I’m using VS2017 and my browser is Microsoft Edge (unfortunately, no other browser, I must use this). Upon selecting the file I want to upload, the debugging immediately stops. Am I missing something?

I have below code for my Upload.aspx:

<form id="form1" method="post" runat="server" enctype="multipart/form-data" action="Upload.aspx">
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <br />
        <asp:Button ID="btnupload" runat="server" Text="Upload" OnClick="btnupload_Click1" />
        <br />
         <asp:Label runat="server" ID="UploadStatus"></asp:Label>  
    </form>

And I have below for my Upload.aspx.cs button:

protected void btnupload_Click1(object sender, EventArgs e)
        {
            if ((FileUpload1.PostedFile != null) && (FileUpload1.PostedFile.ContentLength > 0))
            {
                string fn = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
                string SaveLocation = Server.MapPath("Upload") + "\" + fn;
                try
                {
                    FileUpload1.PostedFile.SaveAs(SaveLocation);
                    UploadStatus.Text = "The file has been uploaded.";
                }
                catch (Exception ex)
                {
                    UploadStatus.Text = "Error: " + ex.Message;
                }
            }
            else
            {
                UploadStatus.Text = "Please select a file to upload.";
            }
        }