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Create a Visual Studio C# project of type Custom Library, with Target Framework 4.6.2
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Add references to SpelCustomINF.dll and to ISPClientData3V2.dll from the application directory.
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Create new public class which implements "ISPELValidate" interface from "SpelCustomInf" namespace.
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Implement interface method "DoValidate" and property "LastErrorMessage" with your custom validation logic as shown in a code example.
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Build project to the application "bin" directory.