You create a Web Form. The Web Form allows users to calculate values and display the results in a label named lblResults. You need to capture all unhandled exceptions on the Web Form through the Error event. The Error event must capture each unhandled exception and display it on the Web Form. Which code segment should you use?（）
- A protected void Page_Error(object sender, EventArgs e) { lblResults.Text = e.ToString(); e=null;}
- B protected void Page_Error(object sender, EventArgs e) { lblResults.Text = Server.GetLastError().ToString(); Server.ClearError();}
- C protected void Page_Error(object sender, EventArgs e) Response.Write(e.ToString()); e=null;}
- D protected void Page_Error(object sender, EventArgs e) Response.Write(Server.GetLastError().ToString()); Server.ClearError();}