Hi Vishal, 

You need to write a relationship SOQL to achieve this. Here is a sample code
 

<apex:page controller="SampleVfDisplayAccountNContactController" action="{!loadAccounts}">
<apex:form >
    <apex:pageBlock id="details">
    <apex:pageBlockTable id="table" value="{!AccountWrapperList}" var="aw">
     <apex:column value="{!aw.AccountName}"/>
    <apex:column value="{!aw.BillingCountry}"/>AccountName
    <apex:column value="{!aw.ContactName}"/>
    </apex:pageBlockTable>

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

 

public class SampleVfDisplayAccountNContactController
{
    public  String accname{get; set;}
    public  List <AccountWrapper> AccountWrapperList{get;set;}
    public   void loadAccounts()
    {

        AccountWrapperList = new List<AccountWrapper>();
    if(accname !=  ' ')
        {
                   string srcqry = 'SELECT Name,BillingCountry,(Select Id, FirstName, LastName From Contacts) FROM Account where name like \'%'+accname+'%\'';            
        }
        for(Account a : Database.query(srcqry))
        {
            for(Contact c : a.Contacts)
            {
                AccountWrapper aw = new AccountWrapper(a.name, a.BillingCountry,c.FirstName + c.LastName);
                AccountWrapperList.add(aw);

            }
        }
        System.debug('AccountWrapperList'+AccountWrapperList);
    }

    public class AccountWrapper{
    public  String AccountName{get; set;}
    public  String BillingCountry{get; set;}
     public  String ContactName{get; set;}
        AccountWrapper(String AccountName,String BillingCountry, String ContactName)
        {
            this.AccountName = AccountName;
            this.BillingCountry = BillingCountry;
            this.ContactName = ContactName;   
        }
    }
}

This is taken from this post

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Anudeep