is there an event proceding the DragDrop Event

Question

hello , sadly im a noob  , and i cant manage to find an event that would accure after i droped a file in a richtextbox

*when u drop a file into a Rtb the icon's image is copied on to the control if u i downloaded a userr control wich derives from richtextbox , this control as a few method in wich it manipulates RTF among does are  AppendRtf(_rtf) 

now i want to present u with a secnario wich works 

1) i drag a file into the Rtb, i check if its a file deing draged onto the control if true i render all effects

void txt_send_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)

        {

            txt_send.Clear();

            if (e.Data.GetDataPresent(DataFormats.FileDrop, false) == true)

            {

                e.Effect = DragDropEffects.All;

            } 

           

        }

2) i drop the file ,here for this secnario all i do is update a boolean value that indicates the file as been droped

 void txt_send_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)

        {

            File_droped = true;           

        }

*after this event (2) an image is inserted into the Rtb 

3)  FINALLY  in order to test the issue i presented above , i call the mouseUp event , wich there i copy that image's RTF(Rich Text Format)

*so now ill click the control , and the following event is dispatched

*I JUST WANT TO CLARIFY THAT IM AWARE THE MOUSEUP DOSE NOT ACCURE AFTER THE DRAGDROP EVENT ,I ONLY ADD IT TO TEST THE ACCTUALL OPERATION I WANT TO PREFORM AND SEE THAT IT WORKS,

        void txt_send_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)

        {

            if (File_droped)

            {

                txt_main.AppendRtf(txt_send.Rtf); 

            } 

        }

*now the file's icon (Image) is copied to anouther RichTextBox (THIS WORKS)

now again what im looking for is an acctuall event that accures after the DragDrop Event , becuase i want this to preform after DragDrop as ended

if i attempt to do this from inside the event ,it wont work becuase the image only appears after the event 

 txt_main.AppendRtf(txt_send.Rtf);