this.btn_sendEmail.Attributes.Add("onclick", ClientScript.GetPostBackEventReference(btn_sendEmail, "Click") + ";this.Disabled=true; this.value='提交中...';");
this.btn_sendEmail.Attributes.Add("onclick", ClientScript.GetPostBackEventReference(btn_sendEmail, "Click") + ";this.Disabled=true; this.value='提交中...';");