Ensure there is always a value in NumericUpDown?

This has been a pain and I'm at a loss. With

NumericUpDown

NumericUpDown

forms, it is possible to make the form have no content by pressing backspace or whatever weird way a user has come up with.

I can't see a way to make sure the form always has a numerical value? I tried adding this function as an event handler for OnLeave, OnEnter, and ValueChanged:

public void EnsureNumericHasNumber (object sender, EventArgs e)
{

    NumericUpDown numCurrent = (NumericUpDown)sender;

    if (numCurrent.Text == "")
    {
        numCurrent.Value = 0;
    }

}
...

numCurrent.Enter += EnsureNumericHasNumber;
numCurrent.Leave += EnsureNumericHasNumber;
numCurrent.ValueChanged += EnsureNumericHasNumber;

public void EnsureNumericHasNumber (object sender, EventArgs e)
{

    NumericUpDown numCurrent = (NumericUpDown)sender;

    if (numCurrent.Text == "")
    {
        numCurrent.Value = 0;
    }

}
...

numCurrent.Enter += EnsureNumericHasNumber;
numCurrent.Leave += EnsureNumericHasNumber;
numCurrent.ValueChanged += EnsureNumericHasNumber;

C#•8mo ago•

22 replies

FiftyTifty

Ensure there is always a value in NumericUpDown?

This has been a pain and I'm at a loss. With

NumericUpDown

NumericUpDown

public void EnsureNumericHasNumber (object sender, EventArgs e)
{

    NumericUpDown numCurrent = (NumericUpDown)sender;

    if (numCurrent.Text == "")
    {
        numCurrent.Value = 0;
    }

}
...

numCurrent.Enter += EnsureNumericHasNumber;
numCurrent.Leave += EnsureNumericHasNumber;
numCurrent.ValueChanged += EnsureNumericHasNumber;

public void EnsureNumericHasNumber (object sender, EventArgs e)
{

    NumericUpDown numCurrent = (NumericUpDown)sender;

    if (numCurrent.Text == "")
    {
        numCurrent.Value = 0;
    }

}
...

numCurrent.Enter += EnsureNumericHasNumber;
numCurrent.Leave += EnsureNumericHasNumber;
numCurrent.ValueChanged += EnsureNumericHasNumber;

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