How do I disable a button when the value in the NumericUpDown control is greater than a certain number?

Question

The button only disables after I click on it. I want it to disable without any interaction as soon as the value in the NumericUpDown control is incremented above a specific point. I have goggled but found no answers, here is my code:

    private void mybtn_Click(object sender, EventArgs e)
    {            
        if (numericud.Value > myArray[r, c] || myArray[r, c] == 0)
            DisableButton(mybtn);            
        myArray[r, c] = CalcNewMax(myArray[r, c]);
        OpenNewForm();
    }

    private void DisableButton(Button selectedbtn)
    {
        selectedbtn.Enabled = false;
    }

Any help is much appreciated, thanks!

Your code should already work, assuming that mybtn.Enabled = false; is executing. It would be clearer if you surrounded that line of code with braces. — Robert Harvey
– Robert Harvey, Commented Nov 7, 2012 at 19:08
dont get discouraged by negative votes. could u elaborate on the code part?? — aromore
– aromore, Commented Nov 7, 2012 at 19:12
I voted to re-open because it appears as though the author has an actual problem, and could make an answerable question if he edits — Sam I am says Reinstate Monica
– Sam I am says Reinstate Monica, Commented Nov 7, 2012 at 19:15

Sam I am says Reinstate Monica · Accepted Answer · 2012-11-07 19:48:20Z

3

Here's some code that works for a specific example.

I don't see any specific problems with your code, so if I were you, I'd put some breakpoints in to make sure that your condition is fulfilled, and that everything is proceeding as you think it is.

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void numericUpDown1_ValueChanged(object sender, EventArgs e)
        {
            if (numericUpDown1.Value > 5)
                button1.Enabled = false;
        }
    }
}

As an additional note, Visual Studio will automatically generate the numericUpDown1_ValueChanged handler when you double-click on the UpDown control in the designer

answered Nov 7, 2012 at 19:48

Sam I am says Reinstate Monica

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2 Comments

Tony Over a year ago

Lol, found the answer and went to respond but got network error and yours was already here.. i agree with this one :)

JeliBeanMachine Over a year ago

Thanks for that, I'm still pretty new to programming and it was a rather naive mistake for me to make. The code was just being handled by the wrong event; it was being executed after the actual button Click and not the ValueChanged.

AlexSavAlexandrov · Accepted Answer · 2012-11-07 20:07:51Z

1

I think you are calling the method "mybtn_Click()" when the button gets clicked, not when the value of the numeric up-down changes. In the "Events" part of the properties of the button check out if the "MouseClick" event is set to call "mybtn_Click()".

Afterwards go to the "Events" part of the properties of the numeric up-down and set the "ValueChanged" event to call "mybtn_Click()". I also advise you to change the name of the method to a more suitable one before that.

And lastly, you don't need to make a whole new method for simply changing the Enabled value of the button: simply replace the line

DisableButton(mybtn);

with

mybtn.Enabled = false;

answered Nov 7, 2012 at 20:07

AlexSavAlexandrov

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1 Comment

JeliBeanMachine Over a year ago

I just noticed that myself from looking at the previous example but thanks for replying at least now i know what's wrong.

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