file input

hi all, i'm currently having some difficulty in coding something that shouldn't be so hard. part of the program that i am working on is supposed to read in a number from a file (which would basically be the last line input to it) and add 1 to it. here is the code i am using right now. it might look like i am attempting to do things in an odd way, but i have tried so many different ways before this. i am working in c++.net

int pagenum = 1;
						
//default if no previous values
	StreamReader* read_pnum = new StreamReader(File::Open("pnum.txt", FileMode::OpenOrCreate));	//open stream to read page number file
	if(read_pnum->Peek()>=0)
	{
		String* line;
		while(line = read_pnum->ReadLine())
		{
			if(Int64::Parse(line)){
				pagenum = Int64::Parse(line);
				pagenum++;
			}
		}
	}
	read_pnum->Close();
	StreamWriter* write_pnum = File::AppendText("pnum.txt");
	write_pnum->WriteLine(" ");
	write_pnum->WriteLine(url);
	write_pnum->Write(pagenum);
	write_pnum->Close();

so basically, what this code is supposed to do is if the file is empty, output a web page address to a file followed by the number 1 (which is supposed to be the page number). if there are other pages stored in the file, then get the last number in the file, add 1 to it, and output the page address and the new page number to a file. Unfortunately, nothing I have tried in this block works; it won't convert my page number to an integer i don't think. Any help with this would be greatly appreciated!! Thanks