for (int i = 0; i >= 10; i++); // run for loop without body
{
Console.WriteLine ("Hello this is a for loop");
}
The above code is executing the for loop with empty body.the ';' char before the opening braces causes the prog treat the for loop empty & the Console.WriteLine ("Hello this is a for loop"); statement an individual code not part of loop.
Remove the semi colon from the end of for loop & it will work perfectly.
Also please mention the language next time.