learned/learning/to learn RSS 2.0
# Monday, 16 November 2009

 I was trying to add AJAX Control Toolkit to my Toolbox, for some reason Visual Studio was crashing. I found a solution for it, see this works out for you – start Visual Studio in safe mode (go to Visual Studio’s command prompt and execute ‘devenv /safemode’) and then try to add items to your toolbox, I was able to do it! There might be a better solution for this, please let me know if there is one.

Monday, 16 November 2009 15:04:38 (GMT Standard Time, UTC+00:00)  #    Comments [0] -
.NET | Solutions
# Saturday, 14 November 2009

Initially, I developed this deals alert service for my personal use and later on thought it might be useful for others too, so I extended it accordingly and added it here. This service basically grabs RSS feeds from deals sites (listed on the deals alert page of my site) and checks for the keyword(s) that are added, and if it finds a match, sends email at the time mentioned on the page. This service performs properly only if the keyword(s) are specific, because it is  just using some ‘exact’ and ‘like’ string searches. I might be improvising this by using dictionary or thesaurus in the future.  You can enter multiple keywords (separated by spaces) related to a single product, and only if all the words are present on the deal title, alert email will be sent. As I’m just using simple search here, the deal may not be related to the product you are looking. For eg., say suppose you add an alert for ‘card reader’ and if there is any deal for a laptop with ‘card reader’, my service is going to grab this deal too, because this service is not as intelligent as you are :). So, in this case it is better to add price limit too.

 

I have added this service without any commercial intention, so do not worry about your emailids, I won’t trade them to advertisers, and moreover you can unsubscribe from this service or modify the added keywords at any time by clicking ‘Unsubscribe’ link on the email that will be sent to you after adding an alert.

 

After writing this service I understood how difficult it is come up with search algorithms, hats off to Google and other search engines. Implementing ‘exact’ keyword search was easy whereas ‘like’ search was very difficult.  For eg., I added ‘backpack’ as keyword, the service was bringing all the deals having ‘pack’ on the title, like ‘cd pack’, ‘dvd pack’ etc. I told about this service to couple of my friends, and one of my friends added ‘mens watches’ as keyword, and found out that most of the deals had “men’s” on the title. I recoded to accommodate this scenario, but still it is going to bring deals related to women's watch even if you add men's watch. One last example, keyword ‘all in one printer’, there was a deal with title ‘Calls to any phone in India’, if you see here ‘all’ is in ‘calls’, ‘in’ is in ‘India’ and ‘one’ is in ‘phone’. I can keep listing out examples on this service's ability/disability. As a developer, I have done my testing part (developer's test cases are always subset of testers' test cases) to an extent, it is yours now...you are my testers!

 

If you have any idea or thoughts to improvise this service, please send your comments. Here is the link.

Saturday, 14 November 2009 15:01:34 (GMT Standard Time, UTC+00:00)  #    Comments [1] -
Miscellaneous
# Thursday, 12 November 2009

This program prevents your system from getting locked even if it is left idle for time greater than your screen saver time. It basically presses ‘down’ arrow key every minute.

 

Create a Windows Forms Application and add a timer to the form.

 

public Form1()

{

    InitializeComponent();

    StartAction();

}

 

private void StartAction()

{

    // the timer is started and the form is minimized

    // set the timer interval as per your needs. I have set it to be 60000 milliseconds = 1 min

    timer_keypress.Enabled = true;

    this.WindowState = FormWindowState.Minimized;

    this.ShowInTaskbar = false;

}

 

 

To add the application to your system tray when minimized, add a notify icon from your toolbox to the forms and set properties appropriately. I chose an icon and changed the text property. By default this form will be in minimized state, as I have added code to do so in my StartAction function.

 

Add context menu from your toolbox to show menu when the system tray icon is right clicked. Right click contextMenuStrip and choose Edit items to add your menu items. Double click on the menu item to add a handler. I’ve added ‘Exit’ menu. Set your notify icon’s contextmenustrip property.

