CSL_Test__1.MainWindow.dataGridView_DragEnter C# (CSharp) Method

        private void dataGridView_DragEnter(object sender, DragEventArgs e)
        {
            // make sure they're actually dropping files
            if (e.Data.GetDataPresent(DataFormats.FileDrop, false) == true)
                // allow them to continue
                // (without this, the cursor stays a "NO" symbol)
                e.Effect = DragDropEffects.All;
        }