Me.lbl_studID.Text = DGV_studs.Item(1, i).Value.ToString()
You'll get that error if any of the following are Nothing;
For the line that is giving the error (it's slightly concerning that you don't think the line that throws the error is relevant information that you would include in the question) check each part to see what is Nothing and go from there. Either it is Nothing when it shouldn't be due to an error elsewhere, or Nothing is a valid scenario and you have to code to deal with it. We don't have access to your data so we can't do any of that for you, and we don't know what your required logic is so can't tell you what the fix is.