CSL_Test__1.DirectoryHandler.GetHTMLLookUp C# (CSharp) Method

        public static string GetHTMLLookUp(string value)
        {
            ErrorWindow ew = new ErrorWindow();
            StreamReader sr = null;

            string[] ab = new string[2];
            string a;
            string b;
            int c = 0;
            string[] lines = null;
            string replace;

            if (value == null)
                return value;
            try
            {
                sr = new StreamReader(System.Windows.Forms.Application.StartupPath + @"\HTML-Look-Up.txt");

                while (!sr.EndOfStream)
                {
                    ab = sr.ReadLine().Split(' ');
                    a = ab[0];
                    b = ab[1];

                    if (value.Contains(a) || value.Contains(b))
                    {
                        while (value.Contains(a))
                        {
                            replace = sr.ReadLine();
                            value = value.Replace(a, replace);
                        }
                        while (value.Contains(b))
                        {
                            replace = sr.ReadLine();
                            value = value.Replace(b, replace);
                        }
                    }
                    else
                    {
                        sr.ReadLine();
                    }
                }
            }
            catch (FileNotFoundException)
            {
                ew.IssueGeneralWarning("HTML replacing will not occur", "Could not find HTML-Look-Up.txt...", null);
            }
            catch (Exception e)
            {
                ew.IssueGeneralWarning("Error..", lines[c], e.Message);
            }
            finally
            {
                if (sr != null)
                    sr.Dispose();
            }

            return value;
        }