This is the code from the main page of my Visual Studio UWP program:

using System;

public class Program

{

public static void Main() //Main function

{

int num; //integer variable declaration

String name,sel; //String variable declaration

bool cont=true; //Boolean variable declaration

Console.WriteLine("Enter your Name:"); //Displays text

name=Console.ReadLine(); //Takes user input, stores it in varaiable name

Console.WriteLine("Hi "+name); //Displays value of variable name

Console.WriteLine("Enter a number ");

try{ //resolves run time error if user enters string instead of integer

String t=Console.ReadLine();

num=Convert.ToInt32(t);

Console.WriteLine("You have entered number "+num);

while(cont){ //Runs loop until user enters a number other than 1 or 2

Console.WriteLine("====================================================================");

Console.WriteLine("Enter 1 to see if entered number is odd or even");

Console.WriteLine("Enter 2 to calculate the factorial of the number" );

Console.WriteLine("Press any other key to Exit");

Console.WriteLine("====================================================================");

sel=Console.ReadLine();

switch(sel) //switch case to perform function selected

{

case "1": //check whether number is even or odd

if(num%2==0){ //even number has remainder 0 when divided by 2

Console.WriteLine("Number "+num+" is an even number.");

}

else{

Console.WriteLine("Number "+num+" is an odd number.");

}

break; //to terminate the current execution of switch

case "2": //

if(num==1 || num==0){ //factorial of 1 or 0 is 1

Console.WriteLine("Factorial of number "+num+" is 1");

}

else{

int fact=1;

for (int i=num;i>=1 ;i--){ //calculate factorial using for loop

fact=fact*i;

}

Console.WriteLine("Factorial of number "+num+" is "+fact);

}

break;

default: //execute when user press any key other than 0 or 1

Console.WriteLine("Thank You ");

cont=false; //terminate the while loop as the condition will turn to false

break;

}

}

}

catch(FormatException e){ //handling run time error while converting string to integer

Console.WriteLine("Please Enter an Integer" ); //display this message if runtime error occurs

}

}

}

When I debug it, I get error: Data at the root level is invalid, line 16 postion 1. Why is this and how can I make this project compile?

Line 16 is: using System;