 

private void exitToolStripMenuItem_Click(object sender, EventArgs e)

{

    StopAction();

}

 

private void StopAction()

{

    // the timer is stopped and the form is closed  

    timer_keypress.Enabled = false;

    this.Close();

}

 

// this event will be triggered every minute

private void timer_keypress_Tick(object sender, EventArgs e)

{

    SendKeys.SendWait("{DOWN}");

}

 

There are many ways to do this, I found this one to be easy.


Here is the fileKeyPress.exe (889 KB)
Thursday, 12 November 2009 22:52:51 (GMT Standard Time, UTC+00:00)  #    Comments [0] -
.NET
# Friday, 06 November 2009

With <authentication mode="Windows"/> in your application and Anonymous access enabled in IIS, you will see the following results:

 

System.Environment.UserName: Computer Name

Page.User.Identity.Name: Blank

System.Security.Principal.WindowsIdentity.GetCurrent().Name: Computer Name

 

With <authentication mode="Windows"/> in your application, and ‘Anonymous access’ disabled and only ‘Integrated Windows Authentication’ in IIS, you will see the following results:

 

System.Environment.UserName: ASPNET (user account used to run ASP.NET service)

Page.User.Identity.Name: Domain\ Windows Account Name

System.Security.Principal.WindowsIdentity.GetCurrent().Name: Computer Name\ASPNET

 

With <authentication mode="Windows"/> and <identity impersonate ="true"/> in your application, and ‘Anonymous access’ disabled and only ‘Integrated Windows Authentication’ in IIS, you will see the following results:

 

System.Environment.UserName: Windows Account Name

Page.User.Identity.Name: Domain\ Windows Account Name

System.Security.Principal.WindowsIdentity.GetCurrent().Name: Domain\ Windows Account Name


With <authentication mode="Forms"/>:

Request.ServerVariables["LOGON_USER"]: Domain\ Windows Account Name


Friday, 06 November 2009 15:04:37 (GMT Standard Time, UTC+00:00)  #    Comments [0] -
.NET
# Thursday, 05 November 2009
Thursday, 05 November 2009 04:57:42 (GMT Standard Time, UTC+00:00)  #    Comments [0] -
Softwares
# Friday, 23 October 2009

Solutions for postback problem:
1. Add "<base target = “_self” />" inside <head> tag of the popup.
2. You can use window.open instead of window.showModalDialog.

Solutions for session transfer problem:

1. You can use window.open instead of window.showModalDialog.

2. You can use AJAX modal popup.

 

This seems to be a IE bug (working fine in firefox and chrome), I have this problem if I open the .NET application after opening an instance of IE (say google.com) whereas if I open the former before the latter, things are fine.


Please let me know if anybody has any good solution for this.

Friday, 23 October 2009 12:07:04 (GMT Daylight Time, UTC+01:00)  #    Comments [0] -
.NET | Solutions
# Wednesday, 30 September 2009

This article describes how to notify users about session expiration and allow them to renew the session.

Controls that need to be added:
1. A Panel with an OK button.

2. A label with session expiration notification message.

3. An AJAX ModalPopupExtender.

4. A dummy button and set ModalPopupExtender’s TargetControlId as this button.

 

This is how it looks:

 

<cc1:ModalPopupExtender ID="modext_promptmessage" runat="server" BehaviorID="popup_promptmessage"

    PopupControlID="pnl_popup" TargetControlID="btn_dummy">

</cc1:ModalPopupExtender>

<asp:Panel ID="pnl_popup" runat="server" Style="display: none">

    <table cellpadding="0" cellspacing="0" border="0">

        <tr valign="top">

            <th>

                Prompt Message

            </th>

        </tr>

        <tr>

            <td>               

                        <label>Your session is going to expire in 2 minutes. Please click OK to renew it."></label>

<asp:Button ID="btn_ok" runat="server" OnClientClick="ResetSession()" Text="OK" />

            </td>

        </tr>

    </table>

</asp:Panel>

 

My code behind class looks like this:

 

   Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

     

      ' checks whether session expired

      If Current.Session.Keys.Count = 0 Then

                        Response.Redirect("sessionexpired.aspx", True)

