perform a select in npgsql
using System;
using Npgsql;
class Sample
{
static void Main(string[] args)
{
// Connect to a PostgreSQL database
NpgsqlConnection conn = new NpgsqlConnection("Server=127.0.0.1;User Id=postgres; " +
"Password=pwd;Database=postgres;");
conn.Open();
// Define a query returning a single row result set
NpgsqlCommand command = new NpgsqlCommand("SELECT COUNT(*) FROM cities", conn);
// Execute the query and obtain the value of the first column of the first row
Int64 count = (Int64)command.ExecuteScalar();
Console.Write("{0}\n", count);
conn.Close();
}
}