Hi Monica,
if you need source, here you go
1) open windows form in
vb.net
2) add colordiaglog control from the toolbar
3) add following script in the form
ColorDialog1.Color = TextBox1.BackColor
ColorDialog1.AllowFullOpen = True
ColorDialog1.ShowDialog()
TextBox1.BackColor = ColorDialog1.Color
4) so you should be able to select color and store it in the database
5) after following above steps, if you get errors let me know
good luck