Hello Guys, 
I have a requirement to export visualforce table to excel. 
I create a visualforce page with list of account records and a command button - export to excel. Once the button is clicked it will redirect to similar visualforce page with contenttype ="application/vnd.ms-excel#filename.xls". Excel file is downloading but my problem is it has to redirect to original page. 
check my code below, 

Vf page(export1): 
<apex:page controller="exportexcel"  >
<apex:pageBlock title="Records">
<apex:pageBlockTable value="{!rec}" var="r">
<apex:column value="{!r.name}"/>
<apex:column value="{!r.phone}"/>
<apex:column value="{!r.industry}"/>
<apex:column value="{!r.Type}"/>
</apex:pageBlockTable>
<apex:form >
<apex:commandButton value="export to excel" action="{!exportnow}"/>
</apex:form>
</apex:pageBlock>
</apex:page>

Controller: 
public class exportexcel {

    public PageReference exportnow() {
        pagereference pager = new pagereference('/apex/export');
        pager.setredirect(true);
        return pager;
    }


public list<account> rec {get; set;}

public exportexcel(){

rec = [select name, type, industry, phone from account limit 10];
}
}
vfpage: (export):
<apex:page controller="exportexcel" contentType="application/vnd.ms-excel#filename.xls" >
<apex:pageBlock title="Records">
<apex:pageBlockTable value="{!rec}" var="r">
<apex:column value="{!r.name}"/>
<apex:column value="{!r.phone}"/>
<apex:column value="{!r.industry}"/>
<apex:column value="{!r.Type}"/>
</apex:pageBlockTable>
</apex:pageBlock>
</apex:page>

Kindly help.. 
Thank you.