Here I have got a few codes from my archived collection...
May be it will help you.
private System.Windows.Forms.DataGridView Localdg;
private System.Windows.Forms.ListBox Plist;
int crcnt = Localdg.Rows.Add();
Localdg.Rows[crcnt].Cells[0].Value = "Hello";
Localdg.Rows[crcnt].Cells[1].Value = "World";
foreach (DataGridViewRow DelR in Localdg.Rows)
{
try
{
Plist.Items.Add(DelR.Cells[0].Value.ToString() + " , " + DelR.Cells[1].Value.ToString() );
}
catch { }
}
Its just a little reference for your problem.. :)
EDIT: Sorry,I have given you this code for listBox, you can modify accordingly for dropdownlist.