Example of a StreamReader/StreamWriter in C# to modify a specific line.

readerwriter.cs

using (StreamWriter wStreamWriter = new StreamWriter(wPathTarget))
{
	using (StreamReader wStreamReader = new StreamReader(wPathSource))
	{
	    while ((wLine = wStreamReader.ReadLine()) != null)
	    {
	        if (!wLine.Contains(iPackageName))
	        {
	            wStreamWriter.WriteLine(wLine);
	        }
	    }
	}
}