Collisions in game snake c #

I'm doing the snake game in c #, and the collisions with the walls and with the snake itself are giving me problems, this is the whole code that I've been up to now:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Cuc
{
    class Program
    {
        public struct Coords
        {
            public int cXanelles;
        }
        public struct CoordsCuc
        {
            public int cX, cY;
            public char direcció;
            public int llargada;
        }

        public struct fruita
        {
            public int x, y, durada, augment, valorNutritiu;
        }

        static void Main(string[] args)
        {
            bool colisio = false;
            bool final = false;
            int Augment = 0;
            int duradafalsa = 0;
            int[] cucx = new int[1800];
            int[] cucy = new int[1800];


            CoordsCuc cuc = new CoordsCuc();
            cuc.cX = 37;
            cuc.cY = 12;
            cuc.llargada = 4;

            Coords body = new Coords();
            body.cXanelles = 37;

            CoordsCuc Direccions;
            Direccions.direcció = 'W';
            ConsoleKeyInfo cki;

            fruita Fruita = new fruita();
            Fruita.durada = 0;
            Fruita.valorNutritiu = 9;
            Fruita.x = 0;
            Fruita.y = 0;

            pintaMarc();

            PintarCuc1rPosicio(ref body.cXanelles, ref cucx, ref cucy, ref cuc);

            while (!final)
            {
                if (Console.KeyAvailable)
                {
                    cki = Console.ReadKey();
                    if (cki.Key == ConsoleKey.LeftArrow)
                    {
                        Direccions.direcció = 'W';
                    }
                    if (cki.Key == ConsoleKey.RightArrow)
                    {
                        Direccions.direcció = 'E';
                    }
                    if (cki.Key == ConsoleKey.UpArrow)
                    {
                        Direccions.direcció = 'N';
                    }
                    if (cki.Key == ConsoleKey.DownArrow)
                    {
                        Direccions.direcció = 'S';
                    }
                    if (cki.Key == ConsoleKey.Escape)
                    {
                        final = true;
                    }

                }
                while (Fruita.durada == 0)
                {
                    PosarFruita(ref Fruita, ref cuc, ref duradafalsa, ref cucx, ref cucy);
                }

                PodrirFruita(ref Augment, ref Fruita, ref cuc, ref duradafalsa, ref cucx, ref cucy);

                MovimentCUC(ref Augment, ref cucx, ref cucy, ref cuc, ref Direccions.direcció);

                colisio = Colisions(ref cuc, ref cucx, ref cucy);

                if (!colisio)
                {
                    final = true;
                }

                System.Threading.Thread.Sleep(150);

            }

        }
        public static void pintaMarc()
        {

            Console.SetCursorPosition(1, 2);
            Console.WriteLine("╔");
            Console.SetCursorPosition(75, 2);
            Console.WriteLine("╗");
            Console.SetCursorPosition(75, 25);
            Console.WriteLine("╝");
            Console.SetCursorPosition(1, 25);
            Console.WriteLine("╚");

            for (int x = 2; x < 75; x++)
            {
                Console.SetCursorPosition(x, 2);
                Console.WriteLine("═");
            }
            for (int x = 2; x < 75; x++)
            {
                Console.SetCursorPosition(x, 25);
                Console.WriteLine("═");
            }
            for (int y = 3; y < 25; y++)
            {
                Console.SetCursorPosition(1, y);
                Console.WriteLine("║");
                Console.SetCursorPosition(75, y);
                Console.WriteLine("║");
            }
        }
        public static void PintarCuc1rPosicio(ref int cXanelles, ref int[] cucx, ref int[] cucy, ref CoordsCuc cuc)
        {
            Console.SetCursorPosition(cuc.cX, cuc.cY);
            Console.WriteLine("☻");

            for (int x = 0; x < cuc.llargada; x++)
            {
                cXanelles = cXanelles + 1;
                Console.SetCursorPosition(cXanelles, cuc.cY);
                Console.WriteLine("█");
                cucx[x] = cXanelles;
                cucy[x] = cuc.cY;
            }

        }
        public static void MovimentCUC(ref int Augment, ref int[] cucx, ref int[] cucy, ref CoordsCuc cuc, ref char direcció)
        {

            if (Augment != 0)
            {
                cuc.llargada++;
                Augment--;
            }
            for (int x = cuc.llargada; x > 0; x--)
            {

                cucx[x] = cucx[x - 1];
                cucy[x] = cucy[x - 1];
            }
            cucx[0] = cuc.cX;
            cucy[0] = cuc.cY;
            if (direcció == 'W')
            {
                Console.SetCursorPosition(cuc.cX, cuc.cY);
                Console.WriteLine("█");
                cuc.cX--;
                Console.SetCursorPosition(cuc.cX, cuc.cY);
                Console.WriteLine("☻");

