C# - do while Loop

The do-while loop is the same as the while loop except that in the do-while loop, the code block will be executed at least once.

do
{
    //code block
} while(boolean expression);

The do-while loop starts with the do keyword followed by a code block and a boolean expression with the while keyword. The do-while loop exits when a boolean expression returns false.

int i = 0;
do
{
                        Console.WriteLine("Value of i: {0}", i);
    i++;
} while (i < 10);

Just as in the case of the for and while loops, you can break out of the do-while loop using the break keyword.

int i = 0;
do
{
                        Console.WriteLine("Value of i: {0}", i);
    i++;
    
                        if (i > 5)
                        break;
} while (true);

Nested do-while

The do-while loop can be used inside another do-while loop.

int i = 0;
do
{
                        Console.WriteLine("Value of i: {0}", i);
                        int j = i;
    i++;
                
                        do
    {
                        Console.WriteLine("Value of j: {0}", j);
        j++;
    } while (j < 2);
} while (i < 2);