Show Checkbox-List selected items as a String (separated by commas) in asp.net(C#,VB)

Now in this article I will show the selected items/values from the CheckBoxList in comma-separated string.In the design file(.aspx)  place a CheckBoxList and place two buttoncontrols and a label control as given below:

   <fieldset style="width:240px">

    <legend>Show Selected Items of CheckBoxList</legend>

     <asp:CheckBoxList ID="cblCourses" runat="server" RepeatColumns="3"

            RepeatDirection="Horizontal" Width="240px">

            <asp:ListItem>Asp.net</asp:ListItem>

            <asp:ListItem>C#</asp:ListItem>

            <asp:ListItem>VB</asp:ListItem>

            <asp:ListItem>WCF</asp:ListItem>

            <asp:ListItem>LINQ</asp:ListItem>

            <asp:ListItem>MVC</asp:ListItem>

        </asp:CheckBoxList>      

    </fieldset>

    <br />

        <asp:Button ID="BtnGetSelectedValues" runat="server" Text="Get Selected Values"

            onclick="BtnGetSelectedValues_Click" />

   

        <asp:Button ID="btnClearSelection" runat="server" Text="Clear Selection"

            onclick="btnClearSelection_Click" />

   

        <br />

             <br />

        <asp:Label ID="lblSelectedValues" runat="server" Text="" style="color: #FF3300"></asp:Label>

Now in the code behind file(.aspx.cs) write the code as:

Include the following namespace:

using System.Collections;

write the following code :

    protected void BtnGetSelectedValues_Click(object sender, EventArgs e)

    {

        if (cblCourses.SelectedIndex !=-1)

        {

            lblSelectedValues.Text = "Selected values are = " + GetCheckBoxListSelections();

        }

        else

        {

           lblSelectedValues.Text="Please select any course";

        }

    }

    private string GetCheckBoxListSelections()

    {

        string[] cblItems;       

        ArrayList cblSelections = new ArrayList();

        foreach (ListItem item in cblCourses.Items)

        {

            if (item.Selected)

            {

                cblSelections.Add(item.Text);

            }

        }

        cblItems = (string[])cblSelections.ToArray(typeof(string));

        return string.Join(",", cblItems);

    }

    protected void btnClearSelection_Click(object sender, EventArgs e)

    {

        cblCourses.ClearSelection();

        lblSelectedValues.Text = string.Empty;

    }

VB.Net Code  to Show CheckBoxList selected items as A string (comma separated format)

Source Code:

First Import following namespace:

imports System.Collections

and write the code as:

Protected Sub BtnGetSelectedValues_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlesBtnGetSelectedValues.Click

        If cblCourses.SelectedIndex <> -1 Then

            lblSelectedValues.Text = "Selected values are = " & GetCheckBoxListSelections()

        Else

            lblSelectedValues.Text = "Please select course"

        End If

    End Sub

    Private Function GetCheckBoxListSelections() As String

        Dim cblItems As String()

        Dim cblSelections As New ArrayList()

        For Each item As ListItem In cblCourses.Items

            If item.Selected Then

                cblSelections.Add(item.Text)

            End If

        Next

        cblItems = DirectCast(cblSelections.ToArray(GetType(String)), String())

        Return String.Join(",", cblItems)

    End Function

    Protected Sub btnClearSelection_Click(ByVal sender As Object, ByVal e As System.EventArgs) HandlesbtnClearSelection.Click

        cblCourses.ClearSelection()

        lblSelectedValues.Text = String.Empty

    End Sub