Drag Drop Coding in C#.net

For drop:
For drag and drop:
1) Set the AllowDrop property of your form to True
2) Create a handler for both the DragEnter and DragDrop events of your form.
3) In the DragEnter handler, add the following line of code:

e.Effect = DragDropEffects.Move;

4) In the DragDrop handler, add the following:

string[] files = (string[]) e.Data.GetData(DataFormats.FileDrop);
if (files != null)
    {
    foreach (string file in files)
        {
        Console.WriteLine(file); // Or whatever you need to do...
        }
    }

(this shows file drop, there are other formats available)

For Drag:
Handle MouseMove and create a StringCollection, then the DataObject, then do the DragDrop:

private void dgvTracks_MouseMove(object sender, MouseEventArgs e)
    {
    DataGridView dgv = sender as DataGridView;
    System.Collections.Specialized.StringCollection filePath = new System.Collections.Specialized.StringCollection();
    foreach (DataGridViewRow row in dgv.SelectedRows)
        {
        filePath.Add((string)row.Cells["Path"].Value);
        }
    DataObject dataObject = new DataObject();
    dataObject.SetFileDropList(filePath);
    dgv.DoDragDrop(dataObject, DragDropEffects.Copy);
    }

This provides a list of files from a DataGridView.
It's a similar procedure depending on what you want to drag out of your control(s)