c# - appending a dataset to a session variable -

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i know how add dataset session 

dataset ds = getresults(); session["xyz "] = ds;

is there way can append dataset session ?

i trying 

  session["xyz"] = ds + ds1; //ds1 dataset  or  session["xyz"] = ds + (dataset)session["xyz"];

it throws error .. there way ?

dataset objects have merge method

((dataset)session["xyz"]).merge(ds1) ;

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