Trigger is special kind of stored proceser

please go through www.w3schools.com.
this is best site for begginners
it contain basic concepts with example

when the exception is thrown it will search for mostly
likely to least likely exception so it will catch in second
catch

it will give compile time error as, the sequence of 
exception class has to be Most Specific => General.

In try block the SQL query will be executed so the exception
will match the SQLException catch because all type of SQL
exception will be match in this SQLException

if we wrote normal query in try block then it will match
Exception catch

frame work provide to developmant tool to create an 
application.

The .NET Framework is Microsoft's platform for building 
applications that have visually stunning user experiences, 
seamless and secure communication, and the ability to model 
a range of business processes. The .Net Framework consists 
of:


Common Language Runtime – provides an abstraction layer 
over the operating system 

Base Class Libraries – pre-built code for common low-level 
programming tasks 

Development frameworks and technologies – reusable, 
customizable solutions for larger programming tasks

commom language specification is in .net, which is used to 
integrated multilanguage application. and suport common 
type system.

int32 is compactibility with VB and C#.

CLS (Common Language Specification) contains a set of rules 
to achieve language interoperability. CLS enables an object 
or application to interact with other objects or 
applications of other languages. All .NET classes follow 
the CLS rules.

function DoPagingOnEnter()  
    {           
        var ControlPrefix = $get('<%
=hdnListViewClientID.ClientID%>').value;
        if(!
(event.keyCode==48||event.keyCode==49||event.keyCode==50||ev
ent.keyCode==51||event.keyCode==52||event.keyCode==53||event
.keyCode==54||event.keyCode==55||event.keyCode==56||event.ke
yCode==57||event.keyCode==8||event.keyCode == 13))
        {
            event.returnValue=false;
        }
        else
        {  
            var number = 0;		                   
            var Message;
            var PrefixId = $get('<%=hdnNodeID.ClientID%
>').value; 
            number = $get(ControlPrefix+'txtPage').value;
            if(!isNaN(number))
            {
                if (event.keyCode == 13) 
                {
                    var status ='1';
                    var PageFilter = /^[0-9]+$/;
                    if(!PageFilter.test($get
(ControlPrefix+'txtPage').value))
                    {
                        status='0';    
                    }
                    else
                    {
                        number = parseInt(number);
                        var MaxPage = 0;
                        MaxPage = parseInt($get('<%
=hdnMaxPage.ClientID%>').value);                    
                        if(1 > number)
                        { 
                            status ='0'; 
                        }                             
                        else if(number > MaxPage)
                        {
                            status ='0'; 
                        }
                        else 
                        {
                            status ='1';
                        }
                    }                    
                    if(status == "0")
                    {                        
                        var mes = "<%
=CommonMessages.InvalidPage%>";
                        ShowMessage(mes,"<%
=CommonMessages.ErrorHeader%>",'Error');
                        content_resize(); 
                        return false; 
                    }
                    else
                    {
                        __doPostBack
((PrefixId+'$btnPaging'), '');
                    }
                }




   <asp:Button ID="btnPaging" runat="server" Text="Button" 
Style="height: 26px; display: none"
                OnClick="btnPaging_Click" />

then the click event in code behind

u dont need to compile but while restarting application it 
get compiled automatically ...if u change in web.config 
file while the application is runnin then MS visual studio 
will give u msg of change occured in config file..

NO, Not required. just restart the application ... even if
you don't the application automatically get restarted once
the web.config file is changed.

3 mistakes in my life is the best book for asp dot net...
five point someone is also good...
but why u want to learn asp dot net....
its not for u my dear sweety..........

your system is the best book for you in the market and not 
only in the market but also in the world but question is 
that if you are a hard worker.