How to populate and validate Dropdowncheckboxlist custom control in asp.net | ASPMANTRA | Asp.Net,MVC,AngularJs,Jquery,Javascript,Sql Server AND WCF snippets and tutorial

How to populate and validate Dropdowncheckboxlist custom control in asp.net

In this article I am going to explain how to populate and validate the Dropdowncheckbox custom control in asp.net.

How to populate and validate Dropdowncheckboxlist custom control in asp.net


Description:
In previous article I have discuss about DLL of DROPDOWNCHCKBOXES. When you added the control to toolbox, you will saw 2 control dropdowncheckboxes and validate control named ExtendedRequiredfiledValidator.

How to populate and validate Dropdowncheckboxlist custom control in asp.net

Implementation:
I have created a table Tb_State and insert some dummy records.

Id
int
StateName
varchar(100)

Now add a webform to project. Drag and drop the dropdowncheckboxes and validator control from toolbox. When you place the control on webform you will saw register directive on webform:
<%@ Register Assembly="DropDownCheckBoxes" Namespace="Saplin.Controls" TagPrefix="asp" %>

If you want select all option, set  UseSelectAllNode option to true.

By default text is select, if want to change set as e.g. given below:
<Texts SelectBoxCaption="Select State" />

Here is the complete HTML markup of webform:

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Dropdown checkboxes Tutorial</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <fieldset style="width:35%;height:160px">
    <legend>Example of Dropdown checkbox</legend>
    <table>
    <tr><td>Select State :</td><td><asp:DropDownCheckBoxes ID="ddlcheckbox" runat="server"
            Width="180px" UseSelectAllNode="true" AutoPostBack="true">
        <Style SelectBoxWidth="200" DropDownBoxBoxWidth="160" DropDownBoxBoxHeight="100" />
        <Texts SelectBoxCaption="Select State" />        
        </asp:DropDownCheckBoxes></td><td><asp:ExtendedRequiredFieldValidator ID="ExtendedRequiredFieldValidator1" runat="server" ControlToValidate="ddlcheckbox" ErrorMessage="State Field is required" ForeColor="Red"></asp:ExtendedRequiredFieldValidator>
       </td></tr>
     <tr><td></td><td></td><td></td></tr>
      <tr><td></td><td> <asp:Button ID="Button1" runat="server" Text="Button" /></td><td></td></tr>
    </table>     
    </fieldset>
    </div>
    </form>
</body>
</html>


Import the namespaces
C# code
using System.Data;
using System.Data.SqlClient;
using System.Configuration;


VB.net Code
Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration

Populate dropdowncheckboxes
Create a method to bind the control and call it on page load.
C# code
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connection"].ToString());
    DataTable dt = new DataTable();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Bindstate();
        }
    }

    public void Bindstate()
    {
        SqlDataAdapter adp = new SqlDataAdapter("select * from Tb_State", con);
        adp.Fill(dt);
        if (dt.Rows.Count > 0)
        {
            ddlcheckbox.DataSource = dt;
            ddlcheckbox.DataTextField = "Statename";
            ddlcheckbox.DataValueField = "Id";
            ddlcheckbox.DataBind();
        }
    }


VB.net Code
Private con As New SqlConnection(ConfigurationManager.ConnectionStrings("connection").ToString())
    Private dt As New DataTable()
    Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
        If Not IsPostBack Then
            Bindstate()
        End If
    End Sub
    Public Sub Bindstate()
        Dim adp As New SqlDataAdapter("select * from Tb_State", con)
        adp.Fill(dt)
        If dt.Rows.Count > 0 Then
            ddlcheckbox.DataSource = dt
            ddlcheckbox.DataTextField = "Statename"
            ddlcheckbox.DataValueField = "Id"
            ddlcheckbox.DataBind()
        End If
    End Sub


Button click write the below given code:
C# code
protected void Button1_Click(object sender, EventArgs e)
    {
        try
        {
            string statenames = string.Empty;
            foreach (ListItem item in ddlcheckbox.Items)
            {
                if (item.Selected)
                {
                    statenames += item.Text + "\\n";
                }
            }
            Response.Write("<script type=\"text/javascript\">alert('" + statenames + "');</script>");
        }
        catch (Exception ex) { }
    }


VB.net Code
    Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
        Try
            Dim statenames As String = String.Empty
            For Each item As ListItem In ddlcheckbox.Items
                If item.Selected Then
                    statenames += item.Text + "\n"
                End If
            Next
            Response.Write((Convert.ToString("<script type=""text/javascript"">alert('") & statenames) + "');</script>")
        Catch ex As Exception
        End Try
    End Sub
  
Now build and run the application. 


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