C# ช่วยแก้โค้ดที่่ errror ให้หน่อยค่ะ ด่วนมากๆๆๆ โปรแกรมตัดคำภาษาไทย

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 token_passing
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnOK_Click(object sender, EventArgs e)
        {

            dgvOutput.ClearSelection();
        }

            Step Process()
{ 

char *find_text;
Cut_all_text( ); // Cut Sentence
read_all_text.open(input_text);
while(read_all_text) // do all
{
read_all_text.getline(Buffer_text,Maxline);
if (Buffer_text[0] == '\0')
break;
find_text = Buffer_text;
Spell_Checking(find_text);
Search_Sentence( );
//Search correct sentence from word graph
Perplexity(Sentence);
// Language Model
Evaluate(ppx); //find the best sentence
Keep_Correct_Sentence( );
//Keep the best correct sentence
}
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            txtInput.Clear();
            dgvOutput.ClearSelection();
        }

   
        private void dgvOutput_CellContentClick(object sender, DataGridViewCellEventArgs e)

        {

            txtInput.Text = dgvOutput.CurrentRow.Cells["Cus_ID"].Value.ToString();

        }
       
    }