How I verify at-least one is checked in checkedlistbox in VB Codebhine Asp.net

Question

How I verify at-least one is checked in checkedlistbox in VB Codebhine Asp.net

Aypn CNN 446

Hi,

How I check at-least one is checkbox is checked in CheckBoxList control, I want to verify this in VB Code-Behind after clicking Button (Asp.net)

<asp:CheckBoxList ID="CBL_DD" runat="server" RepeatDirection="Horizontal">
<asp:ListItem Text="D1" Value="1" />
<asp:ListItem Text="D2" Value="2" />
<asp:ListItem Text="D3" Value="3" />
<asp:ListItem Text="D4" Value="4" />
<asp:ListItem Text="D5" Value="5" />
</asp:CheckBoxList>

<asp:Button ID="Btn_Verify_ChkBoxList" runat="server"  Text="VerifyChkList" Width="60px" />

Thanks in advance.

Aypn CNN 446

Hi,
I tried this, but I expect your response simply.

Protected Sub ValiCblist()

For Each Li As ListItem In CBL_DD.Items
If (Li.Selected) Then
If Li.Value <> "0" Then
CboxVal = CboxVal + 1
Else
CboxVal = 0
End If
lblMessage.Text = CboxVal
End If
Next

End sub

Aypn CNN 446

Hi,

Pls ref my code, I almost completed it.

 Protected Sub Validate_ChboxList()
        Dim count As Integer = 0
        For i As Integer = 0 To CBL_DD.Items.Count - 1
            If CBL_DD.Items(i).Selected = True Then
                count += 1
            End If
        Next
        lblMessage.Text = count.ToString()
    End Sub

1 answer

Your answer

Aypn CNN 446 Reputation points

2021-06-06T02:50:01.747+00:00

Hi,
I tried this, but I expect your response simply.

Protected Sub ValiCblist() For Each Li As ListItem In CBL_DD.Items If (Li.Selected) Then If Li.Value <> "0" Then CboxVal = CboxVal + 1 Else CboxVal = 0 End If lblMessage.Text = CboxVal End If Next End sub
Aypn CNN 446 Reputation points

2021-06-06T08:42:05.037+00:00

Hi,

Pls ref my code, I almost completed it.

Protected Sub Validate_ChboxList() Dim count As Integer = 0 For i As Integer = 0 To CBL_DD.Items.Count - 1 If CBL_DD.Items(i).Selected = True Then count += 1 End If Next lblMessage.Text = count.ToString() End Sub

Answer 1

Hi @Aypn CNN ,
If you want to check if there is at-least one checked, you could check if SelectedIndex is equal with -1. And if you want to know how many listboxes are checked,you could use count.
Just like this:

For i As Integer = 0 To CBL_DD.Items.Count - 1  
    Dim b As Boolean = (If((CBL_DD.SelectedIndex <> -1), True, False))  
    lblMessage.Text = b.ToString()  
Next

Best regards,
Yijing Sun

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How I verify at-least one is checked in checkedlistbox in VB Codebhine Asp.net

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