c# - Linq Result Join all Rows Data to string -

i getting data 200k records database , store in linq result columnname email. now,i want show emails linq result , adding them textbox separating ,.

actually,i have prepared datatable linq result , have combined row data code :

var datalists = (from xx in vdc.survey_email_list                   xx.email_group_id == listgroupid                   select xx).tolist();  datatable dtdatalists = linqtodatatable(datalists);  emailids = string.join(",", dtdatalists.asenumerable().select(x => x["emailid"].tostring()).toarray()); 

but,for preparing datatable,it taking long time. so,i thought of preparing string emailids directly linq result. can me?

this code should work i'm not sure it'll faster:

string.join(",", datalists.select(x => x.emailid));