[Solved] How to upload (multiple) files to SharePoint Online using CSOM?

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I tested the below code in my local environment; it works fine.

<div>
    <asp:FileUpload ID="upldGradeReport" runat="server" />
    <asp:FileUpload ID="upldExpenseReceipt" runat="server" />

    <asp:Button ID="btnSubmitForm" OnClick="SubmitButton_Click" runat="server" Text="Submit" />
</div>


protected void SubmitButton_Click(object sender, EventArgs e)
{
    sendToSharePoint();
    Response.BufferOutput = true;
    Response.Redirect("Submission.aspx");
}

protected void sendToSharePoint()
{

    try
    {
        string siteUrl = "https://tenant.sharepoint.com/sites/lee";

        ClientContext clientContext = new ClientContext(siteUrl);
        SecureString securePassword = new SecureString();
        foreach (char c in "password".ToCharArray()) securePassword.AppendChar(c);
        clientContext.Credentials = new SharePointOnlineCredentials("[email protected]", securePassword);                
        string sDocName = string.Empty;
        string sDocName1 = string.Empty;
        Uri uri = new Uri(siteUrl);
        string sSPSiteRelativeURL = uri.AbsolutePath;
        sDocName = UploadFile(clientContext,upldGradeReport.FileContent, upldGradeReport.FileName, sSPSiteRelativeURL, "MyDoc");
        sDocName1 = UploadFile(clientContext,upldExpenseReceipt.FileContent, upldExpenseReceipt.FileName, sSPSiteRelativeURL, "MyDoc");

        //prior CSOM code to insert values into a new List Item exists here

        //clientContext.ExecuteQuery();
    }
    catch (Exception ex)
    {
        String ThisError = ex.Message;
    }
}

public String UploadFile(ClientContext clientContext,Stream fs, string sFileName, string sSPSiteRelativeURL, string sLibraryName)
{
    string sDocName = string.Empty;
    try
    {
        var sFileURL = String.Format("{0}/{1}/{2}", sSPSiteRelativeURL, sLibraryName, sFileName);

        Microsoft.SharePoint.Client.File.SaveBinaryDirect(clientContext, sFileURL, fs, true);
        sDocName = sFileName;
    }
    catch (Exception ex)
    {
        sDocName = string.Empty;
        //SPErrorMsg = ex.Message;
    }
    return sDocName;
}

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solved How to upload (multiple) files to SharePoint Online using CSOM?