By the usage of relative path & datetime properties, you can make the file be saved dynamically by the combination of these methods:
→ currentDirectory = Environment.CurrentDirectory
→ relativePath = "Data\Output"
→ fileName = "yourFileName_"+Now.ToString("dd_MM_yyyy")+".yourFileExtension"
→ savingLocation = Path.Combine(currentDirectory, relativePath, fileName)
Hope this helps,
Best Regards.