How to split a large .txt file into 2 based on delimeter (|) count .

I’d use Streams for this if the input file is large. You will need a StreamReader and two StreamWriters. Put them inside a using statement so they are closed properly when they go out of scope. Something like this.

const string path = @"C:\temp\Test.txt";
const string pathA = @"C:\temp\testA.txt";
const string pathB = @"C:\temp\testB.txt";
try
{
    using (var streamOutA = new StreamWriter(pathA))
    using (var streamOutB = new StreamWriter(pathB))
    using (var streamReader = new StreamReader(path))
    {
        while (streamReader.Peek() >= 0)
        {
            string line = streamReader.ReadLine();
            if ((line.Count(c => c == '|') > 60))
            {
                streamOutA.WriteLine(line);
            }
            else
            {
                streamOutB.WriteLine(line);
            }
        }
    }
 }
catch (Exception e)
{
    Console.WriteLine("File Exception thrown {0} ", e.Message);
}