Private Sub ButScore_Click(ByVal sender As System.Object, ByVal e As System.Even

Question

Private Sub ButScore_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButScore.Click
Dim strGrades() As String = {"B", "D", "A", "A", "C", "A", "B", "A", "C", "D", "B", "C", "D", "A", "D", "C", "C", "B", "D", "A"}
Dim dtlResult(19) As Boolean
Dim incorrect As Integer = 0
Dim validInput As Integer = 0
Result.lstResult.Items.Clear()
Dim intCount As Integer = 0
Dim strInput(19) As String
strInput(0) = txt1.Text
strInput(1) = txt2.Text
strInput(2) = Txt3.Text
strInput(3) = txt4.Text
strInput(4) = txt5.Text
strInput(5) = txt6.Text
strInput(6) = txt7.Text
strInput(7) = txt8.Text
strInput(8) = txt9.Text
strInput(9) = txt10.Text
strInput(10) = txt11.Text
strInput(11) = txt12.Text
strInput(12) = txt13.Text
strInput(13) = txt14.Text
strInput(14) = txt15.Text
strInput(15) = txt15.Text
strInput(16) = txt17.Text
strInput(17) = txt18.Text
strInput(18) = txt19.Text
strInput(19) = txt20.Text
Try
For intCount = 0 To (strGrades.Length - 1)
If strInput(intCount).ToUpper() = "A" Or
strInput(intCount).ToUpper() = "B" Or
strInput(intCount).ToUpper() = "C" Or
strInput(intCount).ToUpper() = "D" Then
If strGrades(intCount) = strInput(intCount).ToUpper() Then
incorrect += 1
dtlResult(intCount) = True

End If
validInput = validInput + 1
End If
Next intCount
Catch ex As Exception
End Try

If validInput = 20 Then
Dim frmResult As New Result
frmResult.lstResult.Items.Clear()
frmResult.lstResult.Items.Add("..................")
frmResult.lstResult.Items.Add("Driver's License Exam Results")
frmResult.lstResult.Items.Add("..........")
For inCount = 0 To (20)
If (dtlResult(intCount) = True) Then
frmResult.lstResult.Items.Add(inCount + 1 & "Correct" & " Answer: " & strGrades(intCount))
Else
frmResult.lstResult.Items.Add(inCount + 1 & "Wrong" & " Answer: " & strGrades(intCount))
End If
Next inCount

frmResult.lstResult.Items.Add("....")
frmResult.lstResult.Items.Add(" Total :" & incorrect & " /20")
If (incorrect >= 15) Then
frmResult.lstResult.Items.Add("The Result is:" & " PASS")

Else
frmResult.lstResult.Items.Add("The Result is:" & " FAIL")
End If
frmResult.ShowDialog()
Else
MessageBox.Show("Input must be A, B, C, D", "Input Validation")

End If

Explanation / Answer

This is what I think.. Firstly dtlResult doesnt have a default initialization. You are only initializing this in a Try statement dtlResult(intCount) = True and trying to access it later on. That try block might not be getting executed and hence your dtlResult(intCount) might have some garbage value in it.

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