Get column name from radgrid of telerik in an array

function GetColumnNames()
        {
         var grid = $find("<%=RadGrid1.ClientID %>"); 
         var columnCount = grid.get_masterTableView().get_columns().length;
         var Colname=new Array();
         for(var i=0;i<columnCount;i++)
         {
         var UniqueName=grid.get_masterTableView().get_columns()[i].get_uniqueName();
         Colname[i]=UniqueName;
         }
        }