I have code which creates a DataAdapter, and upddate command etc, and then
finally does and update which fails. The error message which is returned is
"Object Reference not set to an instance of an object."
The update SQL is "Update Leads set Company_Name = ? where LeadId = ?"
If I change it to: "Update Leads set Company_Name = ? where LeadID = 5" no
error is thrown and the record is updated.
The first thought of course is that there is a missing update parameter, but
looking in the debugger shows that there are two update parameters, and that
the second one looks just like it should, including having an appropriate
value.
Yet when the update occurs, the error is thrown. This is the the stack at
the time of the error:
An exception of type System.NullRefe renceException occured at 7/4/2005
7:59:13 PM
Message:Object reference not set to an instance of an object.
Method:Int32 Update(System.D ata.DataRow[],
System.Data.Com mon.DataTableMa pping)
at System.Data.Com mon.DbDataAdapt er.Update(DataR ow[] dataRows,
DataTableMappin g tableMapping)
at System.Data.Com mon.DbDataAdapt er.Update(DataS et dataSet, String
srcTable)
at Avasoft.Leads.L eadsListingSave (CDataSet oDataSet) in
c:\greg\clients \pwhite\blm non vss\blm00\dataa ccess\leads.cs: line 188
at Avasoft.LeadsLi stingBiz.LeadsL istingSave(CDat aSet oDataSet) in
c:\greg\clients \pwhite\blm non vss\blm00\busin ess\leadslistin gbiz.cs:line 27
at Avasoft.LeadVie wForm.button1_C lick(Object sender, EventArgs e) in
c:\greg\clients \pwhite\blm non vss\blm00\appma in\leadviewform .cs:line 305
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m, MouseButtons
button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at System.Windows. Forms.ControlNa tiveWindow.OnMe ssage(Message& m)
at System.Windows. Forms.ControlNa tiveWindow.WndP roc(Message& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Component Manager.System. Windows.Forms.U nsafeNativeMeth ods+IMsoCompone ntManager.FPush MessageLoop(Int 32
dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows. Forms.ThreadCon text.RunMessage LoopInner(Int32 reason,
ApplicationCont ext context)
at System.Windows. Forms.ThreadCon text.RunMessage Loop(Int32 reason,
ApplicationCont ext context)
at System.Windows. Forms.Applicati on.RunDialog(Fo rm form)
at System.Windows. Forms.Form.Show Dialog(IWin32Wi ndow owner)
at System.Windows. Forms.Form.Show Dialog()
at Avasoft.AppMain .RunApp() in C:\Greg\Clients \PWhite\BLM non
VSS\BLM00\AppMa in\AppMain.cs:l ine 84
at Avasoft.AppMain .DoApp() in C:\Greg\Clients \PWhite\BLM non
VSS\BLM00\AppMa in\AppMain.cs:l ine 47
Any insight into what is occuring would be greatly appreciated - I have
spent about 10 hours on this to no avail, done a Google search, looked
through help files, refactored etc. Thanks.
--
Greg Gum
1  1858 
This was resolved by re-installing the OleDB driver. Makes no sense, but
it's working now.
--
Greg Gum
"Greg" wrote: I have code which creates a DataAdapter, and upddate command etc, and then
finally does and update which fails. The error message which is returned is
"Object Reference not set to an instance of an object."
The update SQL is "Update Leads set Company_Name = ? where LeadId = ?"
If I change it to: "Update Leads set Company_Name = ? where LeadID = 5" no
error is thrown and the record is updated.
The first thought of course is that there is a missing update parameter, but
looking in the debugger shows that there are two update parameters, and that
the second one looks just like it should, including having an appropriate
value.
Yet when the update occurs, the error is thrown. This is the the stack at
the time of the error:
An exception of type System.NullRefe renceException occured at 7/4/2005
7:59:13 PM
Message:Object reference not set to an instance of an object.
Method:Int32 Update(System.D ata.DataRow[],
System.Data.Com mon.DataTableMa pping)
at System.Data.Com mon.DbDataAdapt er.Update(DataR ow[] dataRows,
DataTableMappin g tableMapping)
at System.Data.Com mon.DbDataAdapt er.Update(DataS et dataSet, String
srcTable)
at Avasoft.Leads.L eadsListingSave (CDataSet oDataSet) in
c:\greg\clients \pwhite\blm non vss\blm00\dataa ccess\leads.cs: line 188
at Avasoft.LeadsLi stingBiz.LeadsL istingSave(CDat aSet oDataSet) in
c:\greg\clients \pwhite\blm non vss\blm00\busin ess\leadslistin gbiz.cs:line 27
at Avasoft.LeadVie wForm.button1_C lick(Object sender, EventArgs e) in
c:\greg\clients \pwhite\blm non vss\blm00\appma in\leadviewform .cs:line 305
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m, MouseButtons
button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at System.Windows. Forms.ControlNa tiveWindow.OnMe ssage(Message& m)
at System.Windows. Forms.ControlNa tiveWindow.WndP roc(Message& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Component Manager.System. Windows.Forms.U nsafeNativeMeth ods+IMsoCompone ntManager.FPush MessageLoop(Int 32
dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows. Forms.ThreadCon text.RunMessage LoopInner(Int32 reason,
ApplicationCont ext context)
at System.Windows. Forms.ThreadCon text.RunMessage Loop(Int32 reason,
ApplicationCont ext context)
at System.Windows. Forms.Applicati on.RunDialog(Fo rm form)
at System.Windows. Forms.Form.Show Dialog(IWin32Wi ndow owner)
at System.Windows. Forms.Form.Show Dialog()
at Avasoft.AppMain .RunApp() in C:\Greg\Clients \PWhite\BLM non
VSS\BLM00\AppMa in\AppMain.cs:l ine 84
at Avasoft.AppMain .DoApp() in C:\Greg\Clients \PWhite\BLM non
VSS\BLM00\AppMa in\AppMain.cs:l ine 47
Any insight into what is occuring would be greatly appreciated - I have
spent about 10 hours on this to no avail, done a Google search, looked
through help files, refactored etc. Thanks.
--
Greg Gum This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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