Appearance Settings in Windows Forms NumericUpDown (NumericUpDownExt)

Background settings

The Background settings of the NumericUpDownExt control are discussed below.

Background color

The background color of the control can be set using the properties given below.

NumericUpDownExt Property Description
BackColor Specifies the background color of the component.
this.numericUpDownExt1.BackColor = System.Drawing.Color.Aquamarine;
Me.numericUpDownExt1.BackColor = System.Drawing.Color.Aquamarine

Foreground settings

The foreground settings of the NumericUpDownExt control are discussed below.

Foreground color

The foreground color of the control can be set using the properties given below.

NumericUpDownExt Property Description
ForeColor Gets / sets the foreground color of the spin box (also known as an up-down control).
this.numericUpDownExt1.ForeColor = System.Drawing.Color.DodgerBlue;
Me.numericUpDownExt1.ForeColor = System.Drawing.Color.DodgerBlue

Applying foreground color to negative values

It is a good behavior in a NumericUpDownExt control to indicate negative values using a separate color. The IntegerTextBox and DoubleTextBox controls also exhibit the same behavior.

To add this feature to the NumericUpdown control, we need to derive the control. For this, we need to include the below given code snippet in the derived class.

class NumericupdownextDerived : NumericUpDownExt
{
    private IntegerTextBox itb = new IntegerTextBox();
    public NumericupdownextDerived()
    {

// Constructor of the new class.
        foreach(Control c in Controls)
        {
            if(c is TextBox )
            {
                itb.Location=c.Location;
                itb.Size = c.Size;
                itb.Dock = c.Dock;
                itb.Anchor = c.Anchor;
                Controls.Add(itb);
                itb.BringToFront();
                itb.TextChanged += new EventHandler(itb_TextChanged);
            }
        }
    }
    private void itb_TextChanged(object sender,EventArgs e)
    {

// Assigns the IntegerValue.
        Value = itb.IntegerValue;
    }
    public System.Drawing.Color NegativeColor
    {
        get
        {
            return itb.NegativeColor;
        }
        set
        {
            itb.NegativeColor = value;
        }
    }
    protected override void OnValueChanged(EventArgs e)
    {
        itb.Text = Value.ToString();
    }
}
Class NumericupdownextDerived Inherits NumericUpDownExt
Private itb As IntegerTextBox = New IntegerTextBox
Public Sub New()
For Each c As Control In Controls
If TypeOf c Is TextBox Then
itb.Location = c.Location
itb.Size = c.Size
itb.Dock = c.Dock
itb.Anchor = c.Anchor
Controls.Add(itb)
itb.BringToFront
AddHandler itb.TextChanged, AddressOf itb_TextChanged
End If
Next
End Sub
Private Sub itb_TextChanged(ByVal sender As Object, ByVal e As EventArgs)

' Assigns the IntegerValue.
Value = itb.IntegerValue
End Sub
Public Property NegativeColor() As System.Drawing.Color
Get
Return itb.NegativeColor
End Get
Set
itb.NegativeColor = value
End Set
End Property
Protected Overloads Overrides Sub OnValueChanged(ByVal e As EventArgs)
itb.Text = Value.ToString
End Sub
End Class

After deriving the new class, create an object for that class and set the required properties.

NumericupdownextDerived ud = new NumericupdownextDerived();
ud.Location = new Point(200, 200);
ud.Minimum = -100;
ud.NegativeColor = Color.Red;
Controls.Add(ud);
Dim ud As NumericupdownextDerived = New NumericupdownextDerived
ud.Location = New Point(200, 200)
ud.Minimum = -100
ud.NegativeColor = Color.Red
Controls.Add(ud)