Question

Is there a better way to do this?

foreach (var line in lines)
{
    bool t01 = line.Model.ToLower() == model;
    bool t02 = line.Authority.ToLower() != "unknown";
    bool t101 = line.Type.ToLower() == "adcn";
    bool t102 = line.Type.ToLower() == "adcn/adv";
    bool t103 = line.Type.ToLower() == "bn";
    bool t104 = line.Type.ToLower() == "book";
    bool t105 = line.Type.ToLower() == "cancel";
    bool t106 = line.Type.ToLower() == "cir";
    bool t107 = line.Type.ToLower() == "coord sht";
    bool t108 = line.Type.ToLower() == "cre";
    bool t109 = line.Type.ToLower() == "ddr";
    bool t110 = line.Type.ToLower() == "dl";

    if (t01 && t02)
        if ((t101 || t102 || t103 || t104 || t105 || t106 || t107 || t108 || t109 || t110))
            Console.WriteLine(line);
}

It actually goes up to t139. Clipped it for brevity.

Answer 1

string[] validTypes = new string[] { "adcn", "adcn/adv", "bn", "book" /*, ...*/ };

foreach (var line in lines)
{
    bool t01 = line.Model.ToLower() == model;
    bool t02 = line.Authority.ToLower() != "unknown";

    if(t01 && t02 && validTypes.Contains(line.Type.ToLower())
        Console.WriteLine(line);
}