C#

//Connection string to DB.
OleDbConnection dbCon = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\"" + "NGDemoSetup.mdb" + "\"");

//Dataset for majority of data
DataSet ds = new DataSet();

//Dataset for the combobox
DataSet cboDs = new DataSet();

//Create a DGVComboBoxColumn to hold the Types we have in the ADDRESSTYPES Table of the DB.
DataGridViewComboBoxColumn cboCol = new DataGridViewComboBoxColumn();

//Open the DB.
dbCon.Open();

//Grab all the data we need from the Location Info table
OleDbDataAdapter da = new OleDbDataAdapter("SELECT AddrType,isRange,Value1,Value2 FROM LOCATIONINFO", dbCon);

//Grab all the columns from ADDRESSTYPES (ID and Types).
OleDbDataAdapter cboDa = new OleDbDataAdapter("SELECT * FROM ADDRESSTYPES", dbCon);

da.Fill(ds, "LocationInfo");
cboDa.Fill(cboDs, "AddressTypes");

cboCol.Width = 100;
cboCol.DataSource = cboDs.Tables[0];

cboCol.ValueMember = "ID";
cboCol.DisplayMember = "Type";
DataTable dt = ds.Tables["LocationInfo"];

grdAddressInfo.DataSource = dt;

/*
 * Somehow make the ComboBox Column display the correct Dropdown object
 * Based upon the AddrType field.
 */

//Column formatting
grdAddressInfo.Columns.Insert(0, cboCol);
grdAddressInfo.Columns[0].HeaderText = "Address Type";
grdAddressInfo.Columns[1].HeaderText = "Ranged Value";
grdAddressInfo.Columns[2].HeaderText = "From";
grdAddressInfo.Columns[3].HeaderText = "To";

dbCon.Close();