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Subject:
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Unhandled NullReference Exception
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Posted By:
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MAKO
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Post Date:
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4/17/2006 4:44:28 PM
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Hello my People!!
I'm kinda having a hard time with an unhandled exception I don't seem to find. Check the block of code from where I get it:
private void idProductoComboBox_SelectedValueChanged(object sender, EventArgs e)
{
this.idProductoTextBox.Text = this.idProductoComboBox.SelectedValue.ToString();
}
and this is the detail of the error message:
System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="RegistroRemisiones"
StackTrace:
at RegistroRemisiones.Remisiones.idProductoComboBox_SelectedValueChanged(Object sender, EventArgs e) in C:\Mis documentos\Visual Studio 2005\Projects\RegistroRemisiones\RegistroRemisiones\Remisiones.cs:line 50
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.ListControl.OnSelectedValueChanged(EventArgs e)
at System.Windows.Forms.ComboBox.OnSelectedValueChanged(EventArgs e)
at System.Windows.Forms.ComboBox.OnSelectedIndexChanged(EventArgs e)
at System.Windows.Forms.ComboBox.set_SelectedIndex(Int32 value)
at System.Windows.Forms.ComboBox.OnDataSourceChanged(EventArgs e)
at System.Windows.Forms.ListControl.SetDataConnection(Object newDataSource, BindingMemberInfo newDisplayMember, Boolean force)
at System.Windows.Forms.ListControl.DataSourceDisposed(Object sender, EventArgs e)
at System.ComponentModel.Component.Dispose(Boolean disposing)
at System.Windows.Forms.BindingSource.Dispose(Boolean disposing)
at System.ComponentModel.Component.Dispose()
at System.ComponentModel.Container.Dispose(Boolean disposing)
at System.ComponentModel.Container.Dispose()
at RegistroRemisiones.Remisiones.Dispose(Boolean disposing) in C:\Mis documentos\Visual Studio 2005\Projects\RegistroRemisiones\RegistroRemisiones\Remisiones.Designer.cs:line 18
at System.ComponentModel.Component.Dispose()
at System.Windows.Forms.Form.WmClose(Message& m)
at System.Windows.Forms.Form.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.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
at System.Windows.Forms.Form.DefWndProc(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmSysCommand(Message& m)
at System.Windows.Forms.Form.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.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
at System.Windows.Forms.Form.DefWndProc(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmNcButtonDown(Message& m)
at System.Windows.Forms.Form.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.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at RegistroRemisiones.Program.Main() in C:\Mis documentos\Visual Studio 2005\Projects\RegistroRemisiones\RegistroRemisiones\Program.cs:line 17
at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
at System.Runtime.Hosting.ManifestRunner.Run(Boolean checkAptModel)
at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData)
at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
this is stopping me from finishing a small test application I'm trying to develope. Help please!
MAKO - "El super simio"
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Reply By:
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rumbafum
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Reply Date:
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4/19/2006 5:46:25 AM
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Dont know what is the problem exactly but maybe your combo SelectedValue is null?
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