How to downlload txt file using code

string remoteUri = "http://www.contoso.com/library/homepage/images/";
        string fileName = "ms-banner.gif", myStringWebResource = null;
        // Create a new WebClient instance.
        WebClient myWebClient = new WebClient();
        // Concatenate the domain with the Web resource filename.
        myStringWebResource = remoteUri + fileName;
        Console.WriteLine("Downloading File \"{0}\" from \"{1}\" .......\n\n", fileName, myStringWebResource);
        // Download the Web resource and save it into the current filesystem folder.
        myWebClient.DownloadFile(myStringWebResource,fileName);
        Console.WriteLine("Successfully Downloaded File \"{0}\" from \"{1}\"", fileName, myStringWebResource);
        Console.WriteLine("\nDownloaded file saved in the following file system folder:\n\t" + Application.StartupPath);

public Boolean CreateOutputFile(DataTable dataTable)
       {
           try
           {
               List<String> csvFileColumns = new List<String>();
               csvFileColumns.Add("Column1");
               csvFileColumns.Add("Column2");
               using (StreamWriter streamWriter = new StreamWriter("C:\\data.csv"))
               {
                   // code to write CSV File Header
                   csvFileColumns.ForEach(delegate(String columnName)
                   {
                       streamWriter.Write(columnName);
                       streamWriter.Write(",");
                   });

                   streamWriter.Write(streamWriter.NewLine);
                   //fetch each row
                   if (dataTable.Rows.Count > 0)
                   {
                       foreach (DataRow dataRow in Data.Rows)
                       {

                           csvFileColumns.ForEach(delegate(String columnName)
                               {
                                   String value = String.Empty;
                                   if (value.Equals(String.Empty))
                                   {
                                       if (!dataRow.IsNull(columnName))
                                       {
                                           value = dataRow[columnName].ToString();
                                       }
                                   }
                                   streamWriter.Write(value);
                                   streamWriter.Write(",");
                               });
                           streamWriter.Write(streamWriter.NewLine);
                       }
                   }
               }
           }
           catch (IOException exp)
           {

           }
           return true;
       }