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Caml to retrieve all items of dropdown list from sharepoint

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I have a sharepoint list "tracker" with fields dropdownlist "Area" and textbox name.
I have 3 values in Area dropdown. I want to retrieve all 3 items from Area drop down and bind to combobox in Winforms.

 

    SP.ClientContext clientcontext = new SP.ClientContext("mysite/sitecoll"); 

  SP.List list = clientcontext.Web.Lists.GetByTitle("tracker");   

clientcontext.Load(list);   

SP.CamlQuery _query = new SP.CamlQuery();   

_query.ViewXml = @"   <View> <Query> <Where> <IsNotNull> <FieldRef Name = 'Area_x0020'/>  

</IsNotNull>  </Where>   </Query>  <RowLimit>10</RowLimit>  </View>";   

SP.ListItemCollection _listitems = list.GetItems(_query);   

clientcontext.Load(_listitems);    clientcontext.ExecuteQuery();   

foreach (SP.ListItem listItem in _listitems.ToList())   

{       

cbAppArea.Items.Add(listItem["Area_x0020"] != null ? listItem["Area_x0020"].ToString() : string.Empty);   

}



         
But This retrieves only one selected item from area but i want all items of that dropdown.


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