Dot Net Code Snippets

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();

Google Custome Search

Google provider Custom search - that can be integrated to our own site - to searh a text,keywords
inside our site.

This is the link go Through and add to your site.

http://code.google.com/apis/customsearch/docs/ui.html

Good Friday to all.

Now i am going to show how to create  a Tooltip using Javascript there are many scripts,JQuery available to make the work easy and even we can design the tooltip stylish manner.

But finally i have worked with this sample , it shows tooltip , when u click on the Textbox - you can give your own font color, backcolor.

Here is the link Check it

http://lixlpixel.org/javascript-tooltips/

And its a dynamic tool tip..

http://blog.devarchive.net/2008/04/advanced-tooltip-control-aspnet-ajax.html

Here is the Screenshot

I have situation Create a Roundcorner for the table or div or panel ...
So in Ajax there is a built-in-control - RoundCornerExtender is available , but i have used that but i was not showing the round corner sometimes properly.

so i found this Nifty round corner was the good one, no image needed for the Round Corner.

Its full javascript., you can apply the round corner to div,panel,table etc..

Here is the Sample code

First you have to add Javascript on your page. You can get the javascript here ie: niftycube.js and niftycorner.css.

http://www.html.it/articoli/nifty/index.html

http://www.html.it/articoli/niftycube/index.html

You have to write code like this

if you use id use (#) , if you are going to use it for class user (.)

<script type="text/javascript">
window.onload=function(){
Nifty("div#box","big");
Nifty("Panel#" + '<%= contactUs_Panel.ClientID %>',"transparent");
Nifty("Panel.setround","big");
Nifty("Panel#" + '<%= callback_Panel.ClientID %>',"transparent");
Nifty("table.setround","big");

//Nifty("PopupControlExtender","big");
}
</script>

Hi , Now i am going to discuss about how to validate a Indian Mobile Number.

First the Mobile Number field should not be null so for that - Add RequiredFieldValidator.

It should not accept any Aplhabets , or any special characters for this you have to write RegularExpression Validator to Accept only Numbers
EX:

Regex:  \d+