(VERIFICACION DE CADENA) corregido

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace EXAMEN_UIII_2._1__VISUAL_

{

    class Pila

    {

         char[] vec;

            int tam;

            int tope;

            bool vacia, llena;

            public Pila(int tamaño)

            {

                vec = new char[tamaño];

                tam = tamaño;

                tope = 0;

                vacia = true;

                llena = false;

            }

          

 

            public void push(char valor)

            {

                vacia = false;

                vec[tope++] = valor;

                if (tope == tam)

                    llena = true;

            }

            public char pop()

            {

                if (--tope == 0)

                    vacia = true;

                llena = false;

                return vec[tope];

            }

            public bool estavacia

            {

                get

                {

                    return vacia;

                }

            }

            public int Tope

            {

                get { return tope; }

            }

            public int Max

            {

                get { return vec.Length; }

            }

            public bool esta_llena()

            {

                return llena;

            }

            public char this[int index]

            {

                get { return vec[index]; }

            }

        //aqui intente complicarme la vida jajaja xD

            public bool validarbien(string cadena)

            {

                char[] aux = cadena.ToCharArray();

                for (int i = 0; i < cadena.Length; i++)

                {

                    push(aux[i]);

                }

                //validamos

                int con1 = 0, con2 = 0, con3 = 0, con4 = 0, con5 = 0, con6 = 0;

                int j = 0;

                while (!estavacia)

                {

                    aux[j] = pop();

                    if (aux[j] == 40)

                    {

                        con1++;

                    }

                    else

                        if (aux[j] == 41)

                            con2++;

                        else

                            if (aux[j] == 91)

                                con3++;

                            else

                                if (aux[j] == 93)

                                    con4++;

                                else

                                    if (aux[j] == 123)

                                        con5++;

                                    else

                                        if (aux[j] == 125)

                                            con6++;

                    j++;

                }

                if (con1 == con2 && con3 == con4 && con5 == con6)

                    return true;

                else

                    return false;

            }

    }

}

===================================

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace EXAMEN_UIII_2._1__VISUAL_

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void butVerificar_Click(object sender, EventArgs e)

        {

            string cadena = Convert.ToString(textInsertar.Text);

            Pila pila = new Pila(cadena.Length);

            labelResultado.Text=/*"validamos bien : " +*/ Convert.ToString( pila.validarbien(cadena));

        }

    }

}