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Archive for January, 2007

                Before few months , I was assign a task to read store connection string in registry and read the value from there whenever require. This is something new and I had never implemented it before.

                  Thanks to my collegue (now friend ) SEHUL a little master, who helped me in doing this. Below is the code.

Microsoft.Win32.RegistryKey rgk = Microsoft.Win32.RegistryKey.OpenRemoteBaseKey(Microsoft.Win32.RegistryHive.LocalMachine, “MachineName”);

rgk = rgk.OpenSubKey(@”HARDWARE\DESCRIPTION\SYSTEM\CentralProcessor”);
string strValue =Convert.ToString( rgk.GetValue(“Identifier”));
MessageBox.Show(strValue);

Happy programming.

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            I was reading an article about Active Directory as Active directory is installed in our office recenly. It was really nice article and the auther has mentioned that you can access active directory using c# or any language. I tried to implement that, obviously I had search on google and found some cod for same. I chose the one and modify it according to my need. Below is the code,

 

using System;
using System.Web;
using System.Web.UI.WebControls;
using System.Data;
using System.Collections;
using System.DirectoryServices;

namespace DirectorySearcher_infovish
{
/// <summary>
/// Summary description for DirectorySearcher.
/// </summary>
public class DirectorySearch
{
public Hashtable objHash;
static int count=0;
SortedList objSortedList;
public string domain;

public DirectorySearch()
{
}

public void FillEmployee(System.Web.UI.WebControls.DropDownList ddlEmpName)
{
string domain = System.Configuration.ConfigurationSettings.AppSettings[“DomainIP”];
DirectoryEntry de = new DirectoryEntry(“LDAP://”+domain);
de.Username = username; // Domain Admin user name
de.Password = password; // Domain Admin password
DirectorySearcher ds = new DirectorySearcher(de);
ds.Filter = “(&(objectClass=user)(objectCategory=person))”;
ds.Sort.PropertyName = “CN”
ds.Sort.Direction = SortDirection.Ascending;
ds.SearchScope = SearchScope.Subtree;
ds.PageSize = 4000;

count++;
try
{
objSortedList = new SortedList();
foreach(SearchResult result in ds.FindAll())
{
DirectoryEntry deTemp = result.GetDirectoryEntry();
try
{
objSortedList.Add (deTemp.Properties[“cn”].Value.ToString(),deTemp.Properties[“Mail”].Value.ToString());
}
catch(Exception ex)
{
ex.Message.ToString();
}
}
FillGroup(ddlEmpName);
}
catch(Exception ex)
{
HttpContext.Current.Response.Write(ex.ToString());
}
finally
{
}
}

}

}

Happy Programming.

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        Today I get some free time, so I thought lets work on other project currently running in organisation. I found that we are using caching one of the project and database is SQL Server 2000. We have to set dependancy for cached data. I have implemented this previously and asked my Project Lead to let me do that part. However when I started working on that I found I forgot the few things ( Specially SP that generates a text file when data in perticular table or tables be changed).

         I seach on my old archives and foud the SP (obviosly that is not written by me, as I not that much good in SQL anyway). Lets start with the things what I did. I have created a demo application which has two pages. One with read only Grid and other with editable grid. The basic Idea is when ever changes occure in few tables or selected table, one text file is generated (is it is not already generated) or append.

         Lets start with SP, below is the SP that append or generate text file.

CREATE PROCEDURE sp_AppendToFile(@FileName varchar(255), @Text1 varchar(255)) AS

DECLARE @FS int, @OLEResult int, @FileID int

EXECUTE @OLEResult = sp_OACreate ‘Scripting.FileSystemObject’, @FS OUT

IF @OLEResult <> 0 PRINT ‘Scripting.FileSystemObject’

execute @OLEResult = sp_OAMethod @FS, ‘OpenTextFile’, @FileID OUT, @FileName, 8, 1

IF @OLEResult <> 0 PRINT ‘OpenTextFile’

execute @OLEResult = sp_OAMethod @FileID, ‘WriteLine’, Null, @Text1

IF @OLEResult <> 0 PRINT ‘WriteLine’

EXECUTE @OLEResult = sp_OADestroy @FileID

EXECUTE @OLEResult = sp_OADestroy @FS

Fig – (1)  SP: to modify Text file.

         My requirement is that whenever records in Employee table chage, it should modify the data that is available in cache and data should be displayed from Server instead of cache. To do this I have created one trigger on Employee table which call Sp (shown in Fig – (1)) and change the text file. Below is the trigger that I used,

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

ALTER TRIGGER [UpdateEmployee]
ON [dbo].[Employee]
FOR INSERT, UPDATE , DELETE
AS
BEGIN

exec sp_AppendToFile ‘FileName.txt’ , ‘Message’

END

Fig – (2) Trigger: This will change Text file

 

  Now for coding, below is the code that I have used for inserting dataset in cache with file dependency.

 

if (Cache[“Data”] == null)
{
     SqlDataAdapter sda = new SqlDataAdapter(cmd);
     sda.Fill(dsTemp);
    System.Web.Caching.CacheDependency objDependancy   =new System.Web.Caching.CacheDependency(@”FileName.txt”);
Cache.Insert(“Data”, dsTemp, objDependancy,   DateTime.Now.AddDays(1), System.Web.Caching.Cache.NoSlidingExpiration, System.Web.Caching.CacheItemPriority.High, null);


}
else
{
          dsTemp = (DataSet)Cache[“Data”];
}

I hope this will help you. Happy Programming.

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