C# IF statement is not excluding strings

Question

So the problem is : I want to read from file and exclude certain strings( i am inexperienced so I decided to use IF so i want to exclude the strings Name, facultyNumber and etc. but it doesn't exclude them for some reason ? (I've tried to remove the spaces from the if statement)

 public void read()
            {
               string[] textes = File.ReadAllLines(@"C:\Users\sashk\Source\Repos\ConsoleApp6\ConsoleApp6\save.txt", Encoding.Default);
                double[] gread = new double[] { 1, 2, 3 };
                List<string> texts = new List<string>();
                int i= 0;
                int z = 0;
                foreach (string text in textes)
                {
                    string[] words = textes[i].Split(' ');
                    for (int j = 0; j < words.Length; j++)
                    {
                        if (!words[j].Equals(" Name: ") || !words[j].Equals(" FacultyNumber: ") || !words[j].Equals(" Grades: ") || !words[j].Equals(" AverageGrade: "))
                        {
                            texts.Add(words[j]);
                        }
                    }
                    //  for (int j = 2; j < texts.Count; j++)
                    //  {
                    //      gread[z] = Convert.ToDouble(texts[j]); 
                    //  }
                    //  addStudent(texts[0], Convert.ToInt32(texts[1]), gread);
                    for (int j = 0; j < 40; j++)
                    {
                        Console.WriteLine(texts[j]);
                    }
                    i++;
                }

The content of the file is this:

> Name: asd FacultyNumber: 2 Grades: 1,23  4,56  7,89   AverageGrade: 4,56
 Name: as FacultyNumber: 4 Grades: 1  5  9   AverageGrade: 5
 Name: ad FacultyNumber: 3 Grades: 2  4  7   AverageGrade: 4,33333333333333
 Name: ddd00 FacultyNumber: 1 Grades: 12  15  99   AverageGrade: 42

Answer 1

You can use Contains like this:

var excluded = new[] { "Name:", "FacultyNumber:", "Grades:", "AverageGrade:" }; 

foreach (string text in textes) 
{
    string[] words = textes[i].Split(' ');
    for (int j = 0; j < words.Length; j++) 
    {
        if (!excluded.Contains(words[j]))
        {
            texts.Add(words[j]);
        }
    }
}

But I think you can do it with LINQ. The code will be much cleaner:

string[] textes = File.ReadAllLines(@"C:\Users\sashk\Source\Repos\ConsoleApp6\ConsoleApp6\save.txt", Encoding.Default);

var excluded = new[] { "Name:", "FacultyNumber:", "Grades:", "AverageGrade:" }; 

var texts = textes.SelectMany(x => x.Split(' ').Where(y => !excluded.Contains(y)));

foreach(string word in texts)
{
    Console.WriteLine(word);
}