Member Avatar for JDenham377

Hi, I am trying to disable a button until a condition is met in my program.

I have two numeric up down boxes and a button, but I want to have the button disabled until the two numeric up down boxes have a number higher than 0 in both of them.

Grateful for any help.

Thanks.

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  • Latest Post Latest Post by Mitja Bonca

Dani AI

Generated

Both replies are on the right track: re-check the numeric controls whenever their value changes and flip the button's Enabled state accordingly. Two small problems to note from the posted code: initializes value variables once (so they never update) and uses Visible instead of Enabled; 's routine inverts the logic (it disables the button when both values are > 0) and does not ensure the button is set correctly on startup.

A compact, reliable pattern is to wire both controls to the same handler and evaluate the current Value properties each time. Initialize the button state when the form is created so the UI matches the controls' initial values.

public Form1()
{
    InitializeComponent();
    numericUpDown1.ValueChanged += (_,__) => RefreshButton();
    numericUpDown2.ValueChanged += (_,__) => RefreshButton();
    RefreshButton();
}

void RefreshButton()
{
    // use 0m to make the literal decimal
    button1.Enabled = (numericUpDown1.Value > 0m && numericUpDown2.Value > 0m);
}

Notes and quick checks: confirm the ValueChanged events are actually wired (designer vs. code), consider setting Minimum on the controls to avoid negatives, use 0m for decimal comparisons, and call the update method on form load so the initial state is correct. For clearer UX, show a ToolTip or ErrorProvider explaining why the button is disabled.

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Member Avatar for jlivvers

you could use the valueChanged event of the controls to check what the value in each one is?

Something like

btn.visible = false;
decimal upDnVal1 = UpDn1.Value;
decimal upDnVal2 = UpDn2.Value;

private void UpDn1_ValueChanged(object sender, EventArgs e)
{   
   if(upDnVal1 > 0 && upDnVal2 > 0){
   btn.visible = true;
}

and then have the same check for the event for the other up down control.

hope that helps.

Hi, I am trying to disable a button until a condition is met in my program.

I have two numeric up down boxes and a button, but I want to have the button disabled until the two numeric up down boxes have a number higher than 0 in both of them.

Grateful for any help.

Thanks.

Member Avatar for Mitja Bonca

This should do the trick:

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

        private void numericUpDown1_ValueChanged(object sender, EventArgs e)
        {
            DisablingButton();
        }

        private void numericUpDown2_ValueChanged(object sender, EventArgs e)
        {
            DisablingButton();
        }

        private void DisablingButton()
        {
            decimal value1 = numericUpDown1.Value;
            decimal value2 = numericUpDown2.Value;
            if (value1 > 0 && value2 > 0)
                button1.Enabled = false;
            else
                button1.Enabled = true;
        }
    }

Hope it helps,
Mitja

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