客户端控件添加runat="server"无回发事件
if (!IsPostBack)
{
....
btnSendMes.Attributes["onclick"] = string.Format("SendMes('{0}');", jobseekerId);
.....
{
....
btnSendMes.Attributes["onclick"] = string.Format("SendMes('{0}');", jobseekerId);
.....