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How to insert multiple Checkboxlist value into database in asp.net

 In this post I will explain how we can insert the multiple selected value of Checkbox list into your database.
And retrieve the values from database to bind to check box list,
In previous article, I have explained the Difference between WCF and Web API and WCF REST and Web Service and when to use Web API over others services. In this article, you will learn when to use Web API with MVC.

Description:
I have created table name StudentQualifications , ID as  primary key in table refer below table structure .

ID
int
C_QUALIFICATION
varchar(50)

Now go to Visual Studio and take new website. After that add a webform to application. Drag and drop
Checkboxlist control from Toolbox. and take values like this

<asp:CheckBoxList ID="chkeducation" runat="server">
      <asp:ListItem>PGDCA</asp:ListItem>      
      <asp:ListItem>M.SC.</asp:ListItem>
        <asp:ListItem>MBA</asp:ListItem>
        <asp:ListItem>B.TECH</asp:ListItem>
        <asp:ListItem>MCA</asp:ListItem>
        <asp:ListItem>B.SC.</asp:ListItem>
        <asp:ListItem>POST GRADUATION</asp:ListItem>
        </asp:CheckBoxList>
        
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Insert" />

Now go to .aspx.cs page. Add namespace.

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connection"].ToString());
protected void Page_Load(object sender, EventArgs e)
    {
        if (con.State == ConnectionState.Closed)
        {
            con.Open();
        }
    }
protected void Button1_Click(object sender, EventArgs e)
    {
        String str = "";
        for (int i = 0; i <= chkeducation.Items.Count - 1; i++)
        {
            if (chkeducation.Items[i].Selected)
            {
                if (str == "")
                {
                    str = chkeducation.Items[i].Text;
                }
                else
                {
                    str += "," + chkeducation.Items[i].Text;
                }
            }
        }
        con.Open();
        SqlCommand cmd = new SqlCommand("Insert into QUALIFICATION(C_QUALIFICATION) values('" + str + "')", con);
        cmd.ExecuteNonQuery();
        Clear();
    }
    public void Clear()
    {
        chkeducation.SelectedIndex = -1;
    }

 In VB.net refer bellow code 

Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration
Dim con As New SqlConnection(ConfigurationManager.ConnectionStrings("connection").ToString())
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
       If con.State = ConnectionState.Closed Then
            con.Open()
        End If
    End Sub
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim str As [String] = ""
        For i As Integer = 0 To chkeducation.Items.Count - 1
            If chkeducation.Items(i).Selected Then
                If str = "" Then
                    str = chkeducation.Items(i).Text
                Else
                    str += "," + chkeducation.Items(i).Text
                End If
            End If
        Next
        Dim cmd As New SqlCommand("Insert into QUALIFICATION(C_QUALIFICATION) values('" & str & "')", con)
        cmd.ExecuteNonQuery()
        Clear()
        con.Close()
    End Sub
    Public Sub Clear()
        chkeducation.SelectedIndex = -1
    End Sub

Run the application you will get results ----happy coding

Retrieving values and assigning to check box list refer

http://www.4guysfromrolla.com/articles/050703-1.aspx

Note : Declare the connection string in web.config file 
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