
Transaction Log: It is an integral part of SQL. Every database has a transaction file that is stored within the log file that is separated from data file It records all database modification.

Steps for backup:

Connect to the server and expand database -> Right click on database

A new windows will be open then select which type of backup you want , so I have selected full backup .

Select backup destination with .bak extension

And finally its backup has completed.

And this is my back file in D drive

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