Gets or sets the value to increment or decrement the spin box (also known as an up-down control) when the up or down buttons are clicked.
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Clicking the up button causes the NumericUpDown.Value property to increment by the amount specified by the NumericUpDown.Increment property and approach the NumericUpDown.Maximum property. Clicking the down button causes the NumericUpDown.Value property to be decremented by the amount specified by the NumericUpDown.Increment property and approach the NumericUpDown.Minimum property.