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How to know how many pages are their in pagintion

Hi,
can any one please tell me how to know how many total pages are their in grid pagination.my requirements is to show like this

page 1 of totalpages

You can get total number of rows as 
      var total = grid.getRowsNum();
and size of the page
     var size = grid.rowsBufferOutSize

In such case, total count of pages will be 
       Math.ceil(total/size);