datatable - How to remove complete row from a data table when it is a duplicate row in c# -

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i have data table has duplicate row follow.

|     |                    |            |           |       | |cid  |    usrnme          |   pname    |   prate   | cabin | |-----------------------------------------------------------| |c11  | demo1@gmail.com    |   sample1  |    2000   | b2    | ******* |c14  | demo2@live.com     |   sample2  |    5000   | b3    | |c15  | demo3@yahoo.com    |   sample3  |    8000   | b2    | |c11  | demo1@gmail.com    |   sample1  |    2000   | b2    | ******* |c18  | demo4@gmail.com    |   sample4  |    3000   | l1    | |c11  | demo5@gmail.com    |   sample5  |    7400   | b4    | &&&&&&& ============================================================

note : there different data same id ,see &&&&&&& row

how 1 row above duplicate 2 rows.i have tried this

this code used.

public datatable removeduplicaterows(datatable dtable,string colname) {     colname = "cabin";     hashtable htable = new hashtable();     arraylist duplicatearraylist = new arraylist();       foreach(datarow drow in dtable.rows)     {         if (htable.contains(drow[colname]))             duplicatearraylist.add(drow);         else         {             htable.add(drow[colname], string.empty);         }     }      foreach (datarow drow in duplicatearraylist)         dtable.rows.remove(drow);      return dtable; }

if used above code avoid duplicate according cabin removes all records cabin b2 , keep first 1 only.what want remove full row(keep 1 , delete others).how can that.

its cid decides uniqueness of record. in provided example there 2 rows same cid , entire row same too.. proves if use cid find duplicates desired output

change line of code

colname = "cabin"; colname = "cid";


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