Displaying queried fields based on combobox selection

Question

Hi all, I'm trying to populate 3 textboxes based on the combobox value.  As you can see, it's not that straight forward. I first popuate the combobox with contacenated values to form an address which is distinct.  Then, upon button click, I need to query for the value of 3 other fields based on this selection.  The SQL gets kind of interesting because I have to concatenate the fields.  The combobox is populating fine, but nothing is displayed in the textboxes when changing its value.  I am a novice with c# so your help is greatly appreciated.

private void Form1_Load(object sender, EventArgs e)
{
   using (SqlConnection conn = new SqlConnection(@"Data Source=######;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False"))
   {
       try
       {
           string query = "SELECT DISTINCT direction + ' ' + street + ' ' + city + ', ' + state + ' ' + zip as 'Address' FROM ###.DBO.#### order by address";
           SqlCommand cmd = new SqlCommand(query,conn);
           SqlDataAdapter da = new SqlDataAdapter(query, conn);
           conn.Open();
           DataTable dt = new DataTable();
           da.Fill(dt);
           cboAddress.DataSource = dt;
           cboAddress.ValueMember = "Address";
           cboAddress.DisplayMember = "Address";
           conn.Close();
       }
       catch (Exception)
       {
           MessageBox.Show("Error loading addresses");
       }
   }
}
private void cboAddress_SelectionChangeCommitted(object sender, EventArgs e)
{
    using (SqlConnection conn = new SqlConnection(@"Data Source=scsqllistener;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False"))
    {
        try
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand("select geo_primary_area, geo_law_sub1, geo_law_sub2 from cad.dbo.cadgeo where direction + ' ' + street + ' ' + city + ', ' + state + ' ' + zip = @addr", conn);
            cmd.Parameters.AddWithValue("@addr", cboAddress.DisplayMember);
            SqlDataReader myreader = cmd.ExecuteReader();
            while (myreader.Read())
            {
                textBox1.Text = myreader["geo_primary_area"].ToString();
                textBox2.Text = myreader["geo_law_sub1"].ToString();
                textBox3.Text = myreader["geo_law_sub2"].ToString();
            }
            myreader.Close();
            myreader.Dispose();
            conn.Close();
        }
        catch (Exception)
        {
            MessageBox.Show("Error retrieving values");
        }
    }
}