save csv file in database

Question

Hello and hi, why this got does not execute if condition ? it goes straight to else even though the file name already in database. I need to do if the csv file name already save in database, it will print out file exist. please help me

foreach(FileInfo file in filess) {
  DateTime lastWriteTime = file.LastWriteTime;

  Console.WriteLine("File list : " + file);
  Console.WriteLine("Time last Edit : " + lastWriteTime);

  if (File.Exists("file")) {
    Console.WriteLine("File Name Exist!");
    var sel = "select * from listfile where filename = @filename";
    var cmd2 = new NpgsqlCommand(sel, conn);
    conn.Open();

    cmd2.Parameters.AddWithValue("@filename", file);
    Console.WriteLine(file + " exist in database.");
    cmd2.ExecuteNonQuery();
    conn.Close();
  }
  else {
    Console.WriteLine("File Name NOT Exist!");

    var lf = "insert into listfile(filename)values(@filename)";
    var cmd = new NpgsqlCommand(lf, conn);
    conn.Open();

    cmd.Parameters.AddWithValue("filename", Convert.ToString(file));
    string filename1 = cmd.Parameters["@filename"].Value.ToString();
    Console.WriteLine("Record inserted successfully. filename = " + file);

    cmd.ExecuteNonQuery();
    conn.Close();
  }
}