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C# Static Variable

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What is the use of static variable in C# ?

  • In C#, static is a keyword or modifier that belongs to the type not instance.So instance is not required to access the static members.
  • In C#, static can be field, method, constructor, class, properties, operator and event.
 Static Variable

Static Variable

  • Note: Indexers and destructors cannot be static.

Advantage of C# static keyword

Memory efficient:

    • Now we don't need to create instance for accessing the static members, so it saves memory.
    • Moreover, it belongs to the type, so it will not get memory each time when instance is created.

C# Static Field

  • A field which is declared as static, is called static field.
  • Unlike instance field which gets memory each time whenever you create object, there is only one copy of static field created in the memory.
  • It is shared to all the objects.
  • It is used to refer the common property of all objects such as rateOfInterest in case of Account, companyName in case of Employee etc.
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C# static field example

  • Let's see the simple example of static field in C#.
using System;  
   public class Account  
    {  
        public int accno;   
        public String name;  
        public static float rateOfInterest=8.8f;  
        public Account(int accno, String name)  
        {  
            this.accno = accno;  
            this.name = name;  
        }  
          
        public void display()  
        {  
            Console.WriteLine(accno + " " + name + " " + rateOfInterest);  
        }  
   }  
   class TestAccount{  
       public static void Main(string[] args)  
        {  
        Account a1 = new Account(101, "Sonoo");  
            Account a2 = new Account(102, "Mahesh");  
            a1.display();  
            a2.display();  
  
        }  
    }  
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C# examples - Output :

101  Sonoo    8.8
102  Mahesh  8.8

C# static field example 2: changing static field

  • If you change the value of static field, it will be applied to all the objects.
using System;  
   public class Account  
    {  
        public int accno;   
        public String name;  
        public static float rateOfInterest=8.8f;  
        public Account(int accno, String name)  
        {  
            this.accno = accno;  
            this.name = name;  
        }  
          
        public void display()  
        {  
            Console.WriteLine(accno + " " + name + " " + rateOfInterest);  
        }  
   }  
   class TestAccount{  
       public static void Main(string[] args)  
        {  
           Account.rateOfInterest = 10.5f;//changing value  
            Account a1 = new Account(101, "Sonoo");  
            Account a2 = new Account(102, "Mahesh");  
            a1.display();  
            a2.display();  
  
        }  
    }  


click below button to copy the code. By - c# tutorial - team

C# examples - Output :

101 Sonoo   10.5
102 Mahesh 10.5

C# static field example 3: Counting Objects

  • Let's see another example of static keyword in C# which counts the objects.
using System;  
   public class Account  
    {  
        public int accno;   
        public String name;  
        public static int count=0;  
        public Account(int accno, String name)  
        {  
            this.accno = accno;  
            this.name = name;  
           count++;  
        }  
          
        public void display()  
      {  
            Console.WriteLine(accno + " " + name);  
        }  
   }  
   class TestAccount{  
       public static void Main(string[] args)  
        {  
            Account a1 = new Account(101, "Sonoo");  
            Account a2 = new Account(102, "Mahesh");  
            Account a3 = new Account(103, "Ajeet");  
            a1.display();  
            a2.display();  
            a3.display();  
            Console.WriteLine("Total Objects are: "+Account.count);  
        }  
    }  
click below button to copy the code. By - c# tutorial - team
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C# examples - Output :

101 Sonoo 
102 Mahesh 
103 Ajeet
Total Objects are: 3


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