Dot Net Code Snippets

<add key="Set_Css" 

value="App_Themes/Default/Css1.css,App_Themes/Default/Css2.css"/>
  <add key="Set_Javascript" 
value="Javascripts/Js1.js,Javascripts/Js2.js,

http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"/>

<link   type="text/css" 
            rel="Stylesheet" 
            href="HttpCombiner.ashx?s=Set_Css&t=text/css&v=1" />

    <script     
        type="text/javascript" 
        src="HttpCombiner.ashx?s=Set_Javascript&t=type/javascript&v=2" >
    </script>

Good Evening to All.
Here I am going to cover how to compress the .aspx pages.
so there are no.of ways to compress the pages in asp.net
1) using IIS.
2) using Code ie: through HTTPCompress.dll i got the source code from codeproject.com.
so i am going to share with you.
There are two type of Compression ie: Deflate , GZIP. here i am going to use GZIP compression to compress the asp.net pages.
First Place the DLL file ie::HTTPCompress.dll to the Bin folder of your project.
Then you have to include some tag on web.config file

<configsections>
  <sectiongroup name="Flanders">
   <section name="HttpCompress" type="Flanders.Library.Modules.HttpCompress.Configuration, HttpCompress">
  </section>
 </sectiongroup>
<flanders>
  <httpcompress compressiontype="GZip">
   <excludedpaths>
    <add path="NoCompression.aspx">
   </add>
   <excludedmimetypes>
    <add mime="image/jpeg">
   </add>
  </excludedmimetypes></excludedpaths>
</httpcompress>
</flanders>

</configsections>

<excludedmimetypes>
  <add mime="image/jpeg">
  <add mime="image/jpg">
  <add mime="image/png">
  <add mime="image/gif">
</add>
</add>
</add>
</add>
</excludedmimetypes>

<httpmodules>
   <add> name="HttpCompressModule" type="Flanders.Library.Modules.HttpCompress.HttpModule,HttpCompress"/>
 </add>
</httpmodules>

Some members asked this question on forums. Here is the Solution to overcome this issue.

When i am going to compress the .aspx pages using HTTPCompression, the postback will not works. Because it also compressing the Scripresource.axd, webresource.axd file.

To make the postback works in your project you do not compress the above two files, by adding these code.

Solution:

........,

<httpcompress compressiontype="GZip">
 <excludedpaths>
 <add path="scriptresource.axd">
 <add path="webresource.axd">
</add>
</add>
</excludedpaths></httpcompress>

..,
<excludedmimetypes>
 <add mime="image/jpeg">
 </add>
 </excludedmimetypes>

I saw the question repeatedly asking on forums ie: how to convert the String to datetime.

even if someone give solution still the problems exists..,

Error: String is not recognized as a valid DateTime.

Here i am giving the solution to overcome the problem.

First make sure whether you entered is a valid date or not because User may enter alphabets, special symbols etc.. so in order to avoid that , I have to validate the textbox. Here i am using the Regex to to validate the date.

This is my Article to vaildate date using Regex

try
{
 string sDate ="06/05/2010";
// this the regex to match the date ie: dd/MM/yyyy
 string _dateExpression = @"^((0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](?:19|20)\d\d)$";
 Regex chkDate = new Regex(_dateExpression);
 if ((chkDate.IsMatch(sDate))
 {
 // so if the date is valid and its matched you can store the date on DB or do some manipulatio.
 }
 else
 {
 // show invalid date
 }
}
 catch (System.FormatException ex)
 {
 // show invalid date
 }
catch(Exception ex1)
{
throw;
}

DateTime sDate = new DateTime();

sDate = DateTime.Today; //  Here i am getting like this 5/6/2010

// So i want this format 05/06/2010  - for this i am using Format to Convert the Date as i Want.

string gDate = String.Format("{0:dd-MM-yyyy}", sDate);

Good Morning to Everybody this is my First article.
Now i am going to see how to send email Asynchronously, actually we send email normally using asp.net Example check here..
Send Email Using ASP.NET

By default smtpClient has one method called SendAsync to send an email ansynchronously. so if you sending an email normally it will take some time for each mail sent. But if you send an email Asynchronously it will not wait for each mail sent it will do the other process , while mail sending is done at background process.
So Here is the code.

//creating mail message object
 MailMessage mailMessage = new MailMessage();
 mailMessage.From = new MailAddress("venkat@gmail.com");
 mailMessage.To.Add(new MailAddress("msdotnettechies@gmail.com"));
 mailMessage.CC.Add(new MailAddress("user1@gmail.com"));
 mailMessage.Bcc.Add(new MailAddress("user2@gmail.com"));
 mailMessage.Subject = "Email Checking Asynchronously";
 mailMessage.Body = "Email test asynchronous";
 mailMessage.IsBodyHtml = true;//to send mail in html or not

 SmtpClient smtpClient = new SmtpClient();//portno here
 smtpClient.Host = "smtp.gmail.com";
 smtpClient.EnableSsl = true ; //True or False depends on SSL Require or not
 smtpClient.Credentials = new NetworkCredential("yourGmail@gmail.com", "yourpassword");
 //smtpClient.UseDefaultCredentials = true; //true or false depends on you want to default credentials or not
 Object mailState = mailMessage;

 //this code adds event handler to notify that mail is sent or not
 smtpClient.SendCompleted += new SendCompletedEventHandler(smtpClient_SendCompleted);
 try
 {
 smtpClient.SendAsync(mailMessage, mailState);
 }
 catch (Exception ex)
 {
 Response.Write(ex.Message);
 Response.Write(ex.StackTrace);
 }

