Working with Shift Register

const int DataPin = 2;
const int ClockPin = 3;
const int LatchPin = 4;

byte Data = 0;

void setup()
{
  pinMode (DataPin, OUTPUT);
  pinMode (ClockPin, OUTPUT);
  pinMode (LatchPin, OUTPUT);
}

void loop()
{
  shiftWrite (0,1);
  delay(1000);
  shiftWrite (1,1);
  delay(1000);
  shiftWrite (2,1);
  delay(1000);
  shiftWrite (3,1);
  delay(1000);
  shiftWrite (4,1);
  delay(1000);
  shiftWrite (5,1);
  delay(1000);
  shiftWrite (6,1);
  delay(1000);
  shiftWrite (7,1);
  delay(1000);
  shiftWrite (0,0);
  delay(1000);
  shiftWrite (1,0);
  delay(1000);
  shiftWrite (2,0);
  delay(1000);
  shiftWrite (3,0);
  delay(1000);
  shiftWrite (4,0);
  delay(1000);
  shiftWrite (5,0);
  delay(1000);
  shiftWrite (6,0);
  delay(1000);
  shiftWrite (7,0);
  delay(1000);
}

void shiftWrite(int Pin, boolean State)
{
  bitWrite (Data, Pin, State);
  digitalWrite (LatchPin, LOW);
  shiftOut (DataPin, ClockPin, MSBFIRST, Data);
  digitalWrite (LatchPin, HIGH);
}