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public Winterreifen()
        {
            InitializeComponent();
            comboMarke.Items.Add("Dunlop");
            comboMarke.Items.Add("Semperit");
            comboMarke.Items.Add("Continental");
            comboMarke.Items.Add("Michelin");
            comboMarke.Items.Add("Kumho");
            comboMarke.Items.Add("Kleber");
            comboMarke.Items.Add("Bridgestone");
            comboMarke.Items.Add("Firestone");
            comboMarke.Items.Add("Good Year");
            comboMarke.Items.Add("Fulda");
            comboMarke.Items.Add("Pirelli");

            comboDimension.Items.Add("195/ 65 R15");
            comboDimension.Items.Add("205/ 55 R16");
            button1.Enabled = true;
        }					

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private void button1_Click(object sender, EventArgs e)
        {
            con.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Family\Documents\Winterreifen.accdb;Persist Security Info=False;";
            cmd.Connection = con;
            cmd.CommandText = "select * from ReifenDetail where HerstellerID like '" + comboMarke.Text + "' and Dimension like '" + comboDimension.Text + "'";
            try
            {
                con.Open();

                reader = cmd.ExecuteReader();
                listBox1.Items.Clear();

                while (reader.Read())
                {
                    listBox1.Items.Add(
                        reader["HerstellerID"] + "\t" + 
                        reader["Profilname"] + "\t" + 
                        reader["Dimension"] + "\t" +
                        reader["Tragkraft"] + "\t" +
                        reader["Geschwindigkeitsindex"] + "\t" +
                        reader["Aktionspreis"] + "\t" +
                        reader["FA1Preis"] + "\n");                       
                }

                reader.Close();
                con.Close();
            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.Message);

            }
            finally
            {
                con.Close();
            }
        }					

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private void button2_Click(object sender, EventArgs e)
        {
            con.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Family\Documents\Winterreifen.accdb;Persist Security Info=False;";
            cmd.Connection = con;
            cmd.CommandText = "select * from ReifenDetail where HerstellerID like '" + comboMarke.Text + "' and Dimension like '" + comboDimension.Text + "'";
            
            try
            {
                con.Open();

                reader = cmd.ExecuteReader();
                listBox1.Items.Clear();

                while (reader.Read())
                {

                    textBox1.Text = "" + reader["HerstellerID"];
                    textBox2.Text = "" + reader["Profilname"];
                    textBox3.Text = "" + reader["Dimension"];
                    textBox4.Text = "" + reader["Tragkraft"];
                    textBox5.Text = "" + reader["Geschwindigkeitsindex"];
                    textBox6.Text = "" + reader["Aktionspreis"];
                    textBox7.Text = "" + reader["FA1Preis"];
                    textBox8.Text = "" + reader["HerstellerID"];
                    textBox9.Text = "" + reader["Profilname"];
                    textBox10.Text = "" + reader["Dimension"];
                    textBox11.Text = "" + reader["Tragkraft"];
                    textBox12.Text = "" + reader["Geschwindigkeitsindex"];
                    textBox13.Text = "" + reader["Aktionspreis"];
                    textBox14.Text = "" + reader["FA1Preis"];
                    textBox15.Text = "" + reader["HerstellerID"];
                    textBox16.Text = "" + reader["Profilname"];
                    textBox17.Text = "" + reader["Dimension"];
                    textBox18.Text = "" + reader["Tragkraft"];
                    textBox19.Text = "" + reader["Geschwindigkeitsindex"];
                    textBox20.Text = "" + reader["Aktionspreis"];
                    textBox21.Text = "" + reader["FA1Preis"];

                    
                }

                reader.Close();
                con.Close();
               
            }
            catch (Exception ex)
            {

                MessageBox.Show(ex.Message);

            }
            finally
            {
                con.Close();
            }

        }