How To Repeat Split Method After X Times?

I have a .txt file which I would like to split using the split method. My current code is:

string[] alltext = File.ReadAllText(fullPath).Split(new[] { ',' }, 3);

The problem I now have is that I want it to loop through the whole in a way that it always splits the text into three pieces that belong together. If I have a text with:

testing, testing,  
buenooo diasssss

testing, testing,  
buenooo diasssss

testing, testing,  
buenooo diasssss

(the format here is hard to display, but want to show that they are on different lines, so reading line by line will most likely not be possible)
I want "testing", "testing", "buenooo diasssss" to be dispalyed on my console althought they are on different lines.

If I would do it with lines I would simply loop through each line, but this does not work in this case.

You can first remove "\r\n"(new line) from the text, then split and select the first three items.

var alltext = File.ReadAllText(fullPath).Replace("\r\n","").Split(',').ToList().Take(3);
foreach(var item in alltext)
     Console.WriteLine(item);

Edit

If you want all three items to be displayed in one line in the console:

        int lineNumber = 0;
        var alltext = File.ReadAllText(fullPath).Split(new string[] { "\r\n", "," }, StringSplitOptions.None).ToList();
        alltext.RemoveAll(item => item == "");
        while (lineNumber * 3 < alltext.Count)
        {
            var tempList = alltext.Skip(lineNumber * 3).Take(3).ToList(); ;
            lineNumber++;
            Console.WriteLine("line {0} => {1}, {2}, {3}",lineNumber, tempList[0], tempList[1], tempList[2]);
        }

result:

Try this:

var data =
	File.ReadLines(fullpath)
		.Select((x, n) => (line: x, group: n / 3))
		.GroupBy(x => x.group, x => x.line)
		.Select(x =>
			String
				.Concat(x)
				.Split(',', StringSplitOptions.RemoveEmptyEntries)
				.Select(x => x.Trim()));

That gives me: