title: How to transfer data from Excel to a DataGridView in C#?
body: <p>I've tried numerous methods I've seen online to copy a Excel file to a DataGridView, but none worked. My main problem is that with those methods there's a problem about fully understanding how they work without a proper explanation or they just give me strange errors, like one that told me that the Excel sheet I wanted to copy was a null instance of an object.
  I want to specify that I can easily work on the Excel file with other functions and I get no errors at all, I also don't need any kind of manipulation on the Excel file for this, just a plain way to copy it.
  Btw I started using C# just 2 days ago for a stage-thing for school, that's why I don't know much.</p>