waht is mean by workflow rules and alerts pls tell me clearly about workflow &approvales .then iwant difference between workflow and approvals 

hiiii   anyone can tell me about workflow alerts clearly with exmple

pls tell me clearly about account hierarchy 

how can i restrict when they are not give specific username & password and i want restrict when they give wrong password&username please suggest me .provide clear idea for me iam begining of this .

i dont know that concept how we use ?when we use that ?pls tell me 

i want to give a  different colors to the every field in visualforce page can u help me 

In this program i have doubt about pageblock table because i can't see details of object .pls solve my problem .

but it shows the error "Error: Unknown property  String.price__c" 

<apex:page standardController="rajesh__c">
<apex:form >
<apex:pageBlock >
<apex:pageBlockButtons >
<apex:pageMessages ></apex:pageMessages>
<apex:commandButton action="{!save}" value="save"></apex:commandButton>
<apex:commandButton action="{!cancel}" value="cancel"></apex:commandButton>
</apex:pageBlockButtons>

<apex:pageBlockSection >
<apex:inputfield value="{!rajesh__c.name}"></apex:inputfield>
<apex:pageBlockTable value="{!rajesh__c.Name}" var="raj" >
<apex:column value="{!raj.price__c}"></apex:column>
<apex:column value="{!raj.subject__c}"></apex:column>

</apex:pageBlockTable>
</apex:pageBlockSection>
</apex:pageBlock>

</apex:form>

</apex:page>

how can i give a discount a fees throw formula can u tell me clear idea about it. pls help me 

can u tell me a controller class for this code ?

<apex:page id="page1"

<apex:form id="form1">

<apex:pageBlock id="block1">

<apex:pageBlockSection id="section1">

<apex:outputText >User Name</apex:outputText>

<apex:inputText id="name" value="{!name}"/>

<apex:outputText >User Password</apex:outputText>

<apex:inputSecret id="password" value="{!password}"/>

<apex:commandButton id="save1" value="Save" action="{!save}" onclick="CheckSave()" />

</apex:pageBlockSection>

</apex:pageBlock>
</apex:form>

</apex:page>

dis is my code but i can't set new button 

<apex:pageBlockButtons >
<apex:commandButton action="{!naNew}" value="New"/>
</apex:pageBlockButtons>

public pagereference naNew(){
// book__c b = new book__c();
pagereference sp = new pagereference('/apex/newpage');
return sp;
}

in this program i discount 50% of fee but i can't get it in data model .

global class batchapexprocessing implements Database.batchable<sobject>
{

global Database.querylocator<course__c>start(Database.batchablecontext bc){
string query='select name,faculty__c,faculty_name__c,fee__c,femail__c from course__c';
return database.getquerylocator(query);
}
global void execute(database.batchablecontext bc,list<course__c>clist){
for(course__c f:clist){
f.fee__c*=0.50;
}
update clist;
}
global void finish(database.batchablecontext bc){
}
}

i want to give password for every application in datamodel how to do .

teach me with clarification pls 

pls explain me with example.

IAM TRYING TO DO LIKE THIS BUT THAT DOES'T WORK IN DEVELOPER CONSOLE WHY SO.IT SHOWS ERROR(INSERT FAILED)


@istest
public class rajinsert{
static testmethod void raj(){
rajesh__c a = new rajesh__c();
a.name = 'Mumbai';
a.price__c=9000;
a.subject__c='sfdc';
rajesh__c b=new rajesh__c();
b.name = 'raj';
b.price__c=4000;
b.subject__c='c';
rajesh__c c=new rajesh__c();
c.name = 'raj';
c.price__c=4400;
c.subject__c=C++';
list<rajesh__c> ab=new list<rajesh__C>();
ab=[select name,price__C,subject__c from rajesh__C ];
ab.add(a);
ab.add(b);
ab.add(c);
insert ab;
}
}

PLS HELP ON THAT QUESTION .IWANT TO CREATE USERNAME,PASSWORD IN MY VISUALFORCE PAGE.

can anyone help me on this video how to do this in  validation formulas pls help me ............

http://www.youtube.com/watch?v=UO2X7rjjGBQ

In the data model when i insert name in name field  i should have to enter only characters i want to do no ride to enter numbers in the name field how to do that.

waht is mean by workflow rules and alerts pls tell me clearly about workflow &approvales .then iwant difference between workflow and approvals 

how can i restrict when they are not give specific username & password and i want restrict when they give wrong password&username please suggest me .provide clear idea for me iam begining of this .

i dont know that concept how we use ?when we use that ?pls tell me 

In this program i have doubt about pageblock table because i can't see details of object .pls solve my problem .

but it shows the error "Error: Unknown property  String.price__c" 

<apex:page standardController="rajesh__c">
<apex:form >
<apex:pageBlock >
<apex:pageBlockButtons >
<apex:pageMessages ></apex:pageMessages>
<apex:commandButton action="{!save}" value="save"></apex:commandButton>
<apex:commandButton action="{!cancel}" value="cancel"></apex:commandButton>
</apex:pageBlockButtons>

<apex:pageBlockSection >
<apex:inputfield value="{!rajesh__c.name}"></apex:inputfield>
<apex:pageBlockTable value="{!rajesh__c.Name}" var="raj" >
<apex:column value="{!raj.price__c}"></apex:column>
<apex:column value="{!raj.subject__c}"></apex:column>

</apex:pageBlockTable>
</apex:pageBlockSection>
</apex:pageBlock>

</apex:form>

</apex:page>

how can i give a discount a fees throw formula can u tell me clear idea about it. pls help me 

dis is my code but i can't set new button 

<apex:pageBlockButtons >
<apex:commandButton action="{!naNew}" value="New"/>
</apex:pageBlockButtons>

public pagereference naNew(){
// book__c b = new book__c();
pagereference sp = new pagereference('/apex/newpage');
return sp;
}

In the data model when i insert name in name field  i should have to enter only characters i want to do no ride to enter numbers in the name field how to do that.

@istest
public class rajinsert{

static testmethod void raj(){

rajesh__c a = new rajesh__c();

a.name = 'Mumbai';
a.price__c=9000;
a.subject__c='sfdc';

rajesh__c b=new rajesh__c();

b.name = 'raj';
b.price__c=4000;
b.subject__c='c';

rajesh__c c=new rajesh__c();

c.name = 'raj';
c.price__c=4400;
c.subject__c=C++';

list<rajesh__c> ab=new list<rajesh__C>();
ab=[select name,price__C,subject__c from rajesh__C ];
ab.add(a);
ab.add(b);
ab.add(c);
insert ab;
}


}

AFTER I EXECUTE THIS PROGRAM AGAIN I CAN'T INSERT MORE FIELDS AND THEN I WANT TO DELETE 'a,b' IN THIS PROGRAM . pls help me 

Hai  iam confused about @istest class program can u tell about that with example