we need that text file convert into integer for example 
cint(Textbox1.text)..

string OpenPath, contents;
            int tabSize = 4;
            string[] arInfo;
            string line;
            DataTable table = CreateTable();
            DataRow row;
            try
            {

                OpenPath = Server.MapPath(".") + @"\My
File.log";
                string FILENAME = OpenPath;
                //Get a StreamReader class that can be used
to read the file
                StreamReader objStreamReader;
                objStreamReader = File.OpenText(FILENAME);
                while ((line = objStreamReader.ReadLine())
!= null)
                {
                    contents =
line.Replace(("").PadRight(tabSize, ' '), "\t");


                    // define which character is seperating
fields
                    char[] textdelimiter = { ']' };

                    arInfo = contents.Split(textdelimiter);
                    for (int i = 0; i <= arInfo.Length; i++)
                    {
                        row = table.NewRow();
                        if (i < arInfo.Length)
                            row["Type"] =
arInfo[i].ToString().Replace("[", " ");

                        if (i + 1 < arInfo.Length)
                            row["Source"] = arInfo[i +
1].ToString().Replace("[", " ");
                        if (i + 2 < arInfo.Length)
                            row["Time"] = arInfo[i +
2].ToString().Substring(1);
                        if (i + 3 < arInfo.Length)
                        {
                            row["Description"] = arInfo[i +
3].ToString().Replace("[", " ");
                            table.Rows.Add(row);
                        }
                        i = i + 2;
                    }
                }