private IEnumerable<string[]> LoadFile(string delim, StreamReader sr)
{
    while (sr.Peek() != -1)
        yield return sr.ReadLine().Split(delim.ToCharArray());
}

Norbert;Eder;Irgendeine Strasse 1;10000;Irgendein Ort
Klaus;Mustermann;Mustermann Strasse 1;10000;Irgendein Ort

if (File.Exists("Adressen.txt"))
{
    StreamReader sr = new StreamReader("Adressen.txt");

    var addressList = from field in LoadFile(";", sr)
                      select new
                          {
                              Firstname = field[0],
                              Lastname = field[1],
                              Street = field[2],
                              PostalCode = field[3],
                              City = field[4],
                          };

    List<object> tempList = new List<object>();
    foreach (var address in addressList)
        tempList.Add(address);

    this.DataGridView.DataSource = tempList;                
}

private IEnumerable<string[]> LoadFile(string delim, StreamReader sr)
{
    while (sr.Peek() != -1)
        yield return sr.ReadLine().Split(delim.ToCharArray());
}

private void TestFunction()
{
    StreamReader sr = new StreamReader("Test.cvs");
    foreach (string[] s in LoadFile(";", sr))
    {
        Console.WriteLine(s[0]);
    }
    sr.Close();
}

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