The OPC Web Controls MessageBox component is great for operator entry confirmation before sending values to OPC Systems Tag Parameters.. The OPC Systems Properties are design mode accessible and allow for browsing any local or remote OPC Systems Service. For additional description of all properties and methods refer to the OPCWebControls Help file.
To add an OPC Web Controls MessageBox select the OPCWebControlsMessageBox component from the ToolBox and place it on any WebForm of your choice. See Add OPC Web Controls Components to Visual Studio.NET to add the OPC Web Controls MessageBox to the ToolBox.