Crystal Report Filtering Using Selection Parameters

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace CrytsalReportsDemo
{
    public partial class CheckNumericUpDown : UserControl
    {
        public CheckNumericUpDown()
        {
            InitializeComponent();
        }
        public delegate void ValueChangedHandler(object sender, EventArgs e);
        public event ValueChangedHandler ValueChanged;
        public decimal MinValue
        {
            get
            {
                return numericUpDown1.Minimum;
            }
            set
            {
                numericUpDown1.Minimum = value;
            }
        }
        public decimal MaxValue
        {
            get
            {
                return numericUpDown1.Maximum;
            }
            set
            {
                numericUpDown1.Maximum = value;
            }
        }
        public decimal Value
        {
            get
            {
                return numericUpDown1.Value;
            }
            set
            {
                numericUpDown1.Value = value;
            }
        }
        public bool Checked
        {
            get
            {
                return checkBox1.Checked;
            }
            set
            {
                checkBox1.Checked = value;
            }
        }

        private void numericUpDown1_ValueChanged(object sender, EventArgs e)
        {
            if (ValueChanged != null)
            {
                ValueChanged(sender, e);
                checkBox1.Checked = true;
            }
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            numericUpDown1.Enabled = checkBox1.Checked;
        }
    }
}