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I have read the blog Render VFP in EXCEL and I was able to partially achieve my requirement. I Have a wrapper class with say 3 variables. Now when the page is rendered as Excel, results are coming as expected . 3 Variables so 3 Columns got created in excel. But I need to give Customized names for the columns that are created in excel. How can I achieve that. As of now column name is coming as blank. pls suggest.

public class sample{
  public String var1{get;set;}
  public String var2{get;set;}
  public String var3{get;set;}
}

<apex:page controller="SampleController" contentType="application/vnd.ms-excel#SampleFIleName.xls" cache="true">
    <apex:pageBlock>
        <apex:pageBlockTable value="{!reportExcel}" var="rep">
          Name : <apex:column value="{!rep.var1}"/>  
           <apex:column value="{!rep.var2}"/> 
            <apex:column value="{!rep.var3}"/>
        </apex:pageBlockTable>
    </apex:pageBlock>
</apex:page>
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<apex:column> components can have their headers specified with the headerValue attribute, or by including an <apex:facet> within the element:

<apex:column value="{!rep.var1}" headerValue="Column Name" />  

or

<apex:column value="{!rep.var1}">
    <apex:facet name="header">
        Column Name
    </apex:facet>
</apex:column>  

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