            }
            if (direcció == 'E')
            {
                Console.SetCursorPosition(cuc.cX, cuc.cY);
                Console.WriteLine("█");
                cuc.cX++;
                Console.SetCursorPosition(cuc.cX, cuc.cY);
                Console.WriteLine("☻");
            }
            if (direcció == 'N')
            {
                Console.SetCursorPosition(cuc.cX, cuc.cY);
                Console.WriteLine("█");
                cuc.cY--;
                Console.SetCursorPosition(cuc.cX, cuc.cY);
                Console.WriteLine("☻");
            }
            if (direcció == 'S')
            {
                Console.SetCursorPosition(cuc.cX, cuc.cY);
                Console.WriteLine("█");
                cuc.cY++;
                Console.SetCursorPosition(cuc.cX, cuc.cY);
                Console.WriteLine("☻");
            }

            Console.SetCursorPosition(cucx[cuc.llargada], cucy[cuc.llargada]);
            Console.WriteLine(" ");

            for (int x = 0; x < cuc.llargada; x++)
            {
                Console.SetCursorPosition(cucx[x], cucy[x]);
                Console.WriteLine("█");
            }
        }
        public static bool Colisionsf(ref CoordsCuc cuc, ref fruita fruita, ref int[] cucx, ref int[] cucy)
        {
            bool minitruex = false;
            bool minitruey = false;
            //Fruita
            if (fruita.x == cuc.cX & fruita.y == cuc.cY)
            {
                return false;
            }
            for (int i = 0; i < cuc.llargada; i++)
            {
                if (fruita.x == cucx[i])
                {
                    minitruex = true;
                }
                if (fruita.y == cucy[i])
                {
                    minitruey = true;
                }
                if (minitruex == minitruey & minitruex)
                {
                    return false;
                }
            }
            return true;

        }
        public static bool Colisions(ref CoordsCuc cuc, ref int[] cucx, ref int[] cucy)
        {
            bool colisio = false;

            //Colisio Parets
            if (74 == cuc.cX || 25 == cuc.cY || 2 == cuc.cX || 2 == cuc.cY)
            {
                return false;
            }
            //Colisio Cos
            for (int i = 0; i < cuc.llargada; i++)
            {
                if (cuc.cX == cucx[i])
                {
                    colisio = true;
                    break;
                }
                if (cuc.cY == cucy[i])
                {
                    colisio = true;
                    break;
                }
                else
                {
                    return false;
                }
            }

            return colisio;

        }

        public static void PosarFruita(ref fruita fruita, ref CoordsCuc cuc, ref int duradafruita, ref int[] cucx, ref int[] cucy)
        {
            bool Comprovaciocolisio = false;
            Random rnd = new Random();

            while (!Comprovaciocolisio)
            {
                fruita.x = rnd.Next(2, 75);
                fruita.y = rnd.Next(3, 25);
                Comprovaciocolisio = Colisionsf(ref cuc, ref fruita, ref cucx, ref cucy);
            }

            fruita.valorNutritiu = 9;
            fruita.durada = 60;
            duradafruita = fruita.durada;

            //return;

        }

        public static void PodrirFruita(ref int Augment, ref fruita fruita, ref CoordsCuc cuc, ref int duradafruita, ref int[] cucx, ref int[] cucy)
        {

            if ((cuc.cX == fruita.x) & (cuc.cY == fruita.y))
            {
                Augment = Augment + fruita.valorNutritiu;
                PosarFruita(ref fruita, ref cuc, ref duradafruita, ref cucx, ref cucy);
            }

            else
            {
                Console.SetCursorPosition(fruita.x, fruita.y);
                Console.WriteLine(fruita.valorNutritiu);
                duradafruita--;

                if (duradafruita == (fruita.durada - 6))
                {

                    fruita.durada = fruita.durada - 6;
                    fruita.valorNutritiu--;

                    if (duradafruita == 0)
                    {
                        Console.SetCursorPosition(fruita.x, fruita.y);
                        Console.WriteLine(" ");
                    }
                }
            }
            //return;
        }

    }
}

Ok, I think the main problem I have here:

public static bool Colisions(ref CoordsCuc cuc, ref int[] cucx, ref int[] cucy)
{
    bool colisio = false;

    //Colisio Parets
    if (74 == cuc.cX || 25 == cuc.cY || 2 == cuc.cX || 2 == cuc.cY)
    {
        return false;
    }
    //Colisio Cos
    for (int i = 0; i < cuc.llargada; i++)
    {
        if (cuc.cX == cucx[i])
        {
            colisio = true;
            break;
        }
        if (cuc.cY == cucy[i])
        {
            colisio = true;
            break;
        }
        else
        {
            return false;
        }
    }

    return colisio;

}

Here I have mainly two problems, when pulling to the left and hitting the wall, it makes a block earlier than it should, not like in the other walls that seems to get to eat a block. And the last problem, is that the snake does not collide with itself and that is because I think it does not properly enter the if of the last function cited. Let's see if anyone can help me, thank you very much.

By the way, I think I fail a bit to have two arrays declared in main ... If someone sees some way to improve the code that leaves it out there too, again thanks and best regards!