Clearing NumericUpDown

Question

My problem with NumericUpDown control is when the user selects a value from NumericUpDown And unchecks the checkBox1 and clicks the Save button, the value of NumericUpDown not c

Answer 1

I was using the NumericUpDown control without the spinners because I wanted only numbers. The control was in a child dialog that was invoked from a listview selection. When the value to be loaded into the NumericUpDown control was zero in the listwiew, a zero was in the control. That zero always had to be cleared out. Here's how I made it "appear" blank. If it was zero, I change the ForeColor of the control to white. I added an Enter event that changed the ForeColor to black and deleted the zero.

This hid the NumericUpDown control spinners.

AccessCode.Controls[0].Visible = false;

These statements were in the form initialization. (var code was to be loaded into AccessCode)

        if (code == 0)
        {
            AccessCode.ForeColor = Color.White;
        }

The Enter event code looked like this.

    private void AccessCode_Enter(object sender, EventArgs e)
    {
        if (AccessCode.ForeColor == Color.White)
        {
            AccessCode.ForeColor = Color.Black;
            AccessCode.Focus();
            SendKeys.SendWait("{Delete}");
        }
    }

The AccessCode control also had a Leave event that checked for valid data.

Answer 2

NumericUpDown does not contain string. It has value as numbers. So it should be:

Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
      If CheckBox1.Checked = False Then
            AgeNumericUpDown.Value = 0
      End If
End Sub

EDIT:

Check this out then if you don't want the value to be zero, but empty!

 Private Sub BttnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BttnSave.Click
    If AgeNumericUpDown.Value <> 0 Then
        AgeNumericUpDown.Controls(1).Text = ""
    End If
End Sub

Answer 3

Access the text control of the NumericUpDown and then set text to be blank

Private Sub CheckBox1_CheckedChanged(sender As System.Object, e As System.EventArgs) Handles CheckBox1.CheckedChanged

    If CheckBox1.Checked = False Then
        AgeNumericUpDown.Controls.Item(1).Text = ""
    End If

End Sub