Hi David,

Thanks for your post.

What you want is the windows shell drag&drop support. Currently, there is
no build-in support for doing shell drag&drop in Winform. However, we can
p/invoke some Shell API to get this done.

Below is a little sample I wrote to demonstrate what you want(we can place
this code snippet in any form class):

private const int  WS_EX_ACCEPTFILES=0x00000010;
protected override CreateParams CreateParams
{
    get
    {
        CreateParams cp=base.CreateParams;
        cp.ExStyle=cp.ExStyle|WS_EX_ACCEPTFILES;
        return cp;
    }
}

[DllImport("shell32.dll", CharSet=CharSet.Auto)]
public static extern int DragQueryFile(IntPtr hDrop, int iFile,
StringBuilder lpszFile, int cch);

[DllImport("shell32.dll")]
static extern void DragFinish(IntPtr hDrop);

private const int  WM_DROPFILES=0x0233;
protected override void WndProc(ref Message m)
{
    if(m.Msg==WM_DROPFILES)
    {
        int iNumChars=DragQueryFile(m.WParam , 0, null, 0);
        StringBuilder szDropFilePath = new StringBuilder(iNumChars+1);

        DragQueryFile(m.WParam , 0, szDropFilePath, iNumChars+1);
       
        DragFinish(m.WParam );
        this.Text=szDropFilePath.ToString();
    }
    base.WndProc (ref m);
}

First, we add WS_EX_ACCEPTFILES window extended style to our form, this
will enable our form to accept shell file drop and display an accept icon
for dragging.

Whenever a file is dragged over our form, WM_DROPFILES will be posted to
the form WndProc. In this notificaiton, we can P/invoke DragQueryFile Shell
API to get the dropped files collection. Currently, I just pass 0 for the
second parameter to get the first file in the dropped file collection. For
more detailed usage of this API, please search it in MSDN documentation.

Hope this helps.
===================================================
Thank you for your patience and cooperation. If you have any questions or
concerns, please feel free to post it in the group. I am standing by to be
of assistance.

Best regards,
Jeffrey Tan
Microsoft Online Partner Support

test that, that should gives you some idea....

public partial class Form1 : Form
{
   public Form1()
   {
       AllowDrop = true;
   }
   protected override void OnDragEnter(DragEventArgs drgevent)
   {
       base.OnDragEnter(drgevent);
       string[] fmt = drgevent.Data.GetFormats();
       foreach (string s in fmt)
           Console.WriteLine(s);
       Console.WriteLine(drgevent.Data.GetData(DataFormats.FileDrop));
   }
}

And remember, use the force, Oops, I mean the debugger is your friend!

Thanks Jefferey and Lloyd for the quick responses to myt first post in this
forum.
I will check ithis and post back presently.