ArgumentException: String cannot be of zero length. (Parameter 'oldValue')

Question: I have this error, how do I solve it? ArgumentException: String cannot be of zero length. (Parameter 'oldValue')

 

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Answer: You are using the .ToString() without passing in the argument. There is a chance that you are trying to convert a #DateTime.Now to a string, remember the #DateTime is a a Struct that is more like a Class, in short it is an object containing Date related #variables, you cannot just turn that object into a plain all String.

In order to resolve this issue, add a paremeter inside the .ToString() like below:

string path = Url.Content(Path.Combine("wwwroot", "MyFolderOne", "MyFolder", $"MyReportName-{DateTime.Now.ToString("yyyyMMdd").Replace("/", "-")}.pdf"));

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