According to new question, here is the answer:
StreamWriter outputFileTwoo = new StreamWriter(resultatsTwoo);
List <string> firstListThatIcantRevealItName= new List<string>();
List <string> secondListThatIcantRevealItName= new List<string>();
firstListThatIcantRevealItName=System.IO.File.ReadAllLines(@"C:\Users\me\Desktop\blabla.txt").ToList();
secondListThatIcantRevealItName=System.IO.File.ReadAllLines(@"C:\Users\me\Desktop\potto.txt").ToList();
using(StreamWriter outputFileOne = new StreamWriter(resultatsOne))
{
foreach (string trade in secondListThatIcantRevealItName)
{
endofFile++;
if (!secondListThatIcantRevealItName.Contains(trade))
{
outputFileOne.WriteLine("Trade number : " + trade + " exist in first list but not in second list ");
}
if(endofFile==i)
{
outputFileOne.WriteLine(endofFile);
}
}
}
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solved Writing to txt file reach out of memory ? C# [closed]