[Mono-bugs] [Bug 77665][Nor] New - NRE when setting ComboBox.SelectedItem = -1

[bugzilla-daemon at bugzilla.ximian.com]

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Changed by sebastien at ximian.com.

http://bugzilla.ximian.com/show_bug.cgi?id=77665

--- shadow/77665	2006-02-28 11:44:17.000000000 -0500
+++ shadow/77665.tmp.9014	2006-02-28 11:44:17.000000000 -0500
@@ -0,0 +1,75 @@
+Bug#: 77665
+Product: Mono: Class Libraries
+Version: 1.1
+OS: 
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: Windows.Forms
+AssignedTo: peter at novonyx.com                            
+ReportedBy: sebastien at ximian.com               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: NRE when setting ComboBox.SelectedItem = -1
+
+Description of Problem:
+Setting ComboBox.SelectedItem to -1 results in a NRE.
+
+Steps to reproduce the problem:
+1. Use a ComboBox with it's DropDownStyle set to DropDownList
+2. By default the SelectedItem value is -1 (unselected)
+3. Change the combo box value (e.g. GUI)
+4. Reset the combo box to unselected (ComboBox.SelectedItem = -1)
+
+Actual Results:
+Unhandled Exception: System.NullReferenceException: Object reference not
+set to an instance of an object
+in <0x00077> swf_binary.Form1:shape1_Changed (System.Object sender,
+System.EventArgs e)
+in (wrapper delegate-invoke)
+System.MulticastDelegate:invoke_void_object_EventArgs (object,System.EventArgs)
+in <0x0002b> System.Windows.Forms.ComboBox:OnSelectedIndexChanged
+(System.EventArgs e)
+in <0x000aa> System.Windows.Forms.ComboBox:set_SelectedIndex (Int32 value)
+in <0x00017> swf_binary.Form1:resetButton_Click (System.Object sender,
+System.EventArgs e)
+in (wrapper delegate-invoke)
+System.MulticastDelegate:invoke_void_object_EventArgs (object,System.EventArgs)
+in <0x0001d> System.Windows.Forms.Control:OnClick (System.EventArgs e)
+in <0x000dd> System.Windows.Forms.Button:OnClick (System.EventArgs e)
+in <0x000f8> System.Windows.Forms.ButtonBase:OnMouseUp
+(System.Windows.Forms.MouseEventArgs mevent)
+in <0x0000d> System.Windows.Forms.Button:OnMouseUp
+(System.Windows.Forms.MouseEventArgs e)
+in <0x006a2> System.Windows.Forms.Control:WndProc
+(System.Windows.Forms.Message m)
+in <0x00060> System.Windows.Forms.ButtonBase:WndProc
+(System.Windows.Forms.Message m)
+in <0x0000d> System.Windows.Forms.Button:WndProc
+(System.Windows.Forms.Message m)
+in <0x00014> System.Windows.Forms.Control+ControlNativeWindow:WndProc
+(System.Windows.Forms.Message m)
+in <0x0011e> System.Windows.Forms.NativeWindow:WndProc (IntPtr hWnd, Msg
+msg, IntPtr wParam, IntPtr lParam)
+in <0x00016> System.Windows.Forms.XplatUIX11:DispatchMessage
+(System.Windows.Forms.MSG msg)
+in <0x00015> System.Windows.Forms.XplatUI:DispatchMessage
+(System.Windows.Forms.MSG msg)
+in <0x00605> System.Windows.Forms.Application:RunLoop (Boolean Modal,
+System.Windows.Forms.ApplicationContext context)
+in <0x00024> System.Windows.Forms.Application:Run
+(System.Windows.Forms.Form mainForm)
+in <0x0002c> swf_binary.Program:Main ()
+
+
+Expected Results:
+No exception. ComboBox returns to an unselected (empty) state.
+
+How often does this happen? 
+Always
+
+Additional Information: