how to send bulk email in asp.net like gmail and yahoo

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C#

if anyone know the coding of send bulk email in C# then please inform me.

if i write some email ids in SEND_TO Textbox then it goes to to the controller and where it calls a send mail function then i pass the content of SEND_TO Textbox in this function . and it shows error at execution time "mail header contains invalid character for comma(,). so if anyone knows ho to remove comma error and directly i can send mail to many mailid .and it does not show the comma error.


if anyone know how to reslove that problem then plaese inform me as soon as possible.