Not replacing string

[Phil++]

Hey, I have a function that replaces a string within a file:

public static void WebPage(int gradeA, int gradeB, int gradeC, int gradeD, int gradeE, int gradeF)
{
    // read the HTML file
   TextReader webpage = new StreamReader ("/Users/Desktop/Assignment/webpage.html");
   string LookUp;
			
   while ((LookUp = webpage.ReadLine()) != null)
   { 
	  string replace = "var grade1 = \"\"";
	  string replaceWITH = "var grade1 = \"" + gradeA + "\"";
				
	  string str = LookUp.Replace (replace, replaceWITH);
				
				
   }
}

But it doesn't write to the file? But it will display on console window? I have tried to include the TextWriter function but it will just clear the whole HTML.

Any ideas?

[Momerath]

It doesn't write to the file because you have no write statement in there anywhere. You'll need to open another file and write out each of the lines your read in.

[apines]

Your code is reading the line, replaces the string, but doesn't write the new string back into the file. Half way there :)