Question

I’ve searched the web and was unable to find what I am looking for. I’m using VS2010 and trying to make a w7p app. I’m trying to make a textbox that only accepts a single integer value from 0 to 5, so no negative and no decimal as any value higher crashes the app. Thank you!

Answer 1

Use a NumericUpDown control, if there is one and you can just set the Minimum and Maximum properties.

If there’s not, use this in the KeyDown event of the textbox:

List<Keys> allowedKeys = new List<Keys>()
{
    Keys.Back, Keys.D0, Keys.D1, Keys.D2, Keys.D3, Keys.D4, Keys.D5,
    Keys.NumPad0, Keys.NumPad1, Keys.NumPad2, Keys.NumPad3, Keys.NumPad4, Keys.NumPad5
};

e.SuppressKeyPress = !allowedKeys.Contains(e.KeyCode);

This will suppress anything that is not a 0-5 or BACKSPACE key. Also, set your Maximum Length property to 1, it will allow only 0 through 5.