if(NumericUpDown1.Text == "")
{
// If the value in the numeric updown is an empty string, replace with 0.
NumericUpDown1.Text = "0";
}
Check if NumericUpDown is empty
-
11-03-2022 - |
Question
How do I check whether the user left a NumericUpDown
control empty, removing the value on it?
So I can reassign it a value of 0.
Solution
OTHER TIPS
It might be useful to use the validated event and ask for the text property
private void myNumericUpDown_Validated(object sender, EventArgs e)
{
if (myNumericUpDown.Text == "")
{
myNumericUpDown.Text = "0";
}
}
Even if the user deleted the content of the numericUpDown
control, its value still remains.
upDown.Text
will be "", but upDown.Value
will be the previous valid value entered.
So my way to 'prevent' the user to leave the control empty, on the onLeave
event, I set:
upDown.Text = upDown.Value.ToString();
decimal d = 0
if(decimal.TryParse(NumericUpDown1.Text, out d)
{
}
NumericUpDown1.Value = d;
Try this
if (string.IsNullOrEmpty(((Control)this.nud1).Text))
{
//null
}
else
{
//have value
}
If you want to forbid empty value for NumericUpDown
, just use this class. Its effect is that once the user tries to erase the control value with select-all + backspace key, the actual numeric value is set again. This is not really an annoyance since the user can still select-all + type a numeric digit to start editing a new numeric value.
sealed class NumericUpDownEmptyValueForbidder {
internal NumericUpDownEmptyValueForbidder(NumericUpDown numericUpDown) {
Debug.Assert(numericUpDown != null);
m_NumericUpDown = numericUpDown;
m_NumericUpDown.MouseUp += delegate { Update(); };
m_NumericUpDown.KeyUp += delegate { Update(); };
m_NumericUpDown.ValueChanged += delegate { Update(); };
m_NumericUpDown.Enter += delegate { Update(); };
}
readonly NumericUpDown m_NumericUpDown;
string m_LastKnownValueText;
internal void Update() {
var text = m_NumericUpDown.Text;
if (text.Length == 0) {
if (!string.IsNullOrEmpty(m_LastKnownValueText)) {
m_NumericUpDown.Text = m_LastKnownValueText;
}
return;
}
Debug.Assert(text.Length > 0);
m_LastKnownValueText = text;
}
}
You can try this:
if(numericUpDown.Value == 0){
MessageBox.Show(
"Please insert a value.",
"Required", MessageBoxButtons.OK,
MessageBoxIcon.Exclamation
);
return;
}