Read And Write Text in text file in asp.net using C sharp



try
        {
            StringBuilder obj1 = new StringBuilder();
            string sCon = string.Empty;

            string scon1 = string.Empty;

            using (StreamReader sr = new StreamReader("file path" + "file name"))
            {
                sCon = sr.ReadToEnd();
            }
            obj1.Append(sCon.Substring(0, sCon.IndexOf("#spoint") + 11) + Environment.NewLine);
            int startpoint = sCon.IndexOf("#spoint") + 11;
            int endpoint = sCon.IndexOf("#epoint");
            string Test = sCon.Substring(startpoint, endpoint - startpoint);
            if (Test.IndexOf("line Name ") > -1)
            {
                obj1.Append(Test);

            }
            obj1.Append("New string append" + Environment.NewLine);

            obj1.Append(sCon.Substring(sCon.IndexOf("#epoint")) + Environment.NewLine);
            scon2 = obj1.ToString();
           

            FileStream fsPattern = File.OpenWrite("file path" + "file name");
            Encoding encPattern = Encoding.ASCII;
            byte[] restPattern = encPattern.GetBytes(obj1.ToString());
            fsPattern.Write(restPattern, 0, objPattern.Length);
            fsPattern.Flush();
            fsPattern.Close();
            fsPattern.Dispose();
        }
        catch (Exception ex)
        {

        }

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