.NET Tips and Tricks [General]

string fileName;
byte[] data = GenerateReport(string ReportTitle, out string fileName);

// The GenerateReport(..) method returns a byte array containing report content.
// The method will also initialise the string variable "fileName"

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Avoid indentations as much as possible because it makes your code harder to read.
Suggestion:
Instead of using if (A && B) { ... }
consider using if (!A || !B) continue;