            Exit Sub

      End If

 

' Javascript function PromptSessionExpiration() will be called 2 minutes before session expiration (120000 milliseconds)

      Dim strExpireSessionScript As String = String.Format("setTimeout('PromptSessionExpiration()', {0}); ", (Me.Session.Timeout * 60000) - 120000)

      Me.Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), "expirescript", strExpireSessionScript, True)

 

   End Sub

 

   ''' This click event will renew the session, need not add any code inside it

   Protected Sub btn_ok_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_ok.Click 

   End Sub

 

 

My javascript:

 

<script language="javascript" type="text/javascript">

 

    function PromptSessionExpiration() {

              // the function below will be triggered at the 125th second

        setTimeout('CheckSessionStatus()', 125000);

        // show popup

        $find('popup_promptmessage').show();

    }

 

    // handles closing popup

    function ResetSession() {

        $find('popup_promptmessage').hide();

    }

 

    // this function will be called if user doesn’t respond to the prompt message

    // which will redirect to sessionexpired page

    function CheckSessionStatus() {

            window.location = “sessionexpired.aspx”;

    }   

  

 </script>

 

Thanks.

Wednesday, 30 September 2009 19:55:52 (GMT Daylight Time, UTC+01:00)  #    Comments [0] -
.NET
# Tuesday, 15 September 2009

This article shows you how to use ASP.NET AJAX PageMethods to perform Create, Read, Update and Delete (CRUD) operations with an HTML table. Here HTML table acts as a light-weight DataGrid.

 

Inorder to make PageMethods work, following things need to be done:

  1. ScriptManager should be added to your ASPX page.
  2. EnablePageMethods property of the ScriptManager should be set to true.
  3. System.Web.Services namespace should be added as reference on your codebehind class.
  4. Page Methods on your code-behind should be decorated with [WebMethod] attribute.

 

First let us start with Read.


As mentioned above, add a ScriptManager and set its 'EnablePageMethods' property to true. Add an HTML button and an onclick handler to it, and then add an HTML table with thead, tbody and tfoot. Since the HTML table will be referenced from javascript, add id to the table and its body. Here, only HTML tags/controls are used because, server side controls cannot be referenced in PageMethods.


Your ASPX page should look something like this.

 

<body>

    <form id="form1" runat="server">   

        <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods ="true" ></asp:ScriptManager>

        <%--This click event handles loading data from the database--%>

        <input id="btn_load" type="button" value="Load" onclick = "LoadData()" />

        <br /><br />

    <div>

        <table style=" height: 100%; border: solid 1px #000" cellpadding="0" cellspacing="1" id="tbl_grid" border = "1">

            <thead style = "background-color: #666; color: #fff">

                <tr>

                    <td style="width: 100px;">

                        Column1

                    </td>

                    <td style="width: 500px;">

                        Column2

                    </td>

                    <td style="width: 150px;">

                        Edit

                    </td>

                </tr>

            </thead>

            <tbody id="tbody_grid">

            </tbody>

            <tfoot>

                <tr>

                    <td style="width: 100px;">

                        <input id="txt_addcol1" style ="width: 30px" type="text" />

                    </td>

                    <td style="width: 500px;">

                        <input id="txt_addcol2" type="text"  style ="width: 300px" />

                    </td>

                    <td style="width: 150px;">                   

                        <%--This click event handles adding data to the database--%>

                        <input id="btn_add" type="button" onclick = "Add()" value="Add" />

                    </td>

                </tr>

            </tfoot>

        </table>

    </div>

    </form>

</body>

 

Now add your JavaScript function to load data from the database using PageMethods. PageMethod call should always have a success handler (this will be executed if the page method is executed successfully) and an exception handler (this will be executed if an exception is thrown). Say suppose we added 'GetData()' as the page method on the code behind, our javascript will be PageMethods.GetData(SuccessHandler, ExceptionHandler). Just for understanding, I have named the success and exception handler appropriately, you can name them as you wish. In case, the page methods takes parameters, you can add like PageMethods.GetData(param1, param2, SuccessHandler, ExceptionHandler).

