Charith's Blog

Friday, May 23, 2008

How to get generated html of a page and change it.

public override void Render(System.Web.UI.HtmlTextWriter writer)
{
    StringBuilder sb = new StringBuilder();
    HtmlTextWriter htw = new HtmlTextWriter(new StringWriter(sb));
    base.Render(htw);
    string html = sb.ToString();
    ///
    /// Example
    /// 
    html.Replace("<b>", "<strong>");
    html.Replace("</b>", "</strong>");
    /// 
    /// Insert the meta tags
    /// Insert webtrends meta tags
    /// Move hidden system inserted fields
    /// Move viewstate
    /// Perform SEO checks
    /// And finally, write the HTML to original writer
    writer.Write(html);
}

Thursday, May 22, 2008

ASP.NET Master Pages and overriding attributes of Body tag

Default.Master page

<body id="MasterPageBody" runat="server" >
</body>

Code behind

public HtmlGenericControl Body
{
     get{ return this.MasterPageBody}
     set{ this.MasterPageBody = value;}
}

Content pageRegister

<%@ MasterPage VirtualPath="~/virtual/path/to/your/master/page" %>

Code Behind

public void Page_Load(object sender, EventArgs e)
{
     this.MasterPageBody.Attributes
            .Add("onload","javascript:alert('I am here')");
}

Tuesday, May 13, 2008

How to jQuery with Asp.net Ajax

Symptom:

<script language="javascript">
    $(document).ready(function () {
        ///
        ///execute only when a full page refresh.
        ///
    });
</script>

ready() function executes only when a page does a full page refresh not when it does a partial page refresh inside a update panel
Solution:

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
        <div class="rounded">
            Welcome to AJAX.Net
            <asp:Button ID="Button1" runat="server" Text="Button" CssClass="button" />
        </div>
        <script type="text/javascript" language="javascript">
            Sys.Application.add_load(functionNeedToBeExecuted);
            function functionNeedToBeExecuted() {
                // code need to be executed ....
            }
        </script>
    </ContentTemplate>
</asp:UpdatePanel>

Monday, April 21, 2008

ASP.NET page lifecycle (.NET 3.0)

ASP.NET page lifecycle (.NET 3.0) - for non post back request

Page Request
Start
Initialize
Load
Render
Unload

Reference: ASP.NET page lifecycle (MSDN)

public partial class Index : Page
    {
        protected override void Construct() { base.Construct(); }
        /// 
        /// Page Request
        /// 
        public override void ProcessRequest(HttpContext context) { base.ProcessRequest(context); }
        /// 
        /// Start
        /// 
        protected override void FrameworkInitialize() { base.FrameworkInitialize(); }
        protected override void InitializeCulture() { base.InitializeCulture(); }
        protected override ControlCollection CreateControlCollection() { return base.CreateControlCollection(); }
        protected override System.Collections.Specialized.NameValueCollection DeterminePostBackMode() { return base.DeterminePostBackMode(); }
        /// 
        /// Initialize
        /// 
        protected override void OnPreInit(EventArgs e) { base.OnPreInit(e); }
        protected override void OnInit(EventArgs e) { base.OnInit(e); }
        protected override void TrackViewState() { base.TrackViewState(); }
        protected override void OnInitComplete(EventArgs e) { base.OnInitComplete(e); }
        /// 
        /// Load
        /// 
        protected override void OnPreLoad(EventArgs e) { base.OnPreLoad(e); }
        protected override void OnLoad(EventArgs e) { base.OnLoad(e); }
        protected void Page_Load(object sender, EventArgs e) { }
        protected override void OnLoadComplete(EventArgs e) { base.OnLoadComplete(e); }
        protected override void EnsureChildControls() { base.EnsureChildControls(); }
        protected override void CreateChildControls() { base.CreateChildControls(); }
        /// 
        /// Render
        /// 
        protected override void OnPreRender(EventArgs e) { base.OnPreRender(e); }
        protected override void OnPreRenderComplete(EventArgs e) { base.OnPreRenderComplete(e); }
        protected override void OnSaveStateComplete(EventArgs e) { base.OnSaveStateComplete(e); }
        protected override HtmlTextWriter CreateHtmlTextWriter(System.IO.TextWriter tw) { return base.CreateHtmlTextWriter(tw); }
        public override void RenderControl(HtmlTextWriter writer) { base.RenderControl(writer); }
        protected override void Render(HtmlTextWriter writer) { base.Render(writer); }
        protected override void RenderChildren(HtmlTextWriter writer) { base.RenderChildren(writer); }
        /// 
        /// Unload
        /// 
        protected override void OnUnload(EventArgs e) { base.OnUnload(e); }
        public override void Dispose() { base.Dispose(); }
    }

Wednesday, April 16, 2008

Promotion

Promoted as a web developer from previous post of junior web developer

Sunday, March 23, 2008

ASP.NET Authentication

About

Securing location of an asp.net website with password protection while allowing anonymous users to the rest of the site.

