C# .NET - Are the two systems - "Smart Client Ajax GUI system" & "Smart Client" same or different?

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I am pasting files below. Wish it was easier to do - Sorry. * ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** * Form1.cs * ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** * using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; namespace WindowsApplication5 { / / / <summary> / / / Summary description for Form1. / / / < / summary> public class Form1 : System.Windows.Forms.Form { private System.Data.OleDb.OleDbCommand oleDbSelectCommand1; private System.Data.OleDb.OleDbCommand oleDbInsertCommand1; private System.Data.OleDb.OleDbCommand

What is the difference between VB.NET and C#? (I) what is the difference between System exceptions and Application exceptions? (I)What is CODE Access security? (I)What is a satellite fundamental of published or precreated objects in Remoting? (A) What are the ways in which client can create object on server in CAO model? (A) Are CAO stateful in nature? (A be done? (I) Is it a good design practice to distribute the implementation to Remoting Client? (A) What are LeaseTime, SponsorshipTime, RenewonCallTime and LeaseManagerPollTime? (A) Which config file has all the of using Viewstate for state management? (B) How can you use Hidden frames to cache client data ? (I) What are benefits and limitations of using Hidden frames? (I) What are benefits in C#? (A)Can two catch blocks be executed? (A) What is the difference between System.String and System.StringBuilder classes? Chapter 7: ASP.NET (B) What’ is the sequence in which ASP.NET tampered? (B) What is the use of @ Register directives? (B) What is the use of Smart Navigation property? (B) What is AppSetting Section in “Web.Config” file? (B) Where is View How can we check if all the validation control are valid and proper? (A) If client side validation is enabled in your Web page, does that mean server side code is

System.NullReferenceException: object reference not set to instance of an object Hello all, kindly help me Subject error. this c# code works for timeshhet which is conected to our electronic mangement system on sql databse i am facing only on very few machines the message: System.NullReferenceException: Object reference not set to an instance of an object. at time_sheet.Time_Card.EnableFormControls in c: \ documents and settings \ mabdalla \ desktop \ time sheet project \ time_card.cs:line 1251 at System.Windows.Forms.Form.OnActivated(EventArgs e) at System.Windows.Forms.Form.set_Active(Boolean value) at System.Windows.Forms.Form.WmActivate(Message& m) at System.Windows.Forms.Form.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message