Tech Junkie Blog - Real World Tutorials, Happy Coding!: ASP.NET RadioButtonList : Bind RadioButtonList To A List Of Objects

Tuesday, July 22, 2014

ASP.NET RadioButtonList : Bind RadioButtonList To A List Of Objects

The RadioButtonList displays a collection of radio buttons on a web page. There can only be one selection in a group of choices at a time. In this tutorial we will create a RadioButtonList and then bind it to the Categories table of the Northwind database using a DataTable.

To create a RadioButtonList control do the following:

1.  Select the "RadioButtonList" control under the "Standard" control in the "Toolbox" pane on the left.

Drag RadioButtonList from the Toolbox
2.  Drag the RadioButtonList control to a design surface

RadioButtonList Choose Data Source

3.  In the source code of the .aspx page make sure "AutoPostBack" is set to true, the source code should look like this

<asp:RadioButtonList ID="RadioButtonList1" runat="server" 

4. Create a connection string in the Web.Config file
    <add name="NorthwindConnectionString" connectionString="Data Source=(local);
Initial Catalog=Northwind;Integrated Security=True" 
5. Create a new folder in your project call "BusinessObjects" then add a .cs file call "Category.cs"
Business objects RadioButtonList
6. In the "Category.cs" file type in the following code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace BusinessObjects
    public class Category
        private int _categoryID;
        private string _categoryName;

        public Category(int Id, string Name)
            this._categoryID = Id;
            this._categoryName = Name;

        public int CategoryID
            get { return this._categoryID; }
            set { this._categoryID = value; }

        public string CategoryName
            get { return this._categoryName; }
            set { this._categoryName = value; }


7.  In the code behind page(.cs) page of the .aspx page, type in the following lines at the top to use the following libraries
using System.Web.Configuration;
using System.Data.SqlClient;
using System.Data;
using BusinessObjects;
8. Create a new method call BindCategoriesRadioButtonListObjects() that returns void

        protected void BindCategoriesRadioButtonListObjects()
            DataTable dtCategories = new DataTable();
            string connectString = WebConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;
            List categories = new List();

            using (SqlConnection conn = new SqlConnection(connectString))
                SqlCommand cmd = new SqlCommand("SELECT CategoryID,CategoryName FROM Categories", conn);
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);

                foreach (DataRow row in dtCategories.Rows)
                    categories.Add(new Category(Convert.ToInt32(row["CategoryID"].ToString()), row["CategoryName"].ToString()));

                //used to set the RadioButtonList1.DataSource to categories list of objects
                RadioButtonList1.DataSource = categories;

                RadioButtonList1.DataTextField = "CategoryName";

                RadioButtonList1.DataValueField = "CategoryID";



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