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private void button1_Click(object sender, RoutedEventArgs e)
        {
            using (OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=C:\Users\hmprak\Documents\prakdb1(backup).accdb; Mode=12"))
            {
                conn.Open();
                using (OleDbCommand cmd = new OleDbCommand(@"INSERT INTO tbladress(fldname01, fldname02, fldname03, 
                            fldstrasse, fldplz, fldnort, fldland, fldtelefon, fldemail) VALUES (@Name01, @Name02, @Name03, 
                            @Straße, @Plz, @Ort, @Land, @Telefon, @Email)", conn))
                {
                    cmd.Parameters.AddWithValue("@Name01", textBox2.Text);
                    cmd.Parameters.AddWithValue("@Name02", textBox3.Text);
                    cmd.Parameters.AddWithValue("@Name03", textBox4.Text);
                    cmd.Parameters.AddWithValue("@Strasse", textBox5.Text);
                    cmd.Parameters.AddWithValue("@Plz", textBox6.Text);
                    cmd.Parameters.AddWithValue("@Ort", textBox7.Text);
                    cmd.Parameters.AddWithValue("@Land", textBox8.Text);
                    cmd.Parameters.AddWithValue("@Telefon", textBox9.Text);
                    cmd.Parameters.AddWithValue("@Email", textBox10.Text);
                    cmd.ExecuteNonQuery();
                }
                conn.Close();
            }
        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            using (OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=C:\Users\hmprak\Documents\prakdb1(backup).accdb; Mode=12"))
            {
                conn.Open();
                using (OleDbCommand cmd = new OleDbCommand(@"INSERT INTO tblinvoiceheader(fldnummer, fldadressid, fldname01,
                fldname02, fldname03, fldstrasse, fldplz, fldnort, fldland, fldtelefon, fldemail, fldanschreiben, fldnetto,
                fldmwst, fldbrutto, fldtextintern) VALUES (@Nummer, @AdressID, @Name01, @Name02, @Name03, @Straße, @Plz,
                @Ort, @Land, @Telefon, @Email, @Anschreiben, @Netto, @Mwst, @Brutto, @TextI)", conn))
                {
                    cmd.Parameters.AddWithValue("@Nummer", textBox12.Text);
                    cmd.Parameters.AddWithValue("@AdressID", textBox13.Text);
                    cmd.Parameters.AddWithValue("@Name01", textBox14.Text);
                    cmd.Parameters.AddWithValue("@Name02", textBox15.Text);
                    cmd.Parameters.AddWithValue("@Name03", textBox16.Text);
                    cmd.Parameters.AddWithValue("@Straße", textBox17.Text);
                    cmd.Parameters.AddWithValue("@Plz", textBox18.Text);
                    cmd.Parameters.AddWithValue("@Ort", textBox19.Text);
                    cmd.Parameters.AddWithValue("@Land", textBox20.Text);
                    cmd.Parameters.AddWithValue("@Telefon", textBox21.Text);
                    cmd.Parameters.AddWithValue("@Email", textBox22.Text);
                    cmd.Parameters.AddWithValue("@Anschreiben", textBox23.Text);
                    cmd.Parameters.AddWithValue("@Netto", textBox24.Text);
                    cmd.Parameters.AddWithValue("@Mwst", textBox25.Text);
                    cmd.Parameters.AddWithValue("@Brutto", textBox26.Text);
                    cmd.Parameters.AddWithValue("@TextI", textBox27.Text);
                    cmd.ExecuteNonQuery();
                }
                conn.Close();
            }
        }

        private void button4_Click(object sender, RoutedEventArgs e)
        {
            using (OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=C:\Users\hmprak\Documents\prakdb1(backup).accdb; Mode=12"))
            {
                conn.Open();
                using (OleDbCommand cmd = new OleDbCommand(@"INSERT INTO tblinvoicedetails(fldmasterid, fldpos, fldanzahl, 
                fldtext, fldpreis, fldrabatt, fldgesamt, fldtextintern) VALUES (@MasterID, @Pos, @Anzahl, @Text, @Preis, 
                @Rabatt, @Gesamt, @TextI)", conn))
                {
                    cmd.Parameters.AddWithValue("@MasterID", textBox29.Text);
                    cmd.Parameters.AddWithValue("@Pos", textBox30.Text);
                    cmd.Parameters.AddWithValue("@Anzahl", textBox31.Text);
                    cmd.Parameters.AddWithValue("@Text", textBox32.Text);
                    cmd.Parameters.AddWithValue("@Preis", textBox33.Text);
                    cmd.Parameters.AddWithValue("@Rabatt", textBox34.Text);
                    cmd.Parameters.AddWithValue("@Gesamt", textBox35.Text);
                    cmd.Parameters.AddWithValue("@TextI", textBox36.Text);
                    cmd.ExecuteNonQuery();
                }
                conn.Close();
            }
        }