Visual Studio/Windows Forms Application > DataGridView > 열 너비 변경 > 지정/자동 조정

Windows 7 Pro (32bit)
Microsoft Visual Studio 2017 Community
Sublime Text 2

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;
using System.IO; 

namespace _170421_helloWorld
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Shown(object sender, EventArgs e)
        {
            string alist = "data1,data2,data3";
            string[] elem = alist.Split(',');
            for(int idx=0; idx<3; idx++)
            {
                dataGridView1.Rows.Add(elem);
            }
        }

        private void B_narrower_Click(object sender, EventArgs e)
        {
            dataGridView1.Columns[1].Width -= 20; 
        }

        private void B_autosize_Click(object sender, EventArgs e)
        {
            dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
        }
    }
}