how to pass byte[] to web service

hii..

Can anybody tell me that, how to implement following method in class file... 

 

 

[WebMethod]

public bool clientInsert(string clientname, string clientadd, DateTime clientbirthdate, DateTime anniversarydate, string phoneno, string mobileno, string emailid, string gender,byte[] photo, int userid, bool isactive)

{

client cl = new client(-1, clientname, clientadd, Convert.ToDateTime(clientbirthdate), Convert.ToDateTime(anniversarydate), phoneno, mobileno, emailid, gender,photo, userid, isactive);

a = cl.Insert();

return a;

}