Null Reference Exception COM Objects
C#
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I'm getting a Null Reference Exception when using a COM object. The error occurs randomly, or so it seems, with nothing obvious to distinguish the runs when the error occurs and when it does not. As it so happens, the COM object connects to a particular software called Think & DO. When the other software runs on the PC, the COM object works perfectly, but when the other software runs on a Programmable Logic Controller (PLC)-and C# connects via the COM object directly to the PLC, the object is unreliable. Without knowing the details of the COM object, is there any advice someone can give me regarding how to discover the error I'm getting?