c# - Remove icon automatically by dropped file on RichTextBox -

i set true allowdrop implemented dragover , dragdrop events richtextbox. on dragdrop event load dropped text files' contents on rtb add icon of file in rtb i'd remove it:

edit: here's code:

void msg_setup_dragdrop()         {             msg_textbox.allowdrop = true; 

msg_textbox.enableautodragdrop = true; msg_textbox.dragenter += new drageventhandler(msg_dragenter); msg_textbox.dragdrop += new drageventhandler(msg_dragdrop); }

        void msg_dragenter(object sender, drageventargs e)         {             if (e.data.getdatapresent(dataformats.filedrop))                 e.effect = dragdropeffects.copy;         }          void msg_dragdrop(object sender, drageventargs e)         {             string[] files = (string[]) e.data.getdata(dataformats.filedrop);             stringbuilder buffer = new stringbuilder();              foreach (string filename in files)             {                 try                 {                     string text = file.readalltext(filename);                     buffer.append(text);                 }                 catch (exception ex)                 {                     string errmsg = string.format("cannot read file\"{0}\" error: {1}", filename, ex.message);                     messagebox.show(errmsg, "reading file error", messageboxbuttons.ok, messageboxicon.error);                     return;                 }             }              msg_textbox.text = buffer.tostring();         } 

somewhere have set msg_textbox.enableautodragdrop = true, either in designer window or code. need set false. still need set allowdrop = true.

when set true, winforms richtextbox provides standard behaviors drag-and-drop events, custom handlers added. if don't want standard behavior, have roll own handlers. (the standard behavior dropped text file ole embedding. if double click on icon, notepad launches.)