Asp.net проблема управления загрузкой файлов

3rd Time a charm.  
ASP.Net 4.6.1. I have an upload control on my form. When a user selects a file for upload then decides not to upload and remove the file the control retains the file even after being deleted from the control's text box. I do have filters on file type and file size.  

protected void btnUploadPartCDoc_Click(object sender, EventArgs e)
{

    /* ************************************************************************************************ */
    /*  12/15/2016 RR - Upload file size and type are set in the web.config file.                       */
    /*                - Limit File Size to 5MB per upload/client.                                       */
    /*                - File Type comma delimeted string.                                               */
    /* ************************************************************************************************ */
    string providerCode = Session["providerCode"].ToString();
    string loadFile = string.Empty;
    string maxFileSize = ConfigurationManager.AppSettings["MaxUploadFileSize"];
    IEnumerable<string> allowedFileTypes = ConfigurationManager.AppSettings["AllowedUploadFileTypes"].Split(',');
    string saveDir = @"Document\Refugee\";
    string appPath = Request.PhysicalApplicationPath.ToString(); ;
    string Lst3 = string.Empty;
    string oARegNum = string.Empty;
    string imagePath = string.Empty;
    string savePath = string.Empty;
    string folderPath = string.Empty;
    int fileSize = 0;
    bool isValidFileType = false;

    // --------------------------------------------------------
    // -- To Do:
    // --------------------------------------------------------
    // -- some providers on upload are upload this control type
    // -- rather than the physical image.
    // --------------------------------------------------------
    // -- System.Web.UI.WebControls.FileUpload
    // --------------------------------------------------------
    string fileExt = System.IO.Path.GetExtension(fleUpload.FileName).ToString().ToLower();
    if (fleUpload.HasFile)
    {
        if (!fleUpload.FileName.ToString().Contains("System.Web.UI.WebControls.FileUpload"))
        {
            if (Session["workingProvider"] != null) { string provID = Session["workingProvider"].ToString(); }
            oARegNum = Session["oARegNum"].ToString();
            imagePath = fleUpload.FileName.ToString();
            imagePath = imagePath.Replace(",", "");
            savePath = appPath + saveDir + imagePath;
            folderPath = appPath + saveDir;
            fileSize = fleUpload.FileBytes.Length;

            foreach (string uploadfileType in allowedFileTypes)
            {
                if (fileExt == uploadfileType)
                {
                    isValidFileType = true;
                    break;
                }
            }
            if (!isValidFileType)
            {
                hdnFieldAlert.Value = "error; ERROR! File not allowed.;Document Upload";
                return;
            }
            else
            {
                if (fileSize <= Int32.Parse(maxFileSize))
                {
                    if (Utilities.IsNumeric(oARegNum))
                        try
                        {
                            hdnFieldAlert.Value = "info; Changes have been saved;Record Update";
                            if (hdnFieldAlert.Value != "info; Changes have been saved;Record Update")
                            {
                                hdnFieldAlert.Value = "error; ERROR! You must first Save Refugee Detail form.;Document Upload";
                                return;
                            }

                            if (File.Exists(savePath)) File.Delete(savePath);
                            fleUpload.SaveAs(savePath);

                            SqlConnection con = new SqlConnection(getConnectionString("dbConn").ToString());
                            SqlCommand sqlCmd = new SqlCommand("update [dbo].[provref] set oPartCDocUrl = @imgPath where oprovcode = @providerCode and [oAregNum] = @clientNum", con);
                            sqlCmd.Parameters.Add("@imgPath", SqlDbType.VarChar).Value = imagePath;
                            sqlCmd.Parameters.Add("@clientNum", SqlDbType.VarChar).Value = oARegNum;
                            sqlCmd.Parameters.Add("@providerCode", SqlDbType.VarChar).Value = providerCode;
                            con.Open();
                            sqlCmd.ExecuteNonQuery();
                            con.Close();

                            // ****************************************************************************************
                            // reload form with newly uploaded image
                            // ****************************************************************************************
                            provRefSelectByRecordId();

                            hdnFieldAlert.Value = "info; Changes have been saved. File successfully uploaded.;Document Upload";
                        }
                        catch (Exception ex)
                        {
                            hdnFieldAlert.Value = "error; ERROR!  " + ex.Message.ToString() + " ;Document Upload";
                        }
                }
                else
                {
                    hdnFieldAlert.Value = "error; ERROR! File size too large.;Document Upload";
                    return;
                }
                return;
            }
        }
        else
        {
            hdnFieldAlert.Value = "error; ERROR! Bad File. File Not Uploaded.;Document Upload";
            return;
        }
    }
    else
    {
        hdnFieldAlert.Value = "error; ERROR! Bad File. File Not Uploaded.;Document Upload";
        return;
    }
}