Insert, Update, Delete, Search In C# Windows Application

How to display contents of DataTable in DataGridView control in Windows Forms Application using C# and VB.Net.

l explain how to display contents of DataTable in DataGridView control in Windows Forms Application using C# and VB.Net.

Code:-

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.Data.SqlClient;
using System.Configuration;

namespace Pavan_Fabrics
{
    public partial class AllCompany : Form
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["admin"].ConnectionString);
        int ID=0;
        public static string SetValueForText1 = "";  
        public AllCompany()
        {
            InitializeComponent();
        }
        private void AllCompany_Load(object sender, EventArgs e)
        {
            kaushik();
        }
        public string acompany = "";
        private void kaushik()
        {
            System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor;
            label1.Text = acompany.ToString();
            try
            {
                if (con.State == ConnectionState.Open)
                {
                    con.Close();
                }
                con.Open();
                SqlCommand cmd = new SqlCommand("Select * from Company_Info", con);
                SqlDataReader dr = cmd.ExecuteReader();
                DataTable dt = new DataTable();
                dt.Load(dr);
                if (dt.Rows.Count > 0)
                {
                    if (con.State == ConnectionState.Open)
                    {
                        con.Close();
                    }
                    con.Open();
                    string selectstr = "select * from dbo.Company_Info";
                    SqlDataAdapter da = new SqlDataAdapter();
                    DataSet ds = new DataSet();
                    da = new SqlDataAdapter(selectstr, con);
                    ds = new DataSet("dbo.Company_Info");

                    da.SelectCommand = new SqlCommand(selectstr, con);
                    ds.Clear();
                    da.Fill(ds, "dbo.Company_Info");
                    dataGridView1.DataSource = ds.Tables["dbo.Company_Info"];
                    dataGridView1.Columns[1].HeaderText = "Code";
                    dataGridView1.Columns[2].HeaderText = "Name";
                    dataGridView1.Columns[3].HeaderText = "Address";
                    dataGridView1.Columns[4].HeaderText = "Date";
                    dataGridView1.Columns[5].HeaderText = "Mobileno";
                    dataGridView1.Columns[6].HeaderText = "Email Id";


                    dataGridView1.Columns[0].Visible = false;
                    dataGridView1.Columns[1].Visible = false;

                    dataGridView1.Columns[2].Width = 140;
                    dataGridView1.Columns[3].Width = 140;
                    dataGridView1.Columns[4].Width = 200;
                    dataGridView1.Columns[5].Width = 175;
                    dataGridView1.Columns[6].Width = 175;
                    dataGridView1.Visible = true;
                    con.Close();
                }
                else
                {
                  
                }
                con.Close();
            }
            catch 
            {
               
            }

        }
        private void button4_Click(object sender, EventArgs e)
        {
            this.Hide();
        }
       
        private void button1_Click(object sender, EventArgs e)
        {
            if (con.State == ConnectionState.Open)
            {
                con.Close();
            }
            con.Open();
            SqlCommand cmd = new SqlCommand("delete Company_Info where Id=@Id", con);
            cmd.Parameters.AddWithValue("@Id", ID);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);


            dataGridView1.DataSource = dt;

            cmd.ExecuteNonQuery();
            kaushik();
            Delete_Successfully ds = new Delete_Successfully();
            ds.ShowDialog();
        }
        private void dataGridView1_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            ID = Convert.ToInt32(dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString());
            label2.Text = dataGridView1.Rows[e.RowIndex].Cells[2].Value.ToString();
            label3.Text = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            SetValueForText1 = ID.ToString();
            this.Hide();
            Company ac = new Company();
            ac.ShowDialog();
        }  
       
    }
}