C#

private void Main_DragEnter(object sender, DragEventArgs e)
{
    e.Effect = DragDropEffects.Copy;
}
private void Main_DragDrop(object sender, DragEventArgs e)
{
    string[] DroppedFilesNames = (string[])e.Data.GetData(DataFormats.FileDrop);
    if (Path.GetFileName(DroppedFilesNames[0]) != "carcols.dat")
        MessageBox.Show("Wrong file.", Application.ProductName);
    else
        openFile(DroppedFilesNames[0]);
}

Eddy Vluggen wrote:

if you're drinking a beer, then it's impossible for me to replace the glass that you're using to hold that beer.

criteria.SetProjection(Projections.RowCount());
int totalRecordsFound = (int)criteria.UniqueResult();