当我执行这个的时候

private void button1_Click(object sender, EventArgs e)
    {
        panel1.Visible = true;

        MySqlConnection baglanti = new MySqlConnection("Server=localhost;Database=mydb;Uid=root;Pwd='';");
        baglanti.Open();
        MySqlCommand komut = new MySqlCommand("select*from mydb.malzemeler", baglanti);
        MySqlDataReader oku = komut.ExecuteReader();
        DataTable dt = new DataTable();
        dt.Load(oku);

        comboBox2.DataSource = dt;
        comboBox2.DisplayMember = "malzemeisim";
        comboBox2.ValueMember = "idmalzemeler";

        MySqlCommand komut2 = new MySqlCommand("select*from mydb.santiye", baglanti);
        MySqlDataReader oku2 = komut2.ExecuteReader();

        DataTable dt2 = new DataTable();

        dt2.Load(oku2);
        comboBox1.DataSource = dt2;
        comboBox1.DisplayMember = "santiye_ad";
        comboBox1.ValueMember = "idsantiye";
        baglanti.Close();

和

MySqlConnection baglanti = new MySqlConnection("Server=localhost;Database=mydb;Uid=root;Pwd='';");

        baglanti.Open();

        MySqlCommand komut = new MySqlCommand("insert into mydb.malkontrol(tarih,birimtur,harcanan,kalan,santiye_idsantiye,malzemeler_idmalzemeler) VALUES ('" + dateTimePicker1.Text + "','" + degiscekLabel.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + Convert.ToUInt32(comboBox1.Text) + "','" + Convert.ToUInt32(comboBox2.Text)+"')", baglanti);

        MessageBox.Show("Kayıt Başarıyla eklendi");

        komut.ExecuteNonQuery();

        baglanti.Close();

和

MySqlConnection baglanti = new MySqlConnection("Server=localhost;Database=mydb;Uid=root;Pwd='';");

        baglanti.Open();

        string query = "SELECT malzemebirimtur FROM malzemeler WHERE malzemeisim= '" + comboBox2.Text + "'";

        MySqlCommand komut = new MySqlCommand(query, baglanti);

        MySqlDataReader dr = komut.ExecuteReader();

        while (dr.Read())
        {

            degiscekLabel.Text = dr.GetValue(0).ToString();

        }

数据库malkontrol表在此处输入图像描述

我得到这个错误

输入字符串的格式不正确
mysqlcommand komut=new mysqlcommand（“插入mydb.malkontrol（tarih、birimtur、harcanan、kalan、santiye\u idsantiye、malzemeler\u idmalzemeler）值（“+datetimepicker1.text+”、“+degisceklab.text+”、“+textbox3.text+”、“+textbox4.text+”、“+convert.touint32（combobobox1.text）+”、“+convert.touint32（combobox2.text）+”）”），巴格兰蒂）；
我认为两个价值观成员在冲突。一些知情的程序员能解释一下我的错在哪里吗？