NumericUpDown allows user to type a number greater than maximum

Question

I have a NumericUpDown variable in my class. The minimum and maximum values are set as follows:

myNumericUpDown.Maximum = 9999;
myNumericUpDown.Minimum = 0;

This prevents the spin box from exceeding 9999 or going below 0.

The problem I am having is when the user types inside the text box they can type any arbitrary number greater than Maximum or less than Minimum.

Is there a property in the NumericUpDown class that controls the minimum and maximum values for the text box? Or do I have to write a callback procedure that checks for this condition?

Answer 1

If you set the property in the properties pane in the forms design view it will handle this for you. If the user were to enter 12000 and you had a maximum of 9999, as soon as the control loses focus the control drops to its maximum value of 9999. It goes the same with a negative value. It would automatically go to 0 once the control loses focus.

If you didn't want a user to be able to enter more than 4 digits, then you could just watch the KeyDown Event.

    /// <summary>
    /// Checks for only up to 4 digits and no negatives
    /// in a Numeric Up/Down box
    /// </summary>
    private void numericUpDown1_KeyDown(object sender, KeyEventArgs e)
    {
        if (!(e.KeyData == Keys.Back || e.KeyData == Keys.Delete))
            if (numericUpDown1.Text.Length >= 4 || e.KeyValue == 109)
            {
                e.SuppressKeyPress = true;
                e.Handled = true;
            }
    }