C# - do while Loop

The do while loop is the same as while loop except that it executes the code block at least once.

do
{
    //code block


} while(condition);

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 stops execution exits when a boolean condition evaluates to false. Because the while(condition) specified at the end of the block, it certainly executes the code block at least once.

int i = 0;

do
{
    Console.WriteLine("i = {0}", i);
    i++;

} while (i < 5);

Specify initialization out of the loop and increment/decrement counter inside do while loop.

Use break or return to exit from the do while loop.

int i = 0;

do
{
    Console.WriteLine("i = {0}", i);
    i++;
    
    if (i > 5)
        break;

} while (i < 10);

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);