Success message for form submit with fileupload ASP.NET SQL server?

protected void Button1_Click(object sender, EventArgs e)
        {

            string constr = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
            using (SqlConnection con = new SqlConnection(constr))
            {
                string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
                string contenttype = FileUpload1.PostedFile.ContentType;
                using (Stream fs = FileUpload1.PostedFile.InputStream)
                {
                    using (BinaryReader br = new BinaryReader(fs))
                    {
                        byte[] bytes = br.ReadBytes((Int32)fs.Length);

                        string query = "INSERT INTO LeaveReqTable (Name, EPFNo, FileName, ContentType, Data) VALUES (@Name, @EPFNo, @FileName, @ContentType, @Data)";
                        using (SqlCommand cmd = new SqlCommand(query))
                        {
                            cmd.Connection = con;
                            con.Open();

                            cmd.Parameters.AddWithValue("@Name", TextBox1.Text);
                            cmd.Parameters.AddWithValue("@EPFNo", TextBox2.Text);
                            cmd.Parameters.AddWithValue("@FileName", filename);
                            cmd.Parameters.AddWithValue("@ContentType", contenttype);
                            cmd.Parameters.AddWithValue("@Data", bytes);

                            int k = cmd.ExecuteNonQuery();
                            if (k != 0)
                            {
                                Label1.Text = "Record Inserted Succesfully into the Database";
                                Label1.ForeColor = System.Drawing.Color.CornflowerBlue;
                                ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Record Inserted Successfully')", true);
                            }
                            con.Close();
                        }
                    }
                }
                Response.Redirect(Request.Url.AbsoluteUri);
                ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Record Inserted Successfully')", true);
            }
        }

I've tried submitting a simple text form and I get success message, but not when fileupload code is there.