Error 2 expected class, delegate, enum, interface, or struct line 27, 30, 33, 37, 24, 51

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace AddrApp
{
    public partial class Form1 : Form
    {
        SqlConnection con= new SqlConnection(@"Data Source=DESKTOP-5KNSK7E\SQLEXPRESS;Initial Catalog=church;Integrated Security=True");  
        SqlCommand cmd;  
        SqlDataAdapter adapt;  
        //ID variable used in Updating and Deleting Record  
        int ID = 0;  
        public Form1()  
        {  
            InitializeComponent();  
            DisplayData();  
        }
    }
    private void DisplayData()

    {
 	throw new NotImplementedException();
    }  

        private void btn_Insert_Click(object sender, EventArgs e)  
{
            if (txt_name.Text != "" && txt_address.Text != "" && txt_contact.Text != "" && txt_clergy.Text != "" && txt_cantor.Text != "" && txt_charges.Text != "" && txt_picture.Text != "")  
            {  
                cmd = new SqlCommand("insert into church(Name,Address,Contact,Clergy,Cantor,Charges,Picture) values(@Name,@Address,@Contact,@Clergy,@Cantor,@Charges,@Picture)", con);  
                con.Open();  
                cmd.Parameters.AddWithValue("@Name", txt_name.Text);  
                cmd.Parameters.AddWithValue("@Address", txt_address.Text);
                cmd.Parameters.AddWithValue("@Contact", txt_contact.Text);  
                cmd.Parameters.AddWithValue("@Clergy", txt_clergy.Text);
                cmd.Parameters.AddWithValue("@Cantor", txt_cantor.Text);
                cmd.Parameters.AddWithValue("@Charges", txt_charges.Text);  
                cmd.Parameters.AddWithValue("@Picture", txt_picture.Text); 
                cmd.ExecuteNonQuery();  
                con.Close();  
                MessageBox.Show("Record Inserted Successfully");  
                DisplayData();  
                ClearData();  
            }  
            else
            {  
                MessageBox.Show("Please Provide Details!");  
            }  
}
        //Display Data in DataGridView  
        private void DisplayData()  
        {  
            con.Open();  
            DataTable dt=new DataTable();  
            adapt=new SqlDataAdapter("select * from church",con);  
            adapt.Fill(dt);  
            dataGridView1.DataSource = dt;  
            con.Close();  
        }  
        //Clear Data  
        private void ClearData()  
        {  
            txt_name.Text = "";  
            txt_address.Text = "";
            txt_contact.Text = "";  
            txt_clergy.Text = ""; 
            txt_cantor.Text = "";  
            txt_charges.Text = ""; 
            txt_picture.Text = "";  
            ID = 0;  
        }  
        //dataGridView RowHeaderMouseClick Event  
        private void dataGridView1_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)  
        {  
            ID = Convert.ToInt32(dataGridView.Rows[e.RowIndex].Cells[0].Value.ToString());  
            txt_name.Text = dataGridView.Rows[e.RowIndex].Cells[1].Value.ToString();  
            txt_address.Text = dataGridView.Rows[e.RowIndex].Cells[2].Value.ToString();
            txt_contact.Text = dataGridView.Rows[e.RowIndex].Cells[1].Value.ToString();  
            txt_clergy.Text = dataGridView.Rows[e.RowIndex].Cells[2].Value.ToString();  
            txt_cantor.Text = dataGridView.Rows[e.RowIndex].Cells[1].Value.ToString();  
            txt_charges.Text = dataGridView.Rows[e.RowIndex].Cells[2].Value.ToString();   
            txt_picture.Text = dataGridView.Rows[e.RowIndex].Cells[2].Value.ToString();     
        }  
        //Update Record  
        private void btn_Update_Click(object sender, EventArgs e)  
        {  
            if (txt_name.Text != "" && txt_address.Text != "" && txt_contact.Text != "" && txt_clergy.Text != "" && txt_cantor.Text != "" && txt_charges.Text != "" && txt_picture.Text != "")  
            {  
                cmd = new SqlCommand("update church set Name=@Name,Address=@Address,Contact=@Contact,Clergy=@Clergy,Cantor=@Cantor,Charges=@Charges,Picture=@Picture where ID=@ID", con);  
                con.Open();  
                cmd.Parameters.AddWithValue("@ID", ID);  
                cmd.Parameters.AddWithValue("@Name", txt_Name.name);  
                cmd.Parameters.AddWithValue("@Address", txt_address.Text);
                cmd.Parameters.AddWithValue("@Contact", txt_contact.Text);  
                cmd.Parameters.AddWithValue("@Clergy", txt_clergy.Text);  
                cmd.Parameters.AddWithValue("@Cantor", txt_cantor.Text);
                cmd.Parameters.AddWithValue("@Charges", txt_charges.Text);  
                cmd.Parameters.AddWithValue("@Picture", txt_picture.Text); 
                cmd.ExecuteNonQuery();  
                MessageBox.Show("Record Updated Successfully");  
                con.Close();  
                DisplayData();  
                ClearData();  
            }  
            else  
            {  
                MessageBox.Show("Please Select Record to Update");  
            }  
        }  
        //Delete Record  
        private void btn_Delete_Click(object sender, EventArgs e)  
        {  
            if(ID!=0)  
            {  
                cmd = new SqlCommand("delete church where ID=@ID",con);  
                con.Open();  
                cmd.Parameters.AddWithValue("@ID",ID);  
                cmd.ExecuteNonQuery();  
                con.Close();  
                MessageBox.Show("Record Deleted Successfully!");  
                DisplayData();  
                ClearData();  
            }  
            else  
            {  
                MessageBox.Show("Please Select Record to Delete");  
            } 

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}