Page methods should be decorated with [WebMethod] attribute and should be declared as static. Its signature shoul look something like this:

[WebMethod]

public static string GetData()


Page method to return data to javascript.


public partial class AJAXGrid : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

 

    }


    [WebMethod]

    public static IEnumerable<MyEntity> GetData()

    {

        try

        {                  

Data fetch part should go here

            // used List, as collections are serializable. See below for MyEntity class

            List<MyEntity> MyEntities = new List<MyEntity>();

 

            MyEntities.Add("1", "abc");

MyEntities.Add("2", "xyz");

MyEntities.Add("3", "pqr");

MyEntities.Add("4", "mno");


return MyEntities; 

}

        catch(Exception ex)

        {

            throw ex;

        }

 

    }
}


MyEntity class

 

public class MyEntity

{

    private string _Column1;

 

    public string Column1

    {

      get { return _Column1; }

      set { _Column1 = value; }

    }

   

    private string _Column2;

 

    public string Column2

    {

      get { return _Column2; }

      set { _Column2 = value; }

    }

 

    public MyEntity(string sCol1, string sCol2)

    {

        _Column1 = sCol1;

        _Column2 = sCol2;

    }

}

 

Javascript function that calls page method and populates the HTML table
 

<script type ="text/javascript" language = "javascript ">

 

//Loading Data

 

    // Handles btn_load click event

    function LoadData() {

 

        // If data was fetched successfully, SuccessHandler will be called; else, ExceptionHandler

        PageMethods.GetData(SuccessHandler, ExceptionHandler);

 

  // Incase parameters need to be passed to PageMethods, you can do like this PageMethods.GetData(param1, param2, SuccessHandler, ExceptionHandler)

 

 

    }

 

    // After fetching the data successfully

    function SuccessHandler(result) {

 

        var tbody = $get("tbody_grid");

        // clear the table

        for (var j = tbody.rows.length; j > 0; j--) {

            tbody.deleteRow(j - 1);

        }

        // populate the table

        for (var i = 0; i < result.length; i++) {

            //two columns fetched from database are sent as parameters

            AddRow(result[i].Column1, result[i].Column2);        

        }

        return true;

    }

 

    // Edit and Delete buttons are added to the rows

    function AddRow(col1, col2) {

        var tbody = $get("tbody_grid");

        var row = document.createElement("tr")

        var td1 = document.createElement("td")

        td1.innerText = col1;

        var td2 = document.createElement("td");

        td2.innerText = col2;

        var td3 = document.createElement("td");

        // add buttons

        var btnEdit = document.createElement('input');

        btnEdit.setAttribute('type', 'button');

        btnEdit.setAttribute('name', 'Edit');

        btnEdit.setAttribute('value', 'Edit');

        // first parentNode represents <td> and the second represents <tr>

        btnEdit.onclick = function() { Edit(this.parentNode.parentNode); };

        var btnDelete = document.createElement('input');

        btnDelete.setAttribute('type', 'button');

        btnDelete.setAttribute('name', 'Delete');

        btnDelete.setAttribute('value', 'Delete');

        btnDelete.onclick = function() { DeleteRow(this.parentNode.parentNode); };

        td3.appendChild(btnEdit);

        td3.appendChild(btnDelete);

        row.appendChild(td1);

        row.appendChild(td2);

        row.appendChild(td3);

        tbody.appendChild(row);       

    }

 

    // Handles exception

    function ExceptionHandler(result) {

    }


After populating the HTML table 



Javascript functions to handle Edit, Update, Delete and Insert:


Editing Data

 

    //  this function handles edit button click

    function Edit(row) {

 

        var col1 = row.childNodes[0].innerText;

        var col2 = row.childNodes[1].innerText;

       

