Handle user number input value condition with ReadOnly false of numericUpDown

Question

In C# WinForms desktop application I use 2 interdependent numericUpDown1 min and numericUpDown2 max value numericUpDown controls:

private void numericUpDown1_ValueChanged(object sender, EventArgs e) 
{
    if (numericUpDown1.Value <= numericUpDown2.Value)
    {
        min = (int)numericUpDown1.Value;
    } 
    else
    {
        numericUpDown1.Value = min - 1;
    }
}

private void numericUpDown2_ValueChanged(object sender, EventArgs e)
{
    if (numericUpDown2.Value >= numericUpDown1.Value)
    {
        max = (int)numericUpDown2.Value;
    }
    else
    {
        numericUpDown2.Value = max + 1;
    }
}

with using of ReadOnly = true; to avoid making the maximal number less than minimal manually from numericUpDown input.:

        min = 20;
        max = 1999;

        numericUpDown1.Value = min;
        numericUpDown2.Value = max;

        numericUpDown1.ReadOnly = true;
        numericUpDown2.ReadOnly = true;

        numericUpDown1.Increment = 1;
        numericUpDown2.Increment = 1;

        numericUpDown1.Maximum = 2000;
        numericUpDown1.Minimum = 1;
        numericUpDown2.Maximum = 2000;
        numericUpDown2.Minimum = 1;

but I use a big range from 1 to 2000, and want to allow the user to change the number of numericUpDown manually with ReadOnly = false;.

I'm trying to figure out, how to control the user input condition with ReadOnly = false; of numericUpDown to avoid the input of maximal number less than minimal or minimal bigger then maximal.

hmmm but it will changed to min / max value on lost focus ... where is the problem ? Just use Minimum and Maximum properties — Selvin
– Selvin, Commented Sep 22, 2021 at 9:38

Shahid Rasheed · Accepted Answer · 2021-09-22 10:17:45Z

0

Try this solution:

First of all Set your numericUpDown property ReadOnly=false or write a line of code in your FormLoad_Function,

numericUpDown1.ReadOnly = false;
numericUpDown2.ReadOnly = false;

Then

private void numericUpDown1_ValueChanged(object sender, EventArgs e) 
{
    if (numericUpDown1.Value > numericUpDown2.Value)
    {
        numericUpDown1.Value = numericUpDown1.Value - 1;
        MessageBox.Show("Min value always less then Max value");
    } 
}

private void numericUpDown2_ValueChanged(object sender, EventArgs e)
{
    if (numericUpDown1.Value > numericUpDown2.Value)
    {
        numericUpDown2.Value = numericUpDown2.Value + 1;
        MessageBox.Show("Max value always greater then Min value");
    } 
}

answered Sep 22, 2021 at 10:17

Shahid Rasheed

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