ExampleSummaryForm.cs

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

namespace ExampleWindowsApplication
{
    public partial class ExampleSummaryForm : Form
    {
        private List<Example> exampleList;

        public ExampleSummaryForm()
        {
            InitializeComponent();
        }

        private void ExampleSummaryForm_Load(object sender, EventArgs e)
        {  
            DesktopDBEntities db = new DesktopDBEntities();
            exampleList = db.Examples.ToList();
            exampleGridView.DataSource = exampleList;

        }

        private void button1_Click(object sender, EventArgs e)
        {
            double exampleValueCriteron = Convert.ToDouble(exampleValueFilterTextBox.Text);
            exampleGridView.DataSource = exampleList.Where(ex => ex.ExampleValue > exampleValueCriteron).ToList();
        }
    }
}