Bind combo box to a simple array of string entries for colors.
private void cmdArray_Click(object sender, System.EventArgs e)
{
string[] myColors = {"AQUA","BLACK","BLUE","GREEN","RED","WHITE","YELLOW"};
ComboBox1.DataSource=myColors;
ComboBox1.SelectedIndex=0;
GroupBox1.Visible=false;
lblSource.Text="Array";
}