calculate elapsed seconds

System.Windows.Forms.Timer myTimer = new System.Windows.Forms.Timer();
static int counter = 0;
static bool b = false;
myTimer.Tick+=new EventHandler(myTimer_Tick);
myTimer.Interval = 1000;
myTimer.Start();
while (b == false)
 {

     // implement your code that corresond to the time not elapsed yet situation

     if(b==true)

     {

       // implement your code that corresond to the time already  elapsed  situation

       break;

     }        

 }

//implement this event handler method like this
static void myTimer_Tick(Object sender, EventArgs e)

        {

            // Stop the timer

            myTimer.Stop();

            /* Here we chose 2 seconds or a little more to be in timeout situation */

            if (counter < 2)

            {

                // Enable the counter

                myTimer.Enabled = true;

                // Increment the counter

                counter++;

            }

            // The condition related to witch the Spalsh form will be disposed

            if (counter == 2) b = true;

 

        }