try
            {
                application = new Application();

                /*
                 * application.Workbooks.Open(...は、Workbooksオブジェクトの解放処理ができないので不可。
                 * 必ず変数経由でComRelease.FinalReleaseComObjectsを呼び出すこと。
                 */
                workbooks = application.Workbooks;

                workbook = workbooks.Open(
                    excelFilePathName, Type.Missing, Type.Missing, Type.Missing, Type.Missing
                    , Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing
                    , Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

                // http://msdn.microsoft.com/ja-jp/library/microsoft.office.tools.excel.workbook.exportasfixedformat(v=vs.90).aspx
                workbook.ExportAsFixedFormat(
                    XlFixedFormatType.xlTypePDF,
                    saveAsPathName,
                    XlFixedFormatQuality.xlQualityStandard,
                    true,
                    true,
                    Type.Missing,
                    Type.Missing,
                    false,
                    Type.Missing);
            }
            finally
            {
                if (workbook != null)
                {
                    try
                    {
                        workbook.Close(true, Type.Missing, Type.Missing);
                    }
                    catch
                    {
                    }
                }

                if (application != null)
                {
                    try
                    {
                        application.Quit();
                    }
                    catch
                    {
                    }
                }

                ComRelease.FinalReleaseComObjects(workbook, workbooks, application);
            }
        }
    }

    /// <summary>
    /// COMオブジェクトを解放する機能を提供します。
    /// </summary>
    public static class ComRelease
    {
        /// <summary>
        /// 複数のCOMオブジェクトの参照カウントを０までデクリメントし、解放します。
        /// </summary>
        /// <param name="objects">解放するCOMオブジェクトの配列。</param>
        /// <remarks>解放は配列の要素順に行います。</remarks>
        public static void FinalReleaseComObjects(params object[] objects)
        {
            foreach (object o in objects)
            {
                try
                {
                    if (o == null)
                        continue;
                    if (Marshal.IsComObject(o) == false)
                        continue;
                    Marshal.FinalReleaseComObject(o);
                }
                catch (Exception)
                {
                }
            }
        }
    }

}

  private void button13_Click(object sender, EventArgs e)
        {
            const string Dir = @"C:\";
            ExcelToPdf.SaveAsPdf(Path.Combine(Dir, "20121219163550.xlsx"), Path.Combine(Dir, "20121219163550.pdf"));

        }

    <telerik:RadCodeBlock ID="RadCodeBlock" runat="server">
        <script type="text/javascript">

            function nextButtonMouseOver(sender, args) {

                var index = $get("<%= CurrentIndex.ClientID %>").value;
                PageMethods.GetNextOrPrevious(true, index, onSuccess)
            }

XXX.ｃｓ

http://blog.csdn.net/laolaowhn/article/details/1821886

Asp.net(c#)实现多线程断点续传       

Asp.net(c#)实现多线程断点续传 

 

http://www.cnblogs.com/bestcomy/archive/2004/08/10/31950.html

以前一直错误的认为在ASP.NET中无法通过编程方式实现多线程断点续传，今天终于获得了这样一个解决方案，让我明白要学习的东西还很多。
此解决方案基于其它解决方案及相关资料，根据我自己的理解改进.如有错漏，请尽管指出;如有其它更好的解决方案，请推荐一下，感谢先。

System.IO.Stream iStream = null;

            // Buffer to read 10K bytes in chunk:
            byte[] buffer = new Byte[10240];

            // Length of the file:
            int length;

            // Total bytes to read:
            long dataToRead;

            // Identify the file to download including its path.
            string filepath  = @"E:/software/SQL Server 2000 Personal Edition.ISO";

            // Identify the file name.
            string  filename  = System.IO.Path.GetFileName(filepath);

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

                // Total bytes to read:
                dataToRead = iStream.Length;

                long p = 0;
                if(Request.Headers["Range"]!=null)
                {
                    Response.StatusCode = 206;
                    p = long.Parse( Request.Headers["Range"].Replace("bytes=","").Replace("-",""));
                }
                if(p != 0)
                {
                    Response.AddHeader("Content-Range","bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString());                   
                }
                Response.AddHeader("Content-Length",((long)(dataToRead-p)).ToString());
                Response.ContentType = "application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(Request.ContentEncoding.GetBytes(filename)));

                iStream.Position = p;
                dataToRead = dataToRead - p;
                // Read the bytes.
                while (dataToRead > 0)
                {
                    // Verify that the client is connected.
                    if (Response.IsClientConnected)
                    {
                        // Read the data in buffer.
                        length = iStream.Read(buffer, 0, 10240);

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

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

                        buffer= new Byte[10240];
                        dataToRead = dataToRead - length;
                    }
                    else
                    {
                        //prevent infinite loop if user disconnects
                        dataToRead = -1;
                    }
                }
            }
            catch (Exception ex)
            {
                // Trap the error, if any.
                Response.Write("Error : " + ex.Message);
            }
            finally
            {
                if (iStream != null)
                {
                    //Close the file.
                    iStream.Close();
                }
                   Response.End();
            }

ここでは、 ViewState と Session を比較し、基本的な使い分け方について説明します。

ViewState は、以下の条件にマッチする場合に使用します。

• 画面内だけで利用するデータ
  
• 容量が小さいデータ
  
• セキュリティが必要ないデータ

Session は、以下の条件にマッチする場合に使用します。

• 画面間で受け渡すデータ
  
• セキュリティが必要なデータ