How do I change the value of each combobox items in C#?

private void comboBox1_SelectedIndexChanged_1(object sender, EventArgs e)
        {
            if (comboBox1.Text == "Mr") { comboBox1.SelectedValue = "1"; }
            if (comboBox1.Text == "Mrs") { comboBox1.SelectedValue = "2"; }
        } 

private void button1_Click(object sender, EventArgs e)
        {
            
           
            try
            {
                OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\dropdown.accdb; Persist Security Info = True");
                OleDbCommand cmd = con.CreateCommand();
                con.Open();
                cmd.CommandText = "INSERT INTO dropdown([AS_TITLE],[Name]) VALUES ('" + comboBox1.SelectedValue + "','" + textBox1.Text + "')";
                
                cmd.Connection = con;
                cmd.ExecuteNonQuery();

                
                
            MessageBox.Show("Successfully Uploaded");
                con.Close();
                
            }


            catch (Exception ee)
            {
                MessageBox.Show(ee.Message);
            }