private void 撮り直しRToolStripMenuItem_Click(object sender, EventArgs e)
{
if (thumbNailView.SelectedItems.Count <= 0) return;
var targetName = thumbNailView.SelectedItems[0].Text;
var imageName = new BlackForm().takeScreenshot(this);
var bmp = DeleteScreenshot(imageName);
if (bmp == null) return;
AddScreenshot(targetName, bmp);
textBox.Refresh();
}