HOW get rdlc in pdf

i want to get only pdf format of rdlc report using following code.

protected void ReportViewer2_Load(object sender, EventArgs e) 
        {         
      string exportOption = "Word";
 string exportOption1 = "Excel"; 
            RenderingExtension extension = ReportViewer2.LocalReport.ListRenderingExtensions()
.ToList().Find(x => x.Name.Equals(exportOption, StringComparison.CurrentCultureIgnoreCase));
 if (extension != null)            
 {
 System.Reflection.FieldInfo fieldInfo 
= extension.GetType().GetField("m_isVisible",
 System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);      
           fieldInfo.SetValue(extension, false);      
       }    
         RenderingExtension extension1 = ReportViewer2.LocalReport.ListRenderingExtensions()
.ToList().Find(x => x.Name.Equals(exportOption1, StringComparison.CurrentCultureIgnoreCase));
 if (extension1 != null)
 {     
            System.Reflection.FieldInfo fieldInfo1 = extension1.GetType().GetField("m_isVisible",
 System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);  
               fieldInfo1.SetValue(extension1, false);   
          }    
     } 
problem is that when i use "PDF" then its hide the PDF format from the dropdownlist ,but not working with excel or word??plz guide