How to chose time from DateTimePicker and add datetime value to mysql?

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C#

C#3.5

C#5.0

Hello.
I want to chose date-time from DateTimePicker and add this value to MySQL.
In my data table, I create column "date_time" with datetype type.
And then I set "CustomFormat" of DateTimePicker is "dd-MM-yyyy".
I write code to insert datetime value to MySQL, but value in my data table is 0000-00-00 00:00:00.
Orther column is good.
Please help me this problem. Thank you.
Here is my code

//connect_data();
           byte[] imageBt = null;
           if (txt_path.Text != "")
           {
               FileStream fstream = new FileStream(this.txt_path.Text, FileMode.Open, FileAccess.Read);
               BinaryReader br = new BinaryReader(fstream);
               imageBt = br.ReadBytes((int)fstream.Length);
           }
           else
           {
               imageBt = null;
           }

           String myConnection = "Server=localhost;Database=sctv_data;Port=3306;User ID=root;Password=;Charset=utf8";
           MySqlConnection conDatabase = new MySqlConnection(myConnection);
           string Query = "INSERT into nhap (STT,Ngay_nhap,Ten_thiet_bi,Nha_san_xuat,Don_vi,So_luong,Nhan_tu,Chip_ID,MAC_address,SN,Ghi_chu,Hinh) values ('" + txt_STT.Text + "','" +this.dateTimePicker1.Text+ "','" + txt_ten_tb.Text + "','" + txt_nha_sx.Text + "','" + txt_don_vi.Text + "','" + txt_so_luong.Text + "','" + txt_nhan_tu.Text + "','" + txt_chip_ID.Text + "','" + txt_mac.Text + "','" + txt_sn.Text + "','" + txt_note.Text + "',@hinh);";
           MySqlCommand cmdDataBase = new MySqlCommand(Query, conDatabase);
           MySqlDataReader myReader;
           try
           {
               conDatabase.Open();
               cmdDataBase.Parameters.Add(new MySqlParameter("@hinh", imageBt));
               myReader = cmdDataBase.ExecuteReader();
               MessageBox.Show("SAVE");
               while (myReader.Read())
               {
               }
           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message);
           }