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Controlling Numericupdown Buttons In Windows Form In .NET

NumericUpDown is a windows control from which user can select the value within the given range.

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When you click on up button value in textbox increases and when click on down button value in textbox decreases. You can add some more functionality in this control.

In this tutorial I will extend the control and make it in such a way that the functionality of up and down button reverses i.e. on click of up button value decreases and on click of down button value increases.

Implementation

To accomplish the task I will create a new class and inherit the class with NumericUpDown class so that we can extend the functionality of the control

public class NumericUpDownExtendedClass: NumericUpDown {}

In the NumericUpDown class the methods which we are going to override are

UpButton() – Method invoked when up button is clicked.
DownButton() – Method invoked when down button is clicked.

So the class code is changed to

public class NumericUpDownExtendedClass: NumericUpDown {
  public override void DownButton() {}
  public override void UpButton() {}
}

It is important to note that if we override the functionality of the buttons then the default functionality is lost. So it is good if we give user an option so that he can switch between the modes i.e. normal mode or the reverse mode.

For that create a property which user can tell the control in which mode he wants that control

public class NumericUpDownExtendedClass: NumericUpDown {
  public enum ControlMode {
    Normal,
    Reverse
  }

  public ControlMode ModeType {
    get;
    set;
  }

  public override void DownButton() {}
  public override void UpButton() {}
}

Here there is ModeType property from which you can select modes.

Now add some code in UpButton() and DownButton() functions. So the code is changed to

public class NumericUpDownExtendedClass: NumericUpDown {
  public enum ControlMode {
    Normal,
    Reverse
  }

  public ControlMode ModeType {
    get;
    set;
  }

  public override void DownButton() {
    if (ModeType == ControlMode.Reverse) {
      if (this.Value < Maximum) {
        this.Value = this.Value + Increment;
        ((NumericUpDown)(this)).Text = this.Value.ToString();
      }
    }
    else {
      base.UpButton();
    }
  }
  public override void UpButton() {
    if (ModeType == ControlMode.Reverse) {
      if (this.Value > Minimum) {
        this.Value = this.Value - Increment;
        ((NumericUpDown)(this)).Text = this.Value.ToString();
      }
    }
    else {
      base.DownButton();
    }
  }
}

Here base.UpButton() and base.DownButton() is for the default behavior of the button.

Now use this class in the form

NumericUpDownExtendedClass extended = new NumericUpDownExtendedClass();
extended.ModeType = NumericUpDownExtendedClass.ControlMode.Reverse;
this.Controls.Add(extended);

You can add some more features using the same method.

Posted By -	Karan Gupta

Posted On -	Friday, December 30, 2011

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