Tag Archives: C sharp

How many constructor a class have in C# ?

Posted on September 7, 2017 | Leave a comment

Is it known as constructor overloading ?

//we can also print it from constructor
using System;


namespace ConstructorOverloading
{
    class GameScore
    {
         string user;
         int age;
         int salary;

        public GameScore() //it is default constructor
        {
            user = "Steven";
            age = 28;
            Console.WriteLine("Previous user: "+user+" and he was "+age+" year old");
        }

        public GameScore(string name,int age)
        {
            user = name;
            this.age = age;
            Console.WriteLine("Current user {0} and he is {1} years old",user,this.age);
        }

        public GameScore(int age, int salary)
        {
            this.age = age;
            this.salary = salary;
            Console.WriteLine("From the third constructor Age="+age+" Salary:"+salary);
        }

        public void Display(int no)
        {
            Console.WriteLine("Output from "+no+" no. Constructor");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            GameScore g1=new GameScore();
            GameScore g2=new GameScore("Zaki",25);
            GameScore g3=new GameScore(90,99);
            g3.Display(3);
            Console.ReadKey();
        }
    }
}

//we can also print it from constructor

using System;

namespace ConstructorOverloading

{

class GameScore

{

string user;

int age;

int salary;

public GameScore() //it is default constructor

{

user = "Steven";

age = 28;

Console.WriteLine("Previous user: "+user+" and he was "+age+" year old");

}

public GameScore(string name,int age)

{

user = name;

this.age = age;

Console.WriteLine("Current user {0} and he is {1} years old",user,this.age);

}

public GameScore(int age, int salary)

{

this.age = age;

this.salary = salary;

Console.WriteLine("From the third constructor Age="+age+" Salary:"+salary);

}

public void Display(int no)

{

Console.WriteLine("Output from "+no+" no. Constructor");

}

class Program

{

static void Main(string[] args)

{

GameScore g1=new GameScore();

GameScore g2=new GameScore("Zaki",25);

GameScore g3=new GameScore(90,99);

g3.Display(3);

Console.ReadKey();

}

Calling Method Example in C#

Posted on August 12, 2017 | Leave a comment

code:

with object creation from class:

using System;

namespace CallingMethods
{
    class Program
    {
       int Add(int a, int b)
       {
           int result;
           result = a + b;
           return result;
       }
        static void Main(string[] args)
        {
            int first, second;
            Console.WriteLine("1st number:");
            first=Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("2nd number");
            second = Convert.ToInt32(Console.ReadLine());
            Program obj1=new Program();
            
            int result = obj1.Add(first, second);
            Console.WriteLine("The addition is: "+result);
            Console.ReadKey();
        }
    }
}

using System;

namespace CallingMethods

{

class Program

{

int Add(int a, int b)

{

int result;

result = a + b;

return result;

}

static void Main(string[] args)

{

int first, second;

Console.WriteLine("1st number:");

first=Convert.ToInt32(Console.ReadLine());

Console.WriteLine("2nd number");

second = Convert.ToInt32(Console.ReadLine());

Program obj1=new Program();

int result = obj1.Add(first, second);

Console.WriteLine("The addition is: "+result);

Console.ReadKey();

}

If we don’t want to use object we can use static keyword here:

using System;

namespace CallingMethods
{
    class Program
    {
       static int Add(int a, int b)
       {
           int result;
           result = a + b;
           return result;
       }
        static void Main(string[] args)
        {
            int first, second;
            Console.WriteLine("1st number:");
            first=Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("2nd number");
            second = Convert.ToInt32(Console.ReadLine());
           
            
            int result = Add(first, second);
            Console.WriteLine("The addition is: "+result);
            Console.ReadKey();
        }
    }
}

using System;

namespace CallingMethods

{

class Program

{

static int Add(int a, int b)

{

int result;

result = a + b;

return result;

}

static void Main(string[] args)

{

int first, second;

Console.WriteLine("1st number:");

first=Convert.ToInt32(Console.ReadLine());

Console.WriteLine("2nd number");

second = Convert.ToInt32(Console.ReadLine());

int result = Add(first, second);

Console.WriteLine("The addition is: "+result);

Console.ReadKey();

