Everybody is good! I am now in combination with VBA VSTO development in c # can call c # method, but at the last step to encounter problems, I set. XLSM attribute ReferenceAssemblyFormVbaProject to true will pop up when the class can not be open to the VBA code, probably because the document does not contain VBA program, may also add to you do not have permission to access this document the VBA program,
Score is not much hope you can understand and help thank you!

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Text from the dialog box on the baidu search,