how  to  retrive  an  value   from  xml   for a   particluar  node  and    again update the  xml  
<?xml version="1.0"?>
     <Image>    
        <Overview>13</Overview>  
        <Gallery1>1</Gallery1>    
        <Gallery2>4</Gallery2>
        <Gallery3>6</Gallery3>    
        <Gallery4>1</Gallery4>
     </Image>
 hi  this is my  xml  file 
   i have  an  dropdown value   with values  [gallery1, gallery2, gallery3  so on .
  if user select  an   gallery2  and types in the  text box  as  = 5
 and  clicks ok  button then i need  to load  my  above  xml file   and  check  what is  gallery  value  we  need  to update  but  first  we  need to get  the  value from xml
 her  i am trying to update galery2  so  before i need   get  gallery2  value =4  
 then   add the  new value  with old  value{5+4=9)  and then  save .  so  now  gallery2   will  contain  value  as  9

result

     <?xml version="1.0"?>
         <Image>    
            <Overview>13</Overview>  
            <Gallery1>1</Gallery1>    
            **<Gallery2>9</Gallery2>**
            <Gallery3>6</Gallery3>    
            <Gallery4>1</Gallery4>
         </Image>
how  to  retrive  an  value   from  xml   for a   particluar  node  and    again update the  xml  
===

<?xml version="1.0"?>
     <Image>    
        <Overview>13</Overview>  
        <Gallery1>1</Gallery1>    
        <Gallery2>4</Gallery2>
        <Gallery3>6</Gallery3>    
        <Gallery4>1</Gallery4>
     </Image>
 hi  this is my  xml  file 
   i have  an  dropdown value   with values  [gallery1, gallery2, gallery3  so on .
  if user select  an   gallery2  and types in the  text box  as  = 5
 and  clicks ok  button then i need  to load  my  above  xml file   and  check  what is  gallery  value  we  need  to update  but  first  we  need to get  the  value from xml
 her  i am trying to update galery2  so  before i need   get  gallery2  value =4  
 then   add the  new value  with old  value{5+4=9)  and then  save .  so  now  gallery2   will  contain  value  as  9

result

     <?xml version="1.0"?>
         <Image>    
            <Overview>13</Overview>  
            <Gallery1>1</Gallery1>    
            **<Gallery2>9</Gallery2>**
            <Gallery3>6</Gallery3>    
            <Gallery4>1</Gallery4>
         </Image>