ASP.NET

private void ddlStatus_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			if(ddlStatus.SelectedValue.ToString() == "Closed")
			{
				btnAdd.Attributes.Add("onClick","javascript:return(confirm('Are you sure you want to close the Activity?'));");
			}
		}

private void btnAdd_Click(object sender, System.EventArgs e)
{
	if(ds.Tables.Count > 0)
				{
					if(ds.Tables[0].Rows.Count > 0)
					{
						int id = Convert.ToInt32(ds.Tables[0].Rows[0].ItemArray[0]);
						UpdateTextField(id,1,txtDesc.Text.Trim().Replace("'","''"));
						UpdateTextField(id,2,txtIssues.Text.Trim().Replace("'","''"));
						UpdateTextField(id,3,txtBusTechAdv.Text.Trim().Replace("'","''"));
					}
				}
}

<dxt:ASPxTimer ID="timerClock" runat="server" Interval="1000" OnTick="timerClock_Tick" />

<asp:UpdatePanel runat="server">

<Triggers>

    <asp:AsyncPostBackTrigger ControlID="timerClock" />

</Triggers>

<ContentTemplate>

    <asp:Table runat="server" Width="120" BorderWidth="0" CellPadding="0" CellSpacing="0">

    <asp:TableRow>

        <asp:TableCell HorizontalAlign="Center" VerticalAlign="Middle"><dxe:ASPxImage ID="imageFlag" runat="server" ImageUrl="~/images/flags/ar-BH.gif" /></asp:TableCell>

        <asp:TableCell HorizontalAlign="Center" VerticalAlign="Middle" Width="100%"><dxe:ASPxLabel ID="lblCurrentTime" runat="server" Font-Bold="true" Text="Loading.." /></asp:TableCell>

    </asp:TableRow>

    </asp:Table>

</ContentTemplate>

</asp:UpdatePanel>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
using System.Data;
using System.Data.Sql;
using System.Configuration;

namespace Test.DataAccessLayer
{
    public class PersonDataAccess
    {
        
        SqlConnection Conn = new                             SqlConnection(ConfigurationManager.ConnectionStrings["HostelConnectionString"].ConnectionString);
 
        public void insert()
        {
            try
            {
                Conn.Open();
            }
            catch (Exception ex)
            {                
????????????????????????????????????????????????????????????????????????????
            }            
        }        
    }
}

using System;
using System.Web;
using System.Data;
using System.Data.Common;

/// <summary>
/// Supports Shopping Cart functionality
/// </summary>
public class CartAccess
{
    public CartAccess()
    {
        //
        // TODO: Add constructor logic here
        //
    }

    // returns the shopping cart ID for the current user
    private static string shoppingCartId
    {
        get
        {
            HttpContext context = HttpContext.Current;
            string cartId;
            {
                // check if the cart ID exists as a cookie
                if (context.Request.Cookies["Delta_CartID"] != null)
                {
                    // return the id
                    //return context.Request.Cookies["Delta_CartID"].Value;
                    cartId = context.Request.Cookies["Delta_CartID"].Value;
                    return cartId;


                }
                else
                // if the cart ID doesn't exist in the cookie as well, generate a new ID
                {
                    // generate a new GUID
                    //Guid tempGuid = Guid.NewGuid();
                    //context.Response.Cookies["Delta_CartID"].Value = tempGuid.ToString();
                    cartId = Guid.NewGuid().ToString();
                    // create the cookie object and set its value
                    HttpCookie cookie = new HttpCookie("Delta_CartID", cartId);
                    // set the cookie's expiration
                    int howManyDays = deltaconfig.CartExpireDays;
                    DateTime currentDate = DateTime.Now;
                    TimeSpan timeSpan = new TimeSpan(howManyDays, 0, 0, 0);
                    DateTime expirationDate = currentDate.Add(timeSpan);
                    cookie.Expires = expirationDate;
                    // set the cookie on the client's browser
                    context.Response.Cookies.Add(cookie);
                    // return the CartID
                    return cartId.ToString();
                }
            }
        }
    }