// this is the event called on main method
void smtpClient_SendCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
 {
 MailMessage mailMessage = e.UserState as MailMessage;
 if (e.Cancelled || e.Error != null)
 {

 Response.Write(e.Error.Message);
 Response.Write(e.Error.StackTrace);
 }
 else
 {
 Response.Write("Email sent successfully");
 }
 } 

 <meta http-equiv="PRAGMA" value="NO-CACHE"></meta>
<meta content="Mon, 01 Jan 1990 12:00:00 GMT" http-equiv="Expires"></meta>

System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.Append("<script language="javascript">");
sb.Append("window.open('popuop.aspx', 'CustomPopUp',");
sb.Append("'width=1020, height=750, left=0, top=0, menubar=no, toolbar=no, resizable=no, status=no, location=no, scrollbars=yes');<");
sb.Append("/script>");
Type t = this.GetType();
if (!Page.ClientScript.IsStartupScriptRegistered(t, "PopupScript"))
{
     Page.ClientScript.RegisterStartupScript(t, "PopupScript", sb.ToString());
 }

   <img border="0" id="img_PopUp" onclick="window.open('../PopUp.aspx','custompopop','width=250,height=300,toolbar=no,menubar=no,statusbar=no,resizable=no,scrollbars=no,location=no, directories=no,copyhistory=no,left=250,top=250')" />
                                runat="server" src="../Images/Newwindow.png" style="width: 35px" />

In this post i am going to show how to work with Arithmetic CAPTCHA. Generally we used , Alpha or alphaNumeric Captcha on most of the site but some site like  ASP.SNIPPETS it shows ARITHMETIC CAPTCHA like 18 + 12 = ? so user have to give correct value then only it proceeds.

Here I am getting help from this site

http://www.knowlegezone.com/documents/80/Simple-ASPNET-CAPTCHA-Tutorial/

Which was in VB.NET so I would like to Written in C#, here I have been posted , On the Above link they used normal ASPX image to Generate the Image ie: 18 + 12 = .

So i written the code on Generic Handler File to improve the site performance.
By default Handler file does not Read or write the value to Session so we have to use like this

using System.Web.SessionState;

public class Captcha : IHttpHandler, IRequiresSessionState

using System.Web.SessionState;

public class Captcha : IHttpHandler, IReadOnlySessionState

<%@ WebHandler Language="C#" Class="Captcha" %>

using System;
using System.Web;
using System.Drawing;
using System.Web.SessionState;
public class Captcha : IHttpHandler, IRequiresSessionState
{
    
    public void ProcessRequest (HttpContext context) {
        //context.Response.ContentType = "text/plain";
        //context.Response.Write("Hello World");
        Random num1 = new Random();
        Random num2 = new Random();

        int numQ1 = 0;
        int numQ2 = 0;
        string QString = null;


        numQ1 = num1.Next(10, 15);
        numQ2 = num1.Next(17, 31);


        QString = numQ1.ToString() + " + " + numQ2.ToString() + " = ";
        int tAnswer = numQ1 + numQ2;
        context.Session["answer"] = tAnswer .ToString ();
        Bitmap bitmap = new Bitmap(85, 25);
        Graphics Grfx = Graphics.FromImage(bitmap);
        Font font = new Font("Arial", 18, FontStyle.Bold, GraphicsUnit.Pixel);
        Rectangle Rect = new Rectangle(0, 0, 100, 25);

        Grfx.FillRectangle(Brushes.Snow, Rect);
        Grfx.DrawRectangle(Pens.White, Rect);
        // Border
        Grfx.DrawString(QString, font, Brushes.Black, 0, 0);
        context.Response.ContentType = "Image/jpeg";
        bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
        bitmap.Dispose();
        Grfx.Dispose();
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

}

// Getting Random number
        Random num1 = new Random();
        Random num2 = new Random();

        int numQ1 = 0;
        int numQ2 = 0;
        string QString = null;

        // here we get the random number for the first and second numer - ie: shows the number in between the range.
        numQ1 = num1.Next(10, 15);
        numQ2 = num1.Next(17, 31);

        //Total answer has been  stored it on String and assign to the Session["number"]
        QString = numQ1.ToString() + " + " + numQ2.ToString() + " = ";
        Session["answer"] = numQ1 + numQ2;

        // Here we create  Bitmap width - 85 and height - 25
        Bitmap bitmap = new Bitmap(85, 25);
        Graphics Grfx = Graphics.FromImage(bitmap);

        // Setting the font name, size etc for the text that we have to write it on the image
        Font font = new Font("Arial", 18, FontStyle.Bold, GraphicsUnit.Pixel);

        // Here we specify  a Rectangle object of x , y co-ordinate , with width and height 
        Rectangle Rect = new Rectangle(0, 0, 100, 25);

        //Fill the color to the Rectangle
        Grfx.FillRectangle(Brushes.Snow  ,Rect);

        // Now Using Pen Object Drawing a rectangle
        Grfx.DrawRectangle(Pens.White, Rect);

        // Border - here drawing the string of the num1 and num 2, font size , type etc, font color , and x and y co-ordinate
        Grfx.DrawString(QString, font, Brushes.Black   , 0, 0);
        // Specify the Content type of the image - here i am using JPEG
        Response.ContentType = "Image/jpeg";

        // Save the image and show it on page using response object
        bitmap.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

        //Dispose the object and release the resources
        bitmap.Dispose();
        Grfx.Dispose();