C#

this.cbCountyDefault.BeginUpdate();
for (int i = 0; i < m_saCountyRecords.Count; i++)
{
	GASTCountyRecord objRecord = (GASTCountyRecord)m_saCountyRecords[i];
	this.cbCountyDefault.Items.Add(objRecord);
}

this.cbCountyDefault.SelectedIndex = 0;
this.cbCountyDefault.EndUpdate();

MessageBox.Show(cbCountyDefault.SelectedItem.ToString());
MessageBox.Show(((GASTCountyRecord)this.cbCountyDefault.SelectedItem).ToString());

public class GASTCountyRecord : object
{
    public string m_strCode;
    public string m_strName;

    public GASTCountyRecord(string strCode, string strName)
    {
        m_strCode = strCode;
        m_strName = strName;
    }

    public string ToString()
    {   return m_strName;   }
}

public class GASTCountyRecord : object
{
    public string m_strCode;
    public string m_strName;

    public GASTCountyRecord(string strCode, string strName)
    {
        m_strCode = strCode;
        m_strName = strName;
    }

    public override string ToString()
    {   return m_strName;   }
}

AppDomain appd = AppDomain.CreateDomain("Plugins");

foreach(Plugin File.....)
{
Assembly a = appd.Load(fileName);
}

for(int i = 0; i < 5;i++)
{
    TabPage tbpage = new TabPage("test" + i);
    this.tabControl1.TabPages.Add(tbpage);
}