        // populates values in textboxes and displays Update and Cancel buttons

        var editableRow = document.createElement("tr")

        var td1 = document.createElement("td")

        var txtBox1 = document.createElement('input');

        txtBox1.setAttribute('type', 'text');

        txtBox1.setAttribute('name', 'col1');

        txtBox1.setAttribute('value', col1);

        txtBox1.setAttribute('width', 30);

        td1.appendChild(txtBox1);

        var td2 = document.createElement("td");

        var txtBox2 = document.createElement('input');

        txtBox2.setAttribute('width', 300);

        txtBox2.setAttribute('type', 'text');

        txtBox2.setAttribute('name', 'col1');

        txtBox2.setAttribute('value', col2);

        td2.appendChild(txtBox2);

        var td3 = document.createElement("td");

        var btnUpdate = document.createElement('input');

        btnUpdate.setAttribute('type', 'button');

        btnUpdate.setAttribute('name', 'Update');

        btnUpdate.setAttribute('value', 'Update');

        btnUpdate.onclick = function() { Update(this.parentNode.parentNode); };

        var btnCancel = document.createElement('input');

        btnCancel.setAttribute('type', 'button');

        btnCancel.setAttribute('name', 'Cancel');

        btnCancel.setAttribute('value', 'Cancel');

        btnCancel.onclick = function() { Cancel(this.parentNode.parentNode); };

        td3.appendChild(btnUpdate);

        td3.appendChild(btnCancel);

        editableRow.appendChild(td1);

        editableRow.appendChild(td2);

        editableRow.appendChild(td3);

        row.parentNode.replaceChild(editableRow, row);

    }


After edit button click



 

Updating Data

 

    //  this function handles update button click

    function Update(row) {

 

        // fetches values entered in the textboxes

        // first childNode represent <td> inside <tr> and second childNode represents textbox

        var col1 = row.childNodes[0].childNodes[0].value;

        var col2 = row.childNodes[1].childNodes[0].value;

 

        // values sent to server

        PageMethods.UpdateData(col1, col2, UpdateSuccess(row), ExceptionHandler);      

    }

 

    // After updating the values successfully

    function UpdateSuccess(row) {

 

        var col1 = row.childNodes[0].childNodes[0].value;

        var col2 = row.childNodes[1].childNodes[0].value;

 

        var editableRow = document.createElement("tr")

        var td1 = document.createElement("td")

        td1.innerText = col1;

        var td2 = document.createElement("td");

        td2.innerText = col2;

        var td3 = document.createElement("td");

        var btnEdit = document.createElement('input');

        btnEdit.setAttribute('type', 'button');

        btnEdit.setAttribute('name', 'Edit');

        btnEdit.setAttribute('value', 'Edit');

        btnEdit.onclick = function() { Edit(this.parentNode.parentNode); };

        var btnDelete = document.createElement('input');

        btnDelete.setAttribute('type', 'button');

        btnDelete.setAttribute('name', 'Delete');

        btnDelete.setAttribute('value', 'Delete');

        btnDelete.onclick = function() { DeleteRow(this.parentNode.parentNode); };

        td3.appendChild(btnEdit);

        td3.appendChild(btnDelete);

        editableRow.appendChild(td1);

        editableRow.appendChild(td2);

        editableRow.appendChild(td3);

        row.parentNode.replaceChild(editableRow, row);

 

    }

 

    // this function handles cancel button click

    function Cancel(row) {

 

        // values are again populated in labels instead of textboxes

        var col1 = row.childNodes[0].childNodes[0].value;

        var col2 = row.childNodes[1].childNodes[0].value;

 

        var editableRow = document.createElement("tr")

        var td1 = document.createElement("td")

        td1.innerText = col1;

        var td2 = document.createElement("td");

        td2.innerText = col2;

        var td3 = document.createElement("td");

        var btnEdit = document.createElement('input');

        btnEdit.setAttribute('type', 'button');

        btnEdit.setAttribute('name', 'Edit');

        btnEdit.setAttribute('value', 'Edit');

        btnEdit.onclick = function() { Edit(this.parentNode.parentNode); };

        var btnDelete = document.createElement('input');

        btnDelete.setAttribute('type', 'button');

        btnDelete.setAttribute('name', 'Delete');

        btnDelete.setAttribute('value', 'Delete');

        btnDelete.onclick = function() { DeleteRow(this.parentNode.parentNode); };

        td3.appendChild(btnEdit);

        td3.appendChild(btnDelete);

        editableRow.appendChild(td1);

        editableRow.appendChild(td2);

        editableRow.appendChild(td3);

        row.parentNode.replaceChild(editableRow, row);