    // Add a new shopping cart item
    public static bool AddItem(string bookId)
    {
        // get a configured DbCommand object
        DbCommand comm = DataAccess.CreateCommand();
        // set the stored procedure name
        comm.CommandText = "AddItem";
        // create a new parameter
        DbParameter param = comm.CreateParameter();
        param.ParameterName = "@CartID";
        param.Value = shoppingCartId;
        param.DbType = DbType.String;
        param.Size = 36;
        comm.Parameters.Add(param);
        // create a new parameter
        param = comm.CreateParameter();
        param.ParameterName = "@BookID";
        param.Value = bookId;
        param.DbType = DbType.Int32;
        comm.Parameters.Add(param);
        // returns true in case of success or false in case of an error
        try
        {
            // execute the stored procedure and return true if it executes
            // successfully, or false otherwise
            return (DataAccess.ExecuteNonQuery(comm) != -1);
        }
        catch
        {
            // prevent the exception from propagating, but return false to
            // signal the error
            return false;
        }
    }

    // Update the quantity of a shopping cart item
    public static bool UpdateItem(string bookId, int cquantity)
    {
        // get a configured DbCommand object
        DbCommand comm = DataAccess.CreateCommand();
        // set the stored procedure name
        comm.CommandText = "UpdateItem";
        // create a new parameter
        DbParameter param = comm.CreateParameter();
        param.ParameterName = "@CartID";
        param.Value = shoppingCartId;
        param.DbType = DbType.String;
        param.Size = 36;
        comm.Parameters.Add(param);
        // create a new parameter
        param = comm.CreateParameter();
        param.ParameterName = "@BookID";
        param.Value = bookId;
        param.DbType = DbType.Int32;
        comm.Parameters.Add(param);
        // create a new parameter
        param = comm.CreateParameter();
        param.ParameterName = "@CQuantity";
        param.Value = cquantity;
        param.DbType = DbType.Int32;
        comm.Parameters.Add(param);
        // returns true in case of success or false in case of an error
        try
        {
            // execute the stored procedure and return true if it executes
            // successfully, or false otherwise
            return (DataAccess.ExecuteNonQuery(comm) != -1);
        }
        catch
        {
            // prevent the exception from propagating, but return false to
            // signal the error
            return false;
        }
    }

    // Remove a shopping cart item
    public static bool RemoveItem(string bookId)
    {
        // get a configured DbCommand object
        DbCommand comm = DataAccess.CreateCommand();
        // set the stored procedure name
        comm.CommandText = "RemoveItem";
        // create a new parameter
        DbParameter param = comm.CreateParameter();
        param.ParameterName = "@CartID";
        param.Value = shoppingCartId;
        param.DbType = DbType.String;
        param.Size = 36;
        comm.Parameters.Add(param);
        // create a new parameter
        param = comm.CreateParameter();
        param.ParameterName = "@BookID";
        param.Value = bookId;
        param.DbType = DbType.Int32;
        comm.Parameters.Add(param);
        // returns true in case of success or false in case of an error
        try
        {

            // execute the stored procedure and return true if it executes
            // successfully, or false otherwise
            return (DataAccess.ExecuteNonQuery(comm) != -1);
        }
        catch
        {
            // prevent the exception from propagating, but return false to
            // signal the error
            return false;
        }
    }

    // Retrieve shopping cart items
    public static DataTable GetItem()
    {
        // get a configured DbCommand object
        DbCommand comm = DataAccess.CreateCommand();
        // set the stored procedure name
        comm.CommandText = "GetItem";
        // create a new parameter
        DbParameter param = comm.CreateParameter();
        param.ParameterName = "@CartID";
        param.Value = shoppingCartId;
        param.DbType = DbType.String;
        param.Size = 36;
        comm.Parameters.Add(param);
        // return the result table
        DataTable table = DataAccess.ExecuteSelectCommand(comm);
        return table;
    }

