//ایجاد بانک اطلاعاتی خالی
var dir = @"D:\Prog\"; // این مسیر پوشه است و نه مسیر فایل
using (OleDbConnection connection = new OleDbConnection(@"Provider=VFPOLEDB.1;Data Source=" + dir))
{
    using (var command = new OleDbCommand())
    {
        command.Connection = connection;
        command.Connection.Open();
        command.CommandText = "Create Table myDBF (dsw_id1 int, dsw_fname v(250), dsw_lname v(250) )";
        command.CommandType = CommandType.Text;
        command.ExecuteNonQuery();
    }
}

//ثبت اطلاعات در بانک ایجاد شده
var dbPath = Path.Combine(dir, "myDBF.dbf");
using (OleDbConnection connection = new OleDbConnection(@"Provider=VFPOLEDB.1;Data Source=" + dbPath))
{
    using (var command = new OleDbCommand())
    {
        command.Connection = connection;
        command.Connection.Open();
        command.CommandText = "Insert Into myDBF Values (1, ?, ?)";
        command.Parameters.AddWithValue("?", "B"); // فقط علامت سؤال در اینجا کار می‌کند و نه هیچ چیز دیگری
        command.Parameters.AddWithValue("?", "A");
        command.CommandType = CommandType.Text;
        command.ExecuteNonQuery();
    }
}

using System;
using System.Linq;
 
public class Test
{
public static void Main()
{
var beatles = (new[]
            {
                new {id = 1, inst = "guitar", name = "john"},
                new {id = 2, inst = "guitar", name = "george"},
                new {id = 3, inst = "guitar", name = "paul"},
                new {id = 4, inst = "drums", name = "ringo"},
                new {id = 5, inst = "drums", name = "pete"}
            });
 
            var result = beatles
                .GroupBy(g => g.inst)
                .Select(c => c.OrderBy(o => o.id).Select((v, i) => new { i, v }).ToList())
                .SelectMany(c => c)
                .Select(c => new { c.v.id, c.v.inst, c.v.name, rn = c.i + 1 })
                .ToList();
 
            Console.WriteLine("id | inst \t| name  \t| rn");
            foreach (var row in result)
            {
                Console.WriteLine($"{row.id}  | {row.inst}\t| {row.name}  \t| {row.rn}");
            }     
}
}

id | inst | name  | rn
1  | guitar| john  | 1
2  | guitar| george  | 2
3  | guitar| paul  | 3
4  | drums| ringo  | 1
5  | drums| pete  | 2

psexec \\x.x.x.x -u domain\user -p password cmd

psexec \\192.168.1.16 -u domain\admin -p password cmd

logoff [id# of session to quit] /v

logoff 2 /v