    }

 

    //  this function handles 'add' button click

    function Add() {

 

        var col1 = $get("txt_addcol1").value;

        var col2 = $get("txt_addcol2").value;

 

        // data sent to the database

        PageMethods.InsertData(col1, col2, AddSuccess(col1, col2), ExceptionHandler);        

 

    }

 

    // After adding the data successfully

    function AddSuccess(col1, col2) {

 

        // add the values to the table

        AddRow(col1, col2);

       

        // clear the textboxes in the footer

        $get("txt_addcol1").value = "";

        $get("txt_addcol2").value = "";

       

    }

 

Deleting Data

 

    // this function handles delete button click

    function DeleteRow(row) {

 

        var col1 = row.childNodes[0].innerText;

        // delete from the database

        PageMethods.DeleteData(col1, DeleteSuccess(row), ExceptionHandler);

    }

 

    function DeleteSuccess(row) {

        // delete the row from the table

        var tbody = $get("tbody_grid");

        tbody.removeChild(row);

    }

   

 

</script>

 

Page methods to handle Edit, Update, Delete and Insert:

           

 

    [WebMethod]

    public static void UpdateData(string sCol1, string sCol2)

    {

  try

        {                  

        Data update part should go here     

        }

        catch(Exception ex)

        {

            throw ex;

        }

 

    }

 

    [WebMethod]

    public static void InsertData(string sCol1, string sCol2)

    {

        try

        {

                          Data insert part should go here        

        }

        catch(Exception ex)

        {

            throw ex;

        }

    }

 

    [WebMethod]

    public static void DeleteData(string sCol1)

    {

        try

        {

                           Data delete part should go here         

        }

        catch (Exception ex)

        {

            throw ex;

        }

    }

}


We can add paging and sorting too.


This code has been tested in IE7+, Firefox, Chrome and Safari.

 

Some of the limitations in using ASP.NET AJAX PageMethods:

1.       We can't access asp.net server controls (like TextBox control) in the WebMethod directly as we normally access in the server side methods.

2.       We can't access any variable declared in the code behind.

Advantage: PageMethods is a simple lightweight way to submit/fetch data to the server using ASP.NET AJAX. This doesn't submit whole page data to the server and also as opposed to the ASP.NET AJAX call back this doesn't even fire the Page_Load and other Page events of the code behind page.




Tuesday, 15 September 2009 20:24:25 (GMT Daylight Time, UTC+01:00)  #    Comments [3] -
.NET
# Saturday, 01 August 2009

As I started getting too many spams because of bots, I implemented Completely Automated Public Turing test to tell Computers and Humans Apart (CAPTCHA) in all the interactive pages of my site.

 

Took the control from here http://www.codeproject.com/KB/custom-controls/CaptchaControl.aspx, and customized according to my needs. The code was easy to understand and customize.

Saturday, 01 August 2009 18:45:44 (GMT Daylight Time, UTC+01:00)  #    Comments [0] -
.NET
# Tuesday, 16 June 2009

I got a chance to work on the below documentation softwares recently, were pretty good. There might be some other softwares better than these, if so, let me know.

  1. SQLSpec – For database documentation, it supports various databases like MS SQL Server, Oracle, Access, DB2, Sybase etc. It is very easy to use, however, customizations like excluding objects and xml commenting took me sometime. It creates MSDN help file style documents. Download link - http://www.elsasoft.org/
  2. SandCastle – Free software, for .NET project documentation. Supports .NET 1.1, 2.0, 3.0 and 3.5.  It is also very easy to use and creates MSDN help file style documents.  Download it from here http://www.codeplex.com/Sandcastle and install it, and then install SandCastle Help File Builder from here http://www.codeplex.com/SHFB

Tuesday, 16 June 2009 18:44:48 (GMT Daylight Time, UTC+01:00)  #    Comments [0] -
.NET | Softwares
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