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

namespace LINQtest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            var list = new List<bool> { true, false, true, true, true, true };
            textBox1.Text = list.Count(n => n == true).ToString();
            
        }
    }
}

prog.cs(4,14): error CS0234: The type or namespace name `Data' does not exist in the namespace `System'. Are you missing `System.Data' assembly reference?
prog.cs(9,22): error CS0234: The type or namespace name `Forms' does not exist in the namespace `System.Windows'. Are you missing `System.Windows.Forms' assembly reference?
prog.cs(13,34): error CS0246: The type or namespace name `Form' could not be found. Are you missing an assembly reference?
Compilation failed: 3 error(s), 0 warnings

Standard output is empty