Hans, just a hint: This error mainly comes when any object in that line is not defined or is having a null/nothing value. Do you execute any SQL statements where one of the fields is not initialized correctly? Or do you try to fill a null vaule into the treeview? This may cause the error.
Regards, Klaus -- View this message in context: http://www.nabble.com/System.NullReferenceException%3A-Object-reference-not-set-to-an-instance-of-an-object---at-System.Windows.Forms.TreeView.MouseMoveHandler-when-dragging-a-node-in-a-treeview-tp23582605p23583832.html Sent from the Mono - VB mailing list archive at Nabble.com. _______________________________________________ Mono-vb mailing list [email protected] http://lists.ximian.com/mailman/listinfo/mono-vb
