Ввод данных с помощью клавиатуры в PostgreSQL

 private void button1_Click(object sender, EventArgs e)
        {
            NpgsqlConnection conn = new NpgsqlConnection("Server = localhost;Port = 5432; Database = postgres; username = postgres; Password=01234567;");
            
            conn.Open();
            NpgsqlCommand comm = new NpgsqlCommand();
            comm.Connection = conn;
        
            NpgsqlCommand cmd1 = new NpgsqlCommand("insert into post_worker values (post)",conn);
        //NpgsqlDataAdapter da = new NpgsqlDataAdapter(sql, conn); 
       //     cmd1.Parameters.Add(new NpgsqlParameter("post", textBox1.Text));
            cmd1.Parameters.Add(new NpgsqlParameter("post", textBox2.Text));
          
            cmd1.ExecuteNonQuery();
        }

  using (NpgsqlConnection conn = new NpgsqlConnection("Server = localhost;Port = 5432; Database = postgres; username = postgres; Password=01234567;"))
 {
     using (NpgsqlCommand cmd1 = new NpgsqlCommand("insert into post_worker(post) values (@post)", conn))
     {
         cmd1.Parameters.AddWithValue("@post", textBox2.Text);
         cmd1.ExecuteNonQuery();
     }
 }

System.Data.SqlClient.SqlConnection sqlConnection1 = 
    new System.Data.SqlClient.SqlConnection("YOUR CONNECTION STRING");
 
System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = "INSERT Region (RegionID, RegionDescription) VALUES (5, 'NorthWestern')";
cmd.Connection = sqlConnection1;
 
sqlConnection1.Open();
cmd.ExecuteNonQuery();
sqlConnection1.Close();

  using (NpgsqlConnection conn = new NpgsqlConnection("Server = localhost;Port = 5432; Database = postgres; username = postgres; Password=01234567;"))
  {
      using (NpgsqlCommand cmd1 = new NpgsqlCommand("insert into post_worker(post) values (@post)", conn))
      {
          cmd1.Parameters.AddWithValue("@post", textBox2.Text);
 
          conn.Open();
 
          cmd1.ExecuteNonQuery();
      }
  }