Where the problem in here ?

char E=0x45;
char text[16];
char x,i;
void main()
{
trisb=0;
portb=0;
UART1_Init(9600);
i=0;
while(1){
      if(UART1_Data_Ready()){
      text[i]= UART1_Read();
      i++;
      if(i==16){
          i=0;
for(x=0;x<16;x++)
                 {
                 portb.f0=text[x];
                 portb.f1=0;portb.f1=1;
                 }

portb.f2=0;portb.f2=1;}
}
if(portb.f3==1)
    Uart1_Write(E);
}
}

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;
using System.IO.Ports;

namespace The_control
{
    public partial class Form1 : Form
    {
        SerialPort port;
        public Form1()
        {
            
            InitializeComponent();
            string[] ports = SerialPort.GetPortNames();
            foreach (string port1 in ports)
            {
                coms.Items.Add(port1);
            }
            

        }
        public String convBoolToString(bool[] a)
        {
            string s = null;
            foreach (bool l in a)
            {
                if (l == true) { s = 1 + s; }
                else s = 0 + s;

            }
            return s;
        }
                    

        private void button2_Click(object sender, EventArgs e)
        {
            button1.Enabled = true;
            c.Enabled = true;
            button2.Enabled = false;
            port = new SerialPort(coms.Text, 9600, Parity.None, 8, StopBits.One);
            if (port.IsOpen) port.Close();
            try
            {
                //open serial port
                port.Open();
            }
            catch (System.Exception )
            {
                if (port.IsOpen) port.Close();
            }
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            
            int i;
            bool[] m = new bool[16];
            for (i = 0; i < c.Items.Count  ; i++)
            {
                m[i] = c.GetItemChecked(i);

            }
            //***************************************
     //  MessageBox.Show(convBoolToString(m));
            port.Write(convBoolToString(m));
            port.DataReceived += new SerialDataReceivedEventHandler(serialPort1_DataReceived);
        }



        private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {

            string m;
            m = port.ReadExisting();
            if (m == "E")
            {

                label1.Text = "     FIRE!!!    ";
                label1.BackColor = Color.Red;



            }

        }