Hi,

Thank you for your answer. I have changed the definition per your advise. When I run my project I get an exception. See below. It is the same exception all the time. Something with the follwoing:
System.Runtime.CompilerServices.Unsafe, Version=5.0.0.0
System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1

Note: I have different versions of Quick OPC on my server.




System.TypeInitializationException
HResult=0x80131534
Message=The type initializer for 'OpcLabs.EasyOpc.Forms.Browsing.OpcDialog' threw an exception.
Source=OpcLabs.EasyOpcForms
StackTrace:
at OpcLabs.EasyOpc.Forms.Browsing.OpcDialog..ctor()
at OpcLabs.EasyOpc.Forms.Browsing.OpcComputerAndServerDialog..ctor()
at EBO_Browse.OPC_Servers_Dialog..ctor() in D:\MyBin\Proj-VS2017\EBO-OPC Client\Configuration(4)\OPC_Servers_Dialog.vb:line 34

Inner Exception 1:
FileLoadException: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Inner Exception 2:
FileLoadException: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.1, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)


I appreciate your help.

Michael

Hi,

I have this variable definition:

Private OpcComputerAndServerDialog1 As OpcLabs.EasyOpc.Forms.Browsing.OpcComputerAndServerDialog

When I try browsing by this command:

If OpcComputerAndServerDialog1.ShowDialog() = DialogResult.OK Then

I get an exception:

OpcComputerAndServerDialog1 was Nothing.

System.NullReferenceException
HResult=0x80004003
Message=Object reference not set to an instance of an object.
Source=EBOOPCClientCFG
StackTrace:
at EBO_Browse.OPC_Servers_Dialog.ButtonBrowseServers_Click(Object sender, EventArgs e) in D:\MyBin\Proj-VS2017\EBO-OPC Client\Configuration(4)\OPC_Servers_Dialog.vb:line 400
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.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(IntPtr 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.RunDialog(Form form)
at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
at System.Windows.Forms.Form.ShowDialog()
at EBO_Browse.Form1.SettingsToolStripMenuItem1_Click(Object sender, EventArgs e) in D:\MyBin\Proj-VS2017\EBO-OPC Client\Configuration(4)\Form1.vb:line 1605
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.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(IntPtr 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 Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
at EBO_Browse.My.MyApplication.Main(String[] Args) in :line 81


Any idea what is wrong?

Thank you.

Michael