Reading C# Form data through Serial Port

I'm getting an error everytime I try connecting to the COM5 in my ELEGOO UNO R3.
I try sending data using a C# Form Framework through a button that prints 1 into the serial port.
Objective: The data is readed by an Arduino code that interpreates the data for later using it.
I try verifying by printing "one recieved"
Problem: Either says the port is busy or straight up doesn't connect.
Arduino code:

// VAR //
int ACT;
// SETUP //
void setup() 
{
  Serial.begin(9600);
  Serial.println("Arduino Ready");
}
// PROGRAM //
void loop() 
{  
  if(Serial.available() > 0)  
  {
    ACT= Serial.parseInt();     
    switch(ACT) 
    { 
      case 1:
      Serial.println("One recieved");
      break;
      
      case 2:
      Serial.println("Two recieved");
      break;  
   }   
  }
  delay(50);
}

C# Form1.cs code:

using System;
using System.Windows.Forms;
using System.IO.Ports;

namespace gui2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            serialPort1.Open();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }
        private void uno_Click(object sender, EventArgs e)
        {
            serialPort1.Write("1");
        }

        private void dos_Click(object sender, EventArgs e)
        {
            serialPort1.Write("2");
        }
    }
}

I can run the arduino or the C# programs separately but when trying to have both so try to catch the sent information this error shows (Arduino opened first):
System.UnauthorizedAccessException: 'Se ha denegado el acceso al puerto 'COM5'.'
Or this (C# program opened first):
El Sketch usa 2090 bytes (6%) del espacio de almacenamiento de programa. El máximo es 32256 bytes.
Las variables Globales usan 228 bytes (11%) de la memoria dinámica, dejando 1820 bytes para las variables locales. El máximo es 2048 bytes.
avrdude: ser_open(): can't open device "\.\COM5": Acceso denegado.

Failed uploading: uploading error: exit status 1

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