Draw Canvas line problem

Hi folks,

I have a created a Canvas line. here is my source code:

using System;
namespace DemoCanvas
{
public class Canvas
{
//char[][] canvasArray;
char[,] canvasArray;
int w, h;
public Canvas(int w, int h)
{
h += 2;
w += 2;
this.w = w;
this.h = h;
canvasArray = new char[h,w];
drawLine(0, 0, this.w - 1, 0, '-');
drawLine(0, this.h - 1, this.w - 1, this.h - 1, '-');
drawLine(0, 1, 0, this.h - 2, '|');
drawLine(this.w - 1, 1, this.w - 1, this.h - 2, '|');
}
public void bucketFill(int x, int y, char mchar)
{
if ((int)canvasArray[y, x] != 0)
{
return;
}
if (x > 0 || x < this.h || y > 0 || y < this.w)
{
if ((int)canvasArray[y, x] == 0)
canvasArray[y, x] = mchar;
bucketFill(x + 1, y, mchar);
bucketFill(x - 1, y, mchar);
bucketFill(x, y - 1, mchar);
bucketFill(x, y + 1, mchar);
}
}
public void drawLine(int x1, int y1, int x2, int y2, char mchar)
{
for (int i = y1; i <= y2; i++)
{
for (int j = x1; j <= x2; j++)
{
canvasArray[i, j] = mchar;
}
}
}
public void drawRectangle(int x1, int y1, int x2, int y2, char mchar)
{
drawLine(x1, y1, x2, y1, mchar);
drawLine(x1, y1, x1, y2, mchar);
drawLine(x2, y1, x2, y2, mchar);
drawLine(x1, y2, x2, y2, mchar);
}
public void render()
{
for (int i = 0; i < this.h; i++)
{
for (int j = 0; j < this.w; j++)
{
Console.WriteLine(canvasArray[i, j]);
}
//Console.WriteLine();
}
}
}
class Program
{
static void Main(string[] args)
{
string command = "";
while (command != "Q")
{
Console.WriteLine("Enter Your Command:(E.g C 4 2) ");
command = Console.ReadLine();
draw(command);
}
Console.WriteLine("Program Exited!");
}
static Canvas canvas;
private static void draw(String command)
{
char ch = command[0];
String[] cmd;
switch (ch)
{
case 'C':
cmd = command.Split(' ');
canvas = new Canvas(int.Parse(cmd[1]), int.Parse(cmd[2]));
canvas.render();
break;
case 'L':
cmd = command.Split(' ');
if (canvas == null)
{
Console.Error.WriteLine("Please draw a canvas first");
return;
}
canvas.drawLine(int.Parse(cmd[1]), int.Parse(cmd[2]), int.Parse(cmd[3]), int.Parse(cmd[4]), 'X');
canvas.render();
break;
case 'R':
cmd = command.Split(' ');
if (canvas == null)
{
Console.Error.WriteLine("Please draw a canvas first");
return;
}
canvas.drawRectangle(int.Parse(cmd[1]), int.Parse(cmd[2]), int.Parse(cmd[3]), int.Parse(cmd[4]), 'X');
canvas.render();
break;
case 'B':
cmd = command.Split(' ');
if (canvas == null)
{
Console.Error.WriteLine("Please draw a canvas first");
return;
}
canvas.bucketFill(int.Parse(cmd[1]), int.Parse(cmd[2]), cmd[3][0]);
canvas.render();
break;
}
}
}
}

Please copy/paste and run it.

Where 4 is for Width and 2 is for height

I want to display output:
_ _
|     |
|     |
|     |
|_ _ |

I am waiting for your response.
Thanks in Advance