Use..
cmbCompName.Insert(0,"Select Option");
Or,
cmbCompName.Items.Insert(0, new ListItem("-Select Option-", "0"));
Or,
In form load event write something like..
cmbCompName.Text = "Select Option";
And in the
TextChanged event of the comboBox write the following code..
private void cmbCompName_TextChanged(object sender, EventArgs e)
{
if (cmbCompName.SelectedIndex < 0)
{
cmbCompName.Text = "Select Option";
}
else
{
cmbCompName.Text = cmbCompName.SelectedText;
}
}