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C# Do While Loop

C# Do While Loop for beginners and professionals with examples on overloading, method overriding, inheritance, aggregation, base, polymorphism, sealed, abstract, interface, namespaces, exception handling, file io, collections, multithreading, reflection etc.

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C# Do-While Loop

The C# do-while loop is used to iterate a part of the program several times. If the number of iteration is not fixed and you must have to execute the loop at least once, it is recommended to use do-while loop.

The C# do-while loop is executed at least once because condition is checked after loop body.

Syntax:

do{
//code to be executed
}while(condition);
flowchart of do while loop in C#

C# do-while Loop Example

Let's see a simple example of C# do-while loop to print the table of 1.

using System;
public class DoWhileExample
    {
      public static void Main(string[] args)
      {
          int i = 1;
          
          do{
              Console.WriteLine(i);
              i++;
          } while (i <= 10) ;
  
     }
   }

Output:

1
2
3
4
5
6
7
8
9
10

C# Nested do-while Loop

In C#, if you use do-while loop inside another do-while loop, it is known as nested do-while loop. The nested do-while loop is executed fully for each outer do-while loop.

Let's see a simple example of nested do-while loop in C#.

using System;
public class DoWhileExample
    {
      public static void Main(string[] args)
      {
          int i=1;  
          
          do{
              int j = 1;
              
              do{
                  Console.WriteLine(i+" "+j);
                  j++;
              } while (j <= 3) ;
              i++;
          } while (i <= 3) ;  
     }
   }

Output:

1 1
1 2
1 3
2 1
2 2 
2 3
3 1
3 2
3 3

C# Infinitive do-while Loop

In C#, if you pass true in the do-while loop, it will be infinitive do-while loop.

Syntax:

do{
//code to be executed
}while(true);

C# Infinitive do-while Loop Example

using System;
public class WhileExample
    {
      public static void Main(string[] args)
      {
          
          do{
              Console.WriteLine("Infinitive do-while Loop");
          } while(true); 
      }
    }

Output:

Infinitive do-while Loop 
Infinitive do-while Loop
Infinitive do-while Loop
Infinitive do-while Loop
Infinitive do-while Loop
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