c# how do I count lines in a textfile

Question

any problems with doing this?

int  i = new StreamReader(\"file.txt\").ReadToEnd().Split(new char[] {\'\\n\'}).Length

Answer 1

Mayby this?

string file = new StreamReader("YourFile.txt").ReadToEnd();
string[] lines = file.Split('\n');
int countOfLines = lines.GetLength(0));