}

Static method can be invoked with class name:

using System;

namespace CallingMEthods1
{
    class MyClass
    {
        public static void MyMethod()
        {
            Console.WriteLine("Showing From Method");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            MyClass.MyMethod();
            Console.ReadKey();
        }
    }
}

using System;

namespace CallingMEthods1

{

class MyClass

{

public static void MyMethod()

{

Console.WriteLine("Showing From Method");

}

class Program

{

static void Main(string[] args)

{

MyClass.MyMethod();

Console.ReadKey();

}

Can be invoked without creating objects:

using System;

namespace CallingMEthods1
{
    class Program 
    {
        public static void MyMethod()
        {
            Console.WriteLine("Showing From Method");
        }
    
        static void Main(string[] args)
        {
            MyMethod();
            Console.ReadKey();
        }
    }
}

using System;

namespace CallingMEthods1

{

class Program

{

public static void MyMethod()

{

Console.WriteLine("Showing From Method");

}

static void Main(string[] args)

{

MyMethod();

Console.ReadKey();

}

C# Windows Application Form

Posted on July 28, 2017 | Leave a comment

code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PersonalInformationApp
{
    public partial class MainUI : Form
    {
        public MainUI()
        {
            InitializeComponent();
        }

        private string firstName, lastName, fathersName, mothersName, address;

        private void AddressButton_click(object sender, EventArgs e)
        {
            MessageBox.Show(address);

        }

        private void parentsButton_click(object sender, EventArgs e)
        {
            fathersNameTextBox.Text = fathersName;
            mothersNameTextBox.Text = mothersName;
            MessageBox.Show("Fathers Name: " + fathersName + "\n" + "Mothers Name: " + mothersName);
        }

        private void saveButton_Click(object sender, EventArgs e)
        {
            firstName = firstNameTextBox.Text;
            lastName = lastNameTextBox.Text;
            fathersName = fathersNameTextBox.Text;
            mothersName = mothersNameTextBox.Text;
            address = addressTextBox.Text;

            firstNameTextBox.Text = "";
            lastNameTextBox.Clear();
            fathersNameTextBox.Text=string.Empty;
            mothersNameTextBox.Text = string.Empty;
            addressTextBox.Text = null;
        }

        private void showAllInformationButton_Click(object sender, EventArgs e)
        {
            firstNameTextBox.Text = firstName;
            lastNameTextBox.Text = lastName;
            fathersNameTextBox.Text = fathersName;
            mothersNameTextBox.Text = mothersName;
            addressTextBox.Text = address;
        }

        private void nameButton_Click(object sender, EventArgs e)
        {
            MessageBox.Show(firstName+" "+lastName);
        }

      
    }
}

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace PersonalInformationApp

{

public partial class MainUI : Form

{

public MainUI()

{

InitializeComponent();

}

private string firstName, lastName, fathersName, mothersName, address;

private void AddressButton_click(object sender, EventArgs e)

{

MessageBox.Show(address);

}

private void parentsButton_click(object sender, EventArgs e)

{

fathersNameTextBox.Text = fathersName;

mothersNameTextBox.Text = mothersName;

MessageBox.Show("Fathers Name: " + fathersName + "\n" + "Mothers Name: " + mothersName);

}

private void saveButton_Click(object sender, EventArgs e)

{

firstName = firstNameTextBox.Text;

lastName = lastNameTextBox.Text;

fathersName = fathersNameTextBox.Text;

mothersName = mothersNameTextBox.Text;

address = addressTextBox.Text;

firstNameTextBox.Text = "";

lastNameTextBox.Clear();

fathersNameTextBox.Text=string.Empty;

mothersNameTextBox.Text = string.Empty;

addressTextBox.Text = null;

}

private void showAllInformationButton_Click(object sender, EventArgs e)

{

firstNameTextBox.Text = firstName;

lastNameTextBox.Text = lastName;

fathersNameTextBox.Text = fathersName;

mothersNameTextBox.Text = mothersName;

addressTextBox.Text = address;

}

private void nameButton_Click(object sender, EventArgs e)

{

MessageBox.Show(firstName+" "+lastName);

}

Tag Archives: C sharp

How many constructor a class have in C# ?

Calling Method Example in C#

C# Windows Application Form

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Tag Archives: C sharp

How many constructor a class have in C# ?

Calling Method Example in C#

C# Windows Application Form

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Caution and Tips: