hi every body after long tome i am using Asp.NEt 2010 but when i define class on page then it give error------ System.NullReferenceException: Object reference not set to an instance of an object. at ttt.DBOpration..ctor() in f:\Piyush Project\WebSite\holyschoolmanagementsystem\App_Code\DBOpration.cs:line 20 at Default3.uxtxtbtnregister_Click(Object sender, EventArgs e) in f:\Piyush Project\WebSite\holyschoolmanagementsystem\Schoolregistration.aspx.cs:line 21

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

Hello Friend I am connectin Mysql in vb.net2008 on vista then its give error(Unable to connect to any of the specified MySQL hosts.) but whene i conectthis on xp os then its excute .... {} My Code- MySqlConnection _MySqlConnection; MySqlCommand _MySqlCommand; MySqlDataAdapter _MySqlDataAdapter; string _Conentionstring = "server=localhost;database=schoolinventory;user id=root;password=;"; public int GetId() { try { _MySqlConnection = new MySqlConnection(_Conentionstring); _MySqlConnection.Open(); string _Adpstring = "select Count(*) from goods"; _MySqlDataAdapter = new MySqlDataAdapter(_Adpstring, _Conentionstring); DataSet _ds=new DataSet(); _MySqlDataAdapter.Fill(_ds); int i = Convert.ToInt32( _ds.Tables[0].Rows[0].ItemArray[0].ToString()); return 0; } catch (Exception ex) { return 0; } }

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

Hello friends i am conecting mysql in asp.net 2010 on vista but it junrate error:-Unable to connect to any of the specified MySQL hosts. Please help Thanks

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

Hash table:- System.Collections.Hashtable sdsd = new Hashtable(); sdsd.Add("", ""); Collection:- c# have not collection as vb.net(Vb Language) on the place of collection u use sorted arrylist.

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

YES but i want to handle this without error?

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

thanks for reply i want to avoid network failures error.when network is not available. so i want check database is available before open the connection object

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

hello friend how to check database is available before open the connection object? Please help me. Thanks

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

ANSWER:-http://www.infinitec.de/post/2004/12/30/Find-an-user-in-a-multi-domain-Active-Directory-enironment-programmatically.aspx :rose:

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

if u post this Q then which forum u post ?

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

how much experience have in ASp.net.....raise above from static pages...........

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

Dear Friend how to search users from active directory in different FOREST? please help me. Thanks

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

if we are useing EnterpriseLibrary(data base) and not properly close all the object then it create possibility of mummery likes Problem. or effect on the website process and speed.

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

Whats the benefit of the Microsoft.Practices.EnterpriseLibrary? and whats the demerits of these DLL's is this secure more than simple database connectivity Please help me Thanks..

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

Hi friend My web services give the error of 404 how i resolved to this problem please help me.

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

Can we use PHP code in Asp.net? it's possible. Please help me.. thanks

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

YEs we r using Excel formula in asp.net

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

Hello Friends How to use Intel Math Kernel Library in Programing. Please help me.

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

but The Mono Project not support all namespace of .net for example:-Wmi,Drive Info and Etc

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

Dear Friends. How to run .net application on Macintosh operating system. .net WMI works on Macintosh Operating System or not. Please help me resolved this problem.

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com

a Lots of Thanks For Help:rose:

Piyush Vardhan Singh p_vardhan14@rediffmail.com Eventure Technology http://holyschoolofvaranasi.blogspot.com http://holytravelsofvaranasi.blogspot.com