sql - C# - "An element with the same key was already added" -


i work in asp.net mvc , blocked(surrounded) in model damned error "an element same key added", understand not @ why while have same code different requests in other methods of model.

and not think problem can come request because have used her(it) before in project.

public dictionary<string,string> getdonnee() {     dictionary<string, string> list = new dictionary<string, string>();      sqlconnection cn;     sqldataadapter da;     dataset ds;      cn = new sqlconnection(cs_dw);     cn.open();      da = new sqldataadapter("select distinct(ltrim(rtrim(cpic))) code, cpic lib [dw].[dbo].[pic_prod_s001] ", cn);     ds = new dataset();     da.fill(ds, "code");      list.add("reel", "reel");     foreach (datarow row in ds.tables["code"].rows)     {         list.add(row["code"].tostring(), row["lib"].tostring());     }      cn.close();     return list;  }

maybe can test if key in in dictionary

if (!list.containskey(row["code"].tostring()))  {      list.add(row["code"].tostring(), row["lib"].tostring()); }

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