Here you made mistake.

change

If "Average grade: " >= 90 Then
letterGrade = "A"
ElseIf "Average grade: " >= 80 Then
letterGrade = "B"
ElseIf...

Somewhat correct. But you have to declare the variable at Form level not inside Click Event Handler


Dim bBtnClicked As Boolean = False
Private Sub cmdOne_Click(ByVal sender As...

Yes Now I Understand.This Query is working when Exactly the GraphicsCARD is NVIDIA*, because u specified = operator. When you query to the pattern (like NVIDIA*) you should use Like Operator. Also My...