C Sharp. jede zweite Zahl einlesen

 // file
 const string FILE = @"D:\test.txt";  
 // read file
 string strINPUT = System.IO.File.ReadAllLines(FILE);
 // remove parentheses, convert all array elements to real numbers and only leave every second item of the array
 IEnumerable<double> numbers = Array.ConvertAll(strINPUT.Trim(new char { '(', ')' }).Split(new char { ',' }), x => double.Parse(x, System.Globalization.CultureInfo.GetCultureInfo("en-us"))).Where((x,i) => (i+1) % 2 == 0);  
 // FOR-Schleife über die Zahlen
 foreach(double num in numbers) {
     Console.WriteLine(num);
 }
 Console.ReadLine();

 // file
 const string FILE = @"D:\test.txt";  
 // read file
string strINPUT = System.IO.File.ReadAllLines(FILE);
// read first line of file trim parenthesis and split with comma
string numbers = strINPUT.Trim(new char { '(', ')' }).Split(new char { ',' });  
// loop through array starting with second item and 2 step incrementor
for (int i = 1; i < numbers.Length; i+=2) {
    Console.WriteLine(numbers[i]);
}
Console.ReadLine();

 // file
 const string FILE = @"D:\test.txt";  
 // read file
string strINPUT = System.IO.File.ReadAllLines(FILE);
// read first line of file trim parenthesis and split with comma
string numbers = strINPUT.Trim(new char { '(', ')' }).Split(new char { ',' });  
// loop through array starting with second item and 2 step incrementor
for (int i = 0; i < numbers.Length; i++) {
    if ((i+1) % 2 == 0) {
        Console.WriteLine(numbers[i]);
    }
}
Console.ReadLine();