将焦点放在数组中的文本框上

Question

I'm trying to validate my inputs. Each text box input is put into an array strExamAnswer(). As my user inputs A, B, C, or DI need to validate they are entering acceptable inputs. I have the validation correct but I want the incorrect text box to gain focus after validation catches the incorrect input. How can I get the focus on the said text box using a loop that is checking each input in the array?

Private Sub Validatation(ByVal intIndex As Integer)
    Dim strA As String = "A"
    Dim strB As String = "B"
    Dim strC As String = "C"
    Dim strD As String = "D"


    For i = 0 To 19
        If strExamAnswer(i) = strA Then
            blnOk = True
        ElseIf strExamAnswer(i) = strB Then
            blnOk = True
        ElseIf strExamAnswer(i) = strC Then
            blnOk = True
        ElseIf strExamAnswer(i) = strD Then
            blnOk = True
        Else
            MessageBox.Show("Please enter A, B, C, D for Answer " & strQuestion(i))
            blnOk = False
            Exit Sub
        End If
    Next

    blnOk = True

End Sub

So when this code kicks one of the questions back how do I tell it to focus on that specific text box in the array it is kicking out as invalid? Is there even a way to do this in a loop using an array. I would rather keep in a loop to limit amount of code. I could set up in a Case I just rather not.

Answer 1

假设该数组名为txtInput，并且具有与strExamAnswer相同的尺寸。

txtInput(i).Focus()