DataGridView .bmp not showing

Question

Hi all,

 

I'm trying to create AutoCAD add-in to preview .bmp files

 

I have snippet code to do the following 

- Tow ListBoxis binded together. the first one show directory and the second show subfolder. 

- DataGridView to show the .bmp files.

private void Form1_Load(object sender, EventArgs e)
{
    listBox1.DataSource = Directory.GetDirectories(rootDirectory).Select(Path.GetFileName).ToList();
    listBox1.SelectedIndexChanged += ListBox1_SelectedIndexChanged;
    listBox2.SelectedIndexChanged += ListBox2_SelectedIndexChanged;

    DataGridViewImageColumn dgvimgcol = new DataGridViewImageColumn();
    dgvimgcol.ImageLayout = DataGridViewImageCellLayout.Stretch;
    dgvimgcol.Width = 250;
    dgvimgcol.HeaderText = "Blocks";
    dataViewImages.RowTemplate.Height = 300;
    dataViewImages.Columns.Add(dgvimgcol);
    dataViewImages.AllowUserToAddRows = false;
    dataViewImages.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
}

and i got this  

- I need to Set only one colomn (Blocks).

- add double click event to insert the dwg file.