C# WinApp DataGridViewLinkCell หรือ DataGridViewTextboxCell ก็ได้ อยากแยกรับข้อความจาก SQL ครับ

public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
            LoadData();
        }

        public void LoadData() {
            var listFile = System.IO.Directory.GetFiles(@"c:\windows").Select(s => new { 
                FilePath = s ,
                FileName = System.IO.Path.GetFileName(s)
            }).ToList();
            
            var colFilePath = new DataGridViewTextBoxColumn();
            colFilePath.DataPropertyName = "FilePath";
            colFilePath.HeaderText = "FilePath";

            var colFileName = new DataGridViewTextBoxColumn();
            colFileName.DataPropertyName = "FileName";
            colFileName.HeaderText = "FileName";

            var colCustom = new customCol();
            colCustom.DataPropertyName = "FilePath";
            colCustom.HeaderText = "CustomFilePath";
            colCustom.Width = 500;

            dgv1.AutoGenerateColumns = false;
            dgv1.Columns.AddRange(colFileName, colFilePath, colCustom);

            dgv1.DataSource = listFile;
        }

        class customCell : DataGridViewTextBoxCell
        {
            protected override object GetValue(int rowIndex)
            {
                string strValue = base.GetValue(rowIndex).ToString();
                if (!this.Selected)
                {
                    return System.IO.Path.GetFileName(strValue);
                }
                else
                {
                    return strValue;
                }
            }
        }

        class customCol : DataGridViewTextBoxColumn
        {
            public customCol()
            {
                this.CellTemplate = new customCell();
            }
        }
    }