Even numbers and factorials calculate

Hi dear,

here Is the logic code for your problem which is written in C#

private double GetFactorial(int number)
{
   if(number<=0)
       return 1;
   if(number<=2)
       return number;
   double fact=1;
   for(int i=number;i>0;i--)
   {
       fact=fact*i; 
    }
   return fact;
}

private bool IsEven(int number)
{
     if(number%2==0)
        return true;
     else
        return false;
}

private void Button1_Click(object sender,EventArgs e)
{
  int num1=Convert.ToInt32(txtNum1.Text);
  int num2=Convert.ToInt32(txtNum2.Text);
  string result="";
  if(num1  {
      for(int i=num1;i<=num2;i++)
      {
             if(IsEven(i))
             {
 result + = i.ToString() + " - "  + GetFactorial(i).ToString() + "\n";
             }
      }
  }
  else
  {
      for(int i=num2;i<=num1;i++)
      {
             if(IsEven(i))
             {
 result + = i.ToString() + " - "  + GetFactorial(i).ToString() + "\n";
             }
      }
  }
  rtbResult.Text=result;
}

Here I created two user define methods

1- for get factorial of any number ie GetFactorial(int)

2- for checking number is even or not ie IsEven(int)

Thank You,

please mark This is Correct answer if it is helpful to you