    // Retrieve shopping cart items
    public static decimal GetTotalAmount()
    {
        // get a configured DbCommand object
        DbCommand comm = DataAccess.CreateCommand();
        // set the stored procedure name
        comm.CommandText = "GetTotalAmount";
        // create a new parameter
        DbParameter param = comm.CreateParameter();
        param.ParameterName = "@CartID";
        param.Value = shoppingCartId;
        param.DbType = DbType.String;
        param.Size = 36;
        comm.Parameters.Add(param);
        // return the result table
        return Decimal.Parse(DataAccess.ExecuteScalar(comm));
    }

    // Counts old shopping carts
    public static int CountOldCarts(byte days)
    {
        // get a configured DbCommand object
        DbCommand comm = DataAccess.CreateCommand();
        // set the stored procedure name
        comm.CommandText = "CountOldCarts";
        // create a new parameter
        DbParameter param = comm.CreateParameter();
        param.ParameterName = "@Days";
        param.Value = days;
        param.DbType = DbType.Byte;
        comm.Parameters.Add(param);

        // execute the procedure and return number of old shopping carts
        try
        {
            return Byte.Parse(DataAccess.ExecuteScalar(comm));
        }
        catch
        {
            return -1;
        }
    }

    // Deletes old shopping carts
    public static bool DeleteOldCarts(byte days)
    {
        // get a configured DbCommand object
        DbCommand comm = DataAccess.CreateCommand();
        // set the stored procedure name
        comm.CommandText = "DeleteOldCarts";
        // create a new parameter
        DbParameter param = comm.CreateParameter();
        param.ParameterName = "@Days";
        param.Value = days;
        param.DbType = DbType.Byte;
        comm.Parameters.Add(param);
        // execute the procedure and return true if no problem occurs
        try
        {
            DataAccess.ExecuteNonQuery(comm);
            return true;
        }
        catch
        {
            return false;
        }
    }

}

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class ShoppingCart : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Populate();
        }
    }
    // fill shopping cart controls with data
    private void Populate()
    {
        // get the items in the shopping cart
        DataTable dt = CartAccess.GetItem();
        // if the shopping cart is empty...
        if (dt.Rows.Count == 0)
        {
            gridview.Visible = true;
            Updatebtn.Enabled = false;
            TotalAmount.Text = String.Format("{0:c}", 0);
        }
        else
        // if the shopping cart is not empty...
        {
            // populate the list with the shopping cart contents
            gridview.DataSource = dt;
            gridview.DataBind();
            gridview.Visible = true;
            Updatebtn.Enabled = true;
            // display the total amount
            decimal amount = CartAccess.GetTotalAmount();
            TotalAmount.Text = String.Format("{0:c}", amount);
        }
    }
    protected void continuebtn_Click(object sender, EventArgs e)
    {
        Response.Redirect("/");
    }
}

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class Product : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
            // Retrieve BookID from the query string
            string bookId = Request.QueryString["BookID"];
            // Retrieves product details
            BookDetails bd = CatalogAccess.GetBookDetails(bookId);
            // Does the product exist?
            if (bd.Name != null)
            {
                Populate(bd);
            }
            else
            {
                Server.Transfer("ProductNotfound.aspx");
            }
    }
    // Fill the control with data
    private void Populate(BookDetails bd)
    {
        
        // Display product details
        titleLabel.Text = bd.Name;
        descriptionLabel.Text = bd.Description;
        stockLabel.Text = Convert.ToString(bd.Quantity);
        priceLabel.Text = String.Format("{0:c}", bd.Price);
        authorLabel.Text = bd.Author;
        productImage.ImageUrl = "BookImage/" + bd.Image;
        // Set the title of the page
        this.Title = deltaconfig.SiteName + bd.Name;
    }
    protected void AddToCartButton_Click(object sender, EventArgs e)
    {
        // Retrieve ProductID from the query string
        string bookId = Request.QueryString["BookID"];

        CartAccess.AddItem(bookId);
    }
}