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I want to draganddrop all the rows in one grid to another grid at one selection. please suggest your comments. Moreover i want to download dhtmlx_extdrag.js.

You can select all rows by
    grid.selectAll();
But the drag-n-drop of multiple rows supported only in pro version.
( standard version supports only drag-n-drop of single row , but you can use onDrag event to detect the fact of d-n-d and move all rows by grid.moveRowTo command )