OnMessage() running some code before Send() closes connection

Hello, I have a switch setup so depending on what the incoming message from the client is my program will do different things. I pasted the code below, the case on top works fine, the one on bottom crashes and says connection is not open. I'd like to be able to process information and then send a message back to the client. I apologize if I'm an idiot and doing this completely wrong all together.

public class Website : WebSocketBehavior
    {
        protected override void OnMessage(MessageEventArgs e)
        {
            string msg = "";
            switch (e.Data)
            {
                case var s when e.Data.StartsWith("~echo~"):
                    msg = e.Data.Substring(6);
                    Send(msg);
                    MessageBox.Show(msg);
                    break;
                case var s when e.Data.StartsWith("~getid~"):
                    msg = e.Data.Substring(7);
                    MessageBox.Show(msg);
                    Send(msg);
                    break;
                default:
                    break:
            }
        }      
    }

    internal class WebSocketClass       
    {
        internal void LoadWebSocketServer()
        {
            WebSocketServer wssv = new WebSocketServer("ws://localhost:7890");
            wssv.AddWebSocketService<Website>("/Website");
            wssv.Start();

            
        }
    }

Start with WebSocketBehavior.OnMessage in the provided Website class and trace how Send is reached in each switch case. Then inspect LoadWebSocketServer and the WebSocketServer lifecycle to determine why the connection is closed before the second Send. Done means the requested message-processing flow sends a response without reporting that the connection is not open.