C# Creating a Square

Question

I'm trying to create an application that inputs a Width and Height to design a square. I've gotten the error handling for inputting the numbers for the Width and Height. I find myself writing...

//Integer for Width == W
int W;
//Integer for Height == H
int H;
      if (W == 1 && H == 1)
      {
         Console.WriteLine("*");
      }
      else if (W == 1 && H == 2)
      {
         Console.WriteLine("*\n" +
                           "*");
      }
      else if (W == 1 && H == 3)
      {
         Console.WriteLine("*\n" +
                           "*\n" +
                           "*");
      }
     //~~~~~~~~~~~~~~~~~~~~~~~~~~~
      else if (W == 1 && H == 20)
      {
         Console.WriteLine("*\n" +
                           "*\n" +
                          //~~~~~~~
     //For readability 20th"*");

Also, assuming I'd do (else if) another 396 more times to satisfy the variances (20 * 20 = 400) 400 possibilities to build this square.

I'm asking if there is any looping methods that could help me reduce the code I need to complete making my square out of Console.WriteLine("*").

if(W == 1 && H == 1) ~~~ else(W == 20 && H == 20)

Or am I stuck writing the 400 possible instances of the width and height of my square?

The desired result for the display

 ****
 *  *
 *  *
 ****

Thanks for your time and consideration of my question.

Answer 1

Logic would be simple:

write * character as many times as W, then write new line to start new row - repeat this as many times as H

Putting it into code:

var W = 10;
var H = 10;

for (var i = 0; i < H; i++)
{
    for (var j = 0; j < W; j++)
    {
        Console.Write('*');
    }

    Console.WriteLine();
}

Using more concise code:

for (var i = 0; i < H; i++)
{
    Console.WriteLine(new string('*', W));
}

UPDATE

In order to draw only border with characters:

var W = 10;
var H = 10;

for (var i = 0; i < H; i++)
{
    // for bottom and for top borders - print full line
    if (i == 0 || i == H - 1)
        Console.WriteLine(new string('*', W));
    // for other, print just W-2 spaces with * at the edges
    else
        Console.WriteLine('*' + new string(' ', W - 2) + '*');
}