How do I set datasource for two comboboxes on the same form, from two columns of the same table

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C#

I have designed a Windows form application with two comboboxes. I want combobox1 to take its contents from a column named "Type" in table "BIn" and combobox2 to take its contents from a column named "PN" in table "BIn". I already solved the case of a single input.but this is double input.I can't seem to be able to successfully extend the single input solution.

What I have tried:

public B()
{
InitializeComponent();

SqlConnection con = new SqlConnection("Data Source=PV10\\LOCALSERVER;Initial Catalog=SmallSoftwareDB;Integrated Security=True;Pooling=False");
con.Open();
string sPn = "select PN from BIn";
string sTp = "select Type from BIn";
SqlCommand CsPn = new SqlCommand(sPn, con);
SqlCommand CsTp = new SqlCommand(sTp, con);

SqlDataReader mDr;
SqlDataReader CmDr;
mDr = CsPn.ExecuteReader();

while (mDr.Read())
{
comboBox2.Items.Add(mDr["PN"].ToString());
}

using (SqlDataAdapter da = new SqlDataAdapter(CsTp))
{
DataTable dt = new DataTable();
da.Fill(dt);
comboBox1.DataSource = dt;
comboBox1.DisplayMember = "Type";
}
}