Insert Update Delete and View Data From SQL Server Database in C#.NET[With Source Code]

Watch the designing part in video!
 Connection Class Code:

       
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
using System.Data;

namespace projectincsharp
{
    class Connection
    {
        SqlConnection con = new SqlConnection("Data Source=RAN-PC;Initial Catalog=projectincsharp;User ID=sa;Password=interrupt");
        public SqlConnection active()
        {
            if(con.State==ConnectionState.Closed)
            {
                con.Open();
            }
            return con;
        }
       
    }
}



       

Source Code of the program!

       

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

        private void btnInsert_Click(object sender, EventArgs e)
        {
            if (validate())
            {
                Connection con = new Connection();
                SqlCommand cmd = new SqlCommand(@"INSERT INTO [dbo].[project]
           ([Name]
           ,[Address]
           ,[Email])
     VALUES
           ('" + txtName.Text + "', '" + txtAdd.Text + "', '" + txtEmail.Text + "')", con.active());
                cmd.ExecuteNonQuery();
                //cmd.EndExecuteNonQuery();
                MessageBox.Show("successfully", "insert", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                MessageBox.Show("error", "insert", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }
        bool validate()
        {
            bool returnval = true;
            if(txtName.Text.Length==0)
            {
                returnval = false;
            }
            if(txtAdd.Text.Length==0)
                {
                returnval = false;
                 }
            if(txtEmail.Text.Length==0)
            {
                returnval = false;
            }
            return returnval;

        }
        private void btnDelete_Click(object sender, EventArgs e)
        {
            Connection con = new Connection();
            SqlCommand cmd = new SqlCommand(@"DELETE FROM [dbo].[project] WHERE [Roll No] = '" + txtRoll.Text + "'",con.active());
            cmd.ExecuteNonQuery();
            MessageBox.Show("successfull", "delete", MessageBoxButtons.OK, MessageBoxIcon.Information);
            txtRoll.Clear();
            txtName.Clear();
            txtAdd.Clear();
            txtEmail.Clear();

               
        }

        private void btnUpdate_Click(object sender, EventArgs e)
        {
            Connection con = new Connection();
            SqlCommand cmd = new SqlCommand(@"UPDATE [dbo].[project]
   SET [Name] = '" + txtName.Text + "',[Address] = '" + txtAdd.Text + "',[Email] = '" +txtEmail.Text+"' WHERE [Roll No] ='" + txtRoll.Text + "'", con.active());
            cmd.ExecuteNonQuery();
            MessageBox.Show("successful", "update", MessageBoxButtons.OK, MessageBoxIcon.Information);


        }

        private void btnNew_Click(object sender, EventArgs e)
        {
            txtAdd.Clear();
            txtEmail.Clear();
            txtRoll.Clear();
            txtName.Clear();
            txtName.Focus();

        }
        void GridView()
        {
            Connection con = new Connection();
            SqlDataAdapter sda = new SqlDataAdapter("select * from project", con.active());
            DataTable dt = new DataTable();
            sda.Fill(dt);
            dataGridView1.Rows.Clear();
            foreach(DataRow item in dt.Rows)
            {
                int n = dataGridView1.Rows.Add();
                dataGridView1.Rows[n].Cells[0].Value = item["Roll No"].ToString();
                dataGridView1.Rows[n].Cells[1].Value = item["Name"].ToString();
                dataGridView1.Rows[n].Cells[2].Value = item["Address"].ToString();
                dataGridView1.Rows[n].Cells[3].Value = item["Email"].ToString();
            }
            

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            GridView();
        }

        private void dataGridView1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            int n = dataGridView1.SelectedRows[0].Index;
            txtRoll.Text = dataGridView1.Rows[n].Cells[0].Value.ToString();
            txtName.Text = dataGridView1.Rows[n].Cells[1].Value.ToString();
            txtAdd.Text = dataGridView1.Rows[n].Cells[2].Value.ToString();
            txtEmail.Text = dataGridView1.Rows[n].Cells[3].Value.ToString();

        }
        void fillListBox()
        {
            string query = "select * from project";
            Connection con = new Connection();
            SqlCommand cmd = new SqlCommand(query, con.active());
            SqlDataReader myreader;
            try
            {
                con.active();
                myreader = cmd.ExecuteReader();
                while(myreader.Read())
                {
                    string sname = myreader.GetString(1);
                    listBox1.Items.Add(sname);
                }
            } catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            Connection con = new Connection();
            string sql = "select * from project where name ='" + listBox1.Text + "';";
            SqlCommand cmd = new SqlCommand(sql, con.active());
            SqlDataReader myreader;
                try
            {
                con.active();
                myreader = cmd.ExecuteReader();
                while(myreader.Read())
                {
                    string rollno = myreader.GetInt32(0).ToString();
                    string name = myreader.GetString(1);
                    string address= myreader.GetString(2);
                    string email = myreader.GetString(3);
                    txtRoll.Text = rollno;
                    txtName.Text = name;
                    txtAdd.Text = address;
                    txtEmail.Text = email;
                }
                
            }catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}



       
 

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