Color Dialog
To provide the Color dialog box to your application on the Toolbox, you can click the ColorDialog button and click anywhere on the form. The Color dialog box is implemented through the ColorDialog class.
ShowDialog()method
To display the dialog box to the user, call the ShowDialog() method.
FullOpen property:
You can control the regular or full size of the dialog using the Boolean FullOpen property. When its value is False, which is the default, the dialog appears regularly. If you want it to appear in its full size, set this property to True.
For example:
click the ColorDialog button from toolbox and take two control text box and button to the form and make the multiline textbox.
Now, double click on the button named color in the form
and write the following code.
Private Sub cmdColor_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdColor.Click
ColorDialog1.FullOpen = True
ColorDialog1.ShowDialog()
textBox4.ForeColor = ColorDialog1.Color
End Sub

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