AccessViolationException

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   Hi,
I have an issue and just need ideas on where to look.   I have a report control that off of it the user adds information.   When completed, I have the control "refresh" itself with the following basic lines:

oControl:Records.DeleteAll();
while (oControl.Rows.Count > 0)
{
  oControl.RemoveRowEx(oControl.Rows[0]);
}
// Re-use original data loading into control
oControl.Populate();
This is the same routine used throughout; however, in this one location there is a persistent error:

System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData& msgData)
   at XtremeReportControl._DReportControl.RemoveRowEx(ReportRow Row)
   at AxXtremeReportControl.AxReportControl.RemoveRowEx(ReportRow row)
   at TrakkerLIB.reportItems.RemoveAllRows() in C:\Development\TrakkerSoftware\TrakkerLIB\Controls\reportItems.cs:line 91
   at TrakkerLIB.reportItems.RemoveAllItems() in C:\Development\TrakkerSoftware\TrakkerLIB\Controls\reportItems.cs:line 102
   at TrakkerControls.reportGridItems.RefreshAdminItemStages() in C:\Development\TrakkerSoftware\TrakkerControls\TrakkerControls\Grid Report Items\reportGridItems_ItemStages.cs:line 87
   at TrakkerLIB.reportItems.RefreshGrid() in C:\Development\TrakkerSoftware\TrakkerLIB\Controls\reportItems.cs:line 84
   at TrakkerControls.reportGridItems.addNewItemStage(Object sender, EventArgs e) in C:\Development\TrakkerSoftware\TrakkerControls\TrakkerControls\Grid Report Items\reportGridItems_ItemStages.cs:line 118
   at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ToolStrip.WndProc(Message& m)
   at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

So the question is, what should I be looking for as the potential cause?

Thanks,

Steve

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SteveStraley Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 25 November 2005 Status: Offline Points: 46	Post Options Post Reply Quote SteveStraley Report Post Thanks(0) Quote Reply Topic: AccessViolationException Posted: 05 January 2010 at 10:18am
	Hi, I have an issue and just need ideas on where to look. I have a report control that off of it the user adds information. When completed, I have the control "refresh" itself with the following basic lines: oControl:Records.DeleteAll(); while (oControl.Rows.Count > 0) { oControl.RemoveRowEx(oControl.Rows[0]); } // Re-use original data loading into control oControl.Populate(); This is the same routine used throughout; however, in this one location there is a persistent error: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData& msgData) at XtremeReportControl._DReportControl.RemoveRowEx(ReportRow Row) at AxXtremeReportControl.AxReportControl.RemoveRowEx(ReportRow row) at TrakkerLIB.reportItems.RemoveAllRows() in C:\Development\TrakkerSoftware\TrakkerLIB\Controls\reportItems.cs:line 91 at TrakkerLIB.reportItems.RemoveAllItems() in C:\Development\TrakkerSoftware\TrakkerLIB\Controls\reportItems.cs:line 102 at TrakkerControls.reportGridItems.RefreshAdminItemStages() in C:\Development\TrakkerSoftware\TrakkerControls\TrakkerControls\Grid Report Items\reportGridItems_ItemStages.cs:line 87 at TrakkerLIB.reportItems.RefreshGrid() in C:\Development\TrakkerSoftware\TrakkerLIB\Controls\reportItems.cs:line 84 at TrakkerControls.reportGridItems.addNewItemStage(Object sender, EventArgs e) in C:\Development\TrakkerSoftware\TrakkerControls\TrakkerControls\Grid Report Items\reportGridItems_ItemStages.cs:line 118 at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e) at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e) at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e) at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met) at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met) at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea) at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.ToolStrip.WndProc(Message& m) at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) So the question is, what should I be looking for as the potential cause? Thanks, Steve

mdoubson Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 17 November 2008 Status: Offline Points: 1705	Post Options Post Reply Quote mdoubson Report Post Thanks(0) Quote Reply Posted: 05 January 2010 at 11:20am
	You don't need to call oControl:Records.DeleteAll();

SteveStraley Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 25 November 2005 Status: Offline Points: 46	Post Options Post Reply Quote SteveStraley Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 11:14am
	Thanks... I'll give that a whirl...