How to open Word Document in Asp.net c# - Web Application only?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace OpenWordDocumentInASPNetApp {
  public partial class _Default : System.Web.UI.Page {
    protected void Page_Load(object sender, EventArgs e) {
      OpenFileStreamAtClient(Server.MapPath("~") + "\\ABC.docx");
    }


    private void OpenFileStreamAtClient(string filepath) {
      System.IO.Stream fileStream = null;

      // Buffer to read 10K bytes in chunk:
      byte[] byteToReadWriteFromToFile = new byte[10001];

      // Length of the file:
      int lengthOfData = 0;

      // Total bytes to read:
      long dataToRead = 0;

      // Identify the file name without whole page path.
      string filename = System.IO.Path.GetFileName(filepath);

      try {
        // Open the file.
        fileStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);

        // Total bytes to read:
        dataToRead = fileStream.Length;
        Response.Buffer = true;
        Response.BufferOutput = false;
        Response.ContentType = "application/vnd.msword.document.12";
        Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
        Response.AddHeader("Content-Length", dataToRead.ToString());

        // Read the bytes.
        while(dataToRead > 0) {
          // Verify that the client is connected.
          if(Response.IsClientConnected) {
            // Read the data in buffer
            lengthOfData = fileStream.Read(byteToReadWriteFromToFile, 0, 10000);

            // Write the data to the current output stream.
            Response.OutputStream.Write(byteToReadWriteFromToFile, 0, lengthOfData);

            // Flush the data to the HTML output.
            Response.Flush();

            byteToReadWriteFromToFile = new byte[10001];
            // Clear the buffer
            dataToRead = dataToRead - lengthOfData;
          }
          else {
            //prevent infinite loop if user disconnects
            dataToRead = -1;
          }
        }

      }
      catch(Exception) {
      }
      finally {
        if(fileStream != null)
          // Close the file.
          fileStream.Close();
      }

    }

  }
}

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