Using CrystalReport to Export DataTable With Different Format

We can export data inside a DataTable to an Excel spreadsheet by defining the Response.ContentType:

Response.ContentType = "application/vnd.ms-excel";
string separator = "\t";
foreach (DataColumn dc in dataTable.Columns)
{
       Response.Write(separator + dc.ColumnName );
}
Response.Write("\n");
foreach (DataRow dr in dataTable.Rows)
{
       for (int i = 0; i < dataTable.Columns.Count; i++)
       {
              Response.Write(separator + dr[i].ToString());
       }
       Response.Write("\n"); 
}

What if we need more format such as PDF? You can export data to a few other popular formats by using Crystal's ReportDocument if you have Crystal Reports available:

using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
using System.IO;

private void ExportReport()
{
    MemoryStream oStream = new MemoryStream();
    string filename = string.Empty;
    try
    {
        ReportDocument crReport = new ReportDocument();
        string reportFile = "CrystalReport1.rpt";
        string reportPath = string.Format("{0}/{1}", Server.MapPath("."), reportFile);
        crReport.Load(reportPath);

        ReportDataSetTableAdapters.UtilityTableAdapter ad = new ReportDataSetTableAdapters.UtilityTableAdapter();
        ReportDataSet.UtilityDataTable ut = ad.GetAllData();
        crReport.SetDataSource((DataTable)ut);

        switch (SelectedType)
        {
         case "1": //Rich Text (RTF)
             oStream = (MemoryStream)crReport.ExportToStream(ExportFormatType.RichText);
             Response.ContentType = "application/rtf";
             filename = "data.rtf";
             break;
         case "2": //PDF 
             oStream = (MemoryStream)crReport.ExportToStream(ExportFormatType.PortableDocFormat);
             Response.ContentType = "application/pdf";
             filename = "data.pdf";
             //in case you want to export it as an attachment use the line below
             //crReport.ExportToHttpResponse(ExportFormatType.PortableDocFormat, Response, true, "Your Exported File Name"); 
             break;
         case "3": //MS Word (DOC)
             oStream = (MemoryStream)crReport.ExportToStream(ExportFormatType.WordForWindows);
             Response.ContentType = "application/doc";
             filename = "data.doc";
             break;
         case "4": //MS Excel (XLS)
             oStream = (MemoryStream)crReport.ExportToStream(ExportFormatType.Excel);
             Response.ContentType = "application/vnd.ms-excel";
             filename = "data.xls";
             break;
         default: //PDF 
             oStream = (MemoryStream)crReport.ExportToStream(ExportFormatType.PortableDocFormat);
             Response.ContentType = "application/pdf";
             filename = "data.pdf";
             break;
        }
        //write report to the Response stream
        byte[] dataByte = oStream.ToArray();
        Response.Charset = "";
        Response.AddHeader("content-disposition", "fileattachment;filename=" + filename);
        Response.ContentType = "application/octet-stream";
        Response.BinaryWrite(dataByte);
        Response.Flush();
        Response.Clear();
        Response.End();
    }
    catch (Exception ex)
    {
        ErrorLog.Write(ex);
    }
    finally
    {
        //clear stream
        oStream.Flush();
        oStream.Close();
        oStream.Dispose();
    }
}

Just a side note if you can not import Crystal merge module into your VS2003, then you need to register the dll again:
regsvr32 "C:\Program Files\Common Files\Microsoft Shared\MSI Tools\mergemod.dll"

Check Windows Group Users & Clean-up Network Logon

Often used commands inside Windows domain:

Show users in a local group:
>net localgroup administrators

Show users in a domain group:
>net group All_IT_Staff /domain

Delete credential for a network share
>net use \\shareServerName /del

Delete all credentials for all shares:
>net use * /del

Open Credential manager:
>control keymgr.dll
>rundll32.exe keymgr.dll, KRShowKeyMgr