q C# Connection database and data fetch
C# Connection database and data fetch

C# Connection database and data fetch

using Microsoft.Data.SqlClient;
using System;
using System.Data;
using System.Windows.Forms;


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

        private void Form1_Load(object sender, EventArgs e)
        {
            string ConnectionString = "Data Source=WIZARD;Initial Catalog=ISMT;Integrated Security=True;Trust Server Certificate=True";

            SqlConnection sqlConnection = new SqlConnection(ConnectionString);

            string query = "SELECT * FROM Department";

            SqlCommand sql = new SqlCommand(query, sqlConnection);

            sqlConnection.Open();

            SqlDataAdapter adapter = new SqlDataAdapter(query, sqlConnection);
            DataTable dataTable = new DataTable();

            adapter.Fill(dataTable); 

            dataGridView1.DataSource = dataTable; 
        }

       

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }
    }
}
 

void Insert() 
{
    string ConnectionString = "Data Source=WIZARD;Initial Catalog=ISMT;Integrated Security=True;Trust Server Certificate=True";

    SqlConnection sqlConnection = new SqlConnection(ConnectionString);

    string query = "INSERT INTO Department(Id, Name) VALUES(1, 'IT')";

    SqlCommand sql = new SqlCommand(query, sqlConnection);

    sqlConnection.Open();

    int RowsAffected = sql.ExecuteNonQuery();

    if (RowsAffected > 0)
    {
        MessageBox.Show("Added");
    }
}

 

 

 

 

///////////////
PostgreSQL Load Data

 

private string connString = "Host=localhost;Port=5432;Username=postgres;Password=123456;Database=test";

  • using (var conn = new NpgsqlConnection(connString))
  •             {
  •                 conn.Open();
  •                 using (var cmd = new NpgsqlCommand("SELECT * FROM people", conn))
  •                 {
  •                     var dt = new DataTable();
  •                     dt.Load(cmd.ExecuteReader());
  •                     dataGridView1.DataSource = dt;
  •                 }
  •             }