The application can then call FormsAuthentication.Authenticate, supplying the username and password, and ASP.NET will verify the credentials. Credentials can be stored in cleartext, or as SHA1 or MD5 hashes, according to the following values of the passwordFormat attribute:

Hash Type Description
Clear Passwords are stored in cleartext
SHA1 Passwords are stored as SHA1 digests
MD5 Passwords are stored as MD5 digests

Usage

<authentication>
  <credentials;passwordformat="SHA1">
    <user name="Mary" password="GASDFSA9823598ASDBAD">
      <user name="John" password="ZASDFADSFASD23483142">
  </credentials>
</authentication>

if (FormsAuthentication.Authenticate(this.Login1.UserName, this.Login1.Password))
    FormsAuthentication.RedirectFromLoginPage(this.Login1.UserName, false);

Web.config

<configuration>
  <system.web>
    <compilation batch="false" debug="true" defaultlanguage="c#">
      <authentication mode="Forms">
        <forms name="cornerstone" 
               defaulturl="admin/admin.aspx" 
               timeout="20" 
               protection="All" 
               loginurl="admin/login.aspx" 
               path="/">
          <credentials passwordformat="Clear">
            <user name="user1" password="password1">
              <user name="user2" password="password2">
        </credentials>
        </forms>
      </authentication>
      <authorization>
        <allow users="*">
    </authorization>
    </system.web>
  <location path="admin">
    <system.web>
      <authorization>
        <deny users="?">
      </authorization>
    </system.web>
  </location>
  <configuration>

Thursday, November 29, 2007

Reading and writing to Windows.Registry.

using System.Configuration;
using System.Web.Security;
using System.ComponentModel;
using System.Diagnostics;
using System.Configuration.Install;
using Microsoft.Win32;
 
namespace Install.NameSpace
{
    [RunInstaller(true)]
    public class InstallHelper : Installer
    {
 
    #region Public Static Methods
 
    public static void SaveLocalRoot(String value)
    {
        try
        {
            RegistryKey key = Registry
                .LocalMachine.OpenSubKey(ConfigurationManager
                .AppSettings["LocalRootRegKey"]
                .ToString(), true);
            if (key == null)
            Registry.LocalMachine.CreateSubKey(ConfigurationManager
                .AppSettings["LocalRootRegKey"].ToString());
            key.SetValue("DefaultLocalRoot", value);
        }
        catch (Exception e)
        {
            throw e;
        }
    }
 
    #endregion
 
    }
}

Monday, November 26, 2007

XML Serialization and Deserialization in .NET

/// <summary>
/// Serialize
/// </summary>
/// <param name="clientList">List of objects</param>
/// <returns>success/fail (bool)</returns>
private static bool SaveClientAttributes(List clientList)
{
    try
    {
        XmlSerializer serializer = new XmlSerializer(typeof(List));
        StreamWriter writer =
        new StreamWriter((Server.MapPath(string.Empty)) 
            + "\\ClientData.xml");
        List ClientList = new List();
        serializer.Serialize(writer, clientList);
        return true;
    }
    catch (Exception ex)
    {
        return false;
    }
 
}
/// <summary>
/// Deserialize
/// </summary>
/// <returns>List of objects</returns>
private static List LoadClientAttributes()
{
    List clientList = new List();
    try
    {
        XmlSerializer serializer = new XmlSerializer(typeof(List));
        FileStream fileStream =
        new FileStream((Server.MapPath(string.Empty))
            + "\\ClientData.xml", FileAccess.Read);
        clientList = (List)serializer.Deserialize(fileStream);
    }
    catch (Exception ex)
    {
        //Do nothing
    }
    return clientList;
}

Wednesday, November 14, 2007

List.IndexOf(Object o) .NET 3.0

this.ddlCourier.SelectedIndex = affiliatecouriers.IndexOf(affiliatecouriers
        .Find(delegate(Courier courier)
        {
            return courier.ID ==
                int.Parse(iOrder.Supplementary.DeliveryCode);
        }));

References http://msdn2.microsoft.com/en-us/library/x0b5b5bc.aspx

Tuesday, November 13, 2007

Overriding Index of a Generic List

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
namespace Application.DomainModel.Collections
{
    public class Couriers<Courier> : List<Courier>
    {
        public Courier this[string courierCode]
        {
            get
            {
                return this.Find(delegate(Courier courier)
                { return (string.Compare(courier.CourierCode, courierCode) == 0); });
            }
        }
    }
    public class Courier
    {
        public string CourierCode { get; set; }
    }
}

Friday, November 09, 2007

ORA-24338: statement handle not executed

This happens when you try to read a cursor after fetching data from it. Try to read the cursor before you fetch data from it

PROCEDURE GetAffiliateCouriers(paffiliate_id number, io_cursor IN OUT appCursor)
IS
vcursor appCursor; tcursor appCursor; retCursor appCursor;
affiliate_id INTEGER; t_allow_courier_selection INTEGER;
v_row AFFILIATE%ROWTYPE; t_row AFFILIATE_COURIER%ROWTYPE;
BEGIN
vcursor := NULL;
tcursor := NULL;
affiliate_id := paffiliate_id;
LOOP
OPEN vcursor FOR SELECT * FROM affiliate WHERE id = affiliate_id AND allowcourierselection = 1;
FETCH vcursor INTO v_row;
IF (vcursor%FOUND) THEN
OPEN tcursor FOR SELECT * FROM affiliate_courier WHERE affiliate_courier.fk_affiliate_id = affiliate_id;
FETCH tcursor INTO t_row;
IF (tcursor%FOUND) THEN
OPEN retCursor FOR SELECT * FROM affiliate_courier WHERE affiliate_courier.fk_affiliate_id = affiliate_id;
io_cursor := retCursor;
RETURN;
END IF;
END IF;
SELECT fk_parent_id INTO affiliate_id FROM affiliate WHERE affiliate.id = affiliate_id;
EXIT WHEN affiliate_id IS NULL;
END LOOP;
io_cursor := retCursor;
END GetAffiliateCouriers;