C#后台無刷新頁面彈出alert方法

無刷新彈出警告：       

ScriptManager.RegisterStartupScript(this.Page, this.GetType(),"onekey", "alert('彈出')", true);

 

而以下方法，會刷新彈出，比較難看

Response.Write("<script>alert('彈出')</script>");

ClientScript.RegisterStartupScript(this.Page, this.GetType(),"onekey", "alert('彈出')", true);