When I call the webservice method from my form synchronously or assynchronously i am receiving the following error:
(System.NullReferenceException: Object reference not set to an instance)
I am being able to call the loadWindow webservice method without any problem but when i pass the dataset as parameter in the saveWindow im receiving the error above. Any solution will be appreciated.
//form
private void SaveData()
{
try
{
SYS_WS sysws = new SYS_WS();
sysws.SaveWindowCompleted +=new SaveWindowCompletedEventHandler(sysws_SaveWindowCompleted);
sysws.SaveWindowAsync((SYSDataset)dsSystem.GetChanges());
}
catch (Exception ex)
{
throw (ex);
}
}
private void sysws_SaveWindowCompleted(object sender,
SaveWindowCompletedEventArgs e)
{
try
{
if (e.Error != null)
{
return;
}
this.dsSystem.AcceptChanges();
}
catch (Exception ex)
{
throw ex;
}
}
//Webservices
[WebMethod(EnableSession = true)]
public bool SaveWindow(SYSDataset ds)
{
try
{
WindowController cont = new WindowController();
cont.SaveWindows(ds);
return true;
}
catch (Exception ex)
{
throw (ex);
}
}
[WebMethod(EnableSession = true)]
public SYSDataset LoadWindow(string WindowID)
{
WindowController cont = new WindowController();
return cont.LoadWindow(WindowID);
}
Sev MPosted Sep 1, 2009, 1:31 AM
the error line is before calling the webservice save method
sysws.SaveWindowCompleted +=new SaveWindowCompletedEventHandler(sysws_SaveWindowCompleted);
The Stack it might help you.
---- Stack Trace ----
RTR.SYS_V.Setup.frmWindow.SaveData()
frmWindow.cs: line 0091, col 17, IL 0079
RTR.SYS_V.Setup.frmWindow.btnSave_Click(sender As Object, e As EventArgs)
frmWindow.cs: line 0202, col 13, IL 0001
System.Windows.Forms.Control.OnClick(e As EventArgs)
MAIN.EXE: N 00111
System.Windows.Forms.Button.OnClick(e As EventArgs)
MAIN.EXE: N 00073
System.Windows.Forms.Button.OnMouseUp(mevent As MouseEventArgs)
MAIN.EXE: N 00171
System.Windows.Forms.Control.WmMouseUp(m As Message&, button As MouseButtons, clicks As Int32)
MAIN.EXE: N 00654
System.Windows.Forms.Control.WndProc(m As Message&)
MAIN.EXE: N 8788613
System.Windows.Forms.ButtonBase.WndProc(m As Message&)
MAIN.EXE: N 8807204
System.Windows.Forms.Button.WndProc(m As Message&)
MAIN.EXE: N 00031
System.Windows.Forms.ControlNativeWindow.OnMessage(m As Message&)
MAIN.EXE: N 00015
System.Windows.Forms.ControlNativeWindow.WndProc(m As Message&)
MAIN.EXE: N 00048
System.Windows.Forms.NativeWindow.Callback(hWnd As IntPtr, msg As Int32, wparam As IntPtr, lparam As IntPtr)
MAIN.EXE: N 00089
Roei BarPosted Aug 31, 2009, 11:27 AM