C# Discussion Boards - CodeProject

gottimukkala20-Jan-10 10:22

20-Jan-10 10:22

Hi

I need to validate the email addresses to check if they are existing or not.
I used the following code to check first for the validation of domain but it failed with the following exception : A connection attempt failed because the connected party did not properly respond after a certain period of time, or established connection failed because conencted host has failed to respond 209.85.135.17:25

Here I used 25 port but is that port valid or i have to use someother port.

string address = "test@g.com";
string[] host = (address.Split('@'));
string hostname = host[1];
     
IPHostEntry IPhst = Dns.Resolve(hostname);
IPEndPoint endPt = new IPEndPoint(IPhst.AddressList[0], 25);
Socket s= new Socket(endPt.AddressFamily, 
        SocketType.Stream,ProtocolType.Tcp);
s.Connect(endPt);

Can anyone please help me. Any Ideas please!! I need it urgently.

Thanks in advance,

--
http://ashakthi.blogspot.com
http://kids-articles.blogspot.com

Re: Problem with connection to Socket

Rozis20-Jan-10 13:02

Rozis

20-Jan-10 13:02

In my country many providers block port 25 to reduce spam. tried another?

Re: Problem with connection to Socket

Abhinav S20-Jan-10 17:51

Abhinav S

20-Jan-10 17:51

This will also depend on the firewall settings on your network setting etc.

Now...bring me that horizon. And really bad eggs...Drink up me hearties, YO HO!

reading message by pop3

mohd_mogaly20-Jan-10 10:20

mohd_mogaly

20-Jan-10 10:20

Hi men and womens
I want to reading email message by C#
and as you know the c# dont apply the pop3 protocol
so I used The Tcp class to connect and reading message from the server
But the problem is when I try to read the message ,it read all the content of the message
as Message Id and some html tages
so
How can I read The Body Or Subject only
because I want to use form to Show From ,To,Subject,Body only so how Frown | :(

and thanks so so so so so much

Re: reading message by pop3

Rozis20-Jan-10 13:55

Rozis

20-Jan-10 13:55

Such email message is a file containing:

- a header
- a blank line
- the body (in ascii, can be empty)
- followed with 0 or more attachments

Rfc 822 descibes this and http://www.ietf.org/rfc/rfc2045.txt?number=2045[^] descibes the attachments (also read 2046,2047,2048)

Because many people use an email-client that produces a html-version of the body, these messages will have an ASCII-version in the body and the html-version as an (hidden) attachment. Sometimes the body is empty and there's only an attachment.

Hope this answers your question.

XLinq question

Jamie Nordmeyer20-Jan-10 10:18

Jamie Nordmeyer

20-Jan-10 10:18

My apologies if something like this has already been asked and answered; I did some Google searching, as well searching on this site, and didn't find it, so here goes. I'm new to the world of .NET 3.5 and Linq. What I have are 1 + n xml files. The first Xml file looks sort of like this:

<files>
   <file id="1" name="(some guid)"/>
   <file id="2" name="(some guid)"/>
</files>

There are then files in the same directory, whose name matches the guid plus .xml, like so:

<file id="1">
   <prop1>Value 1</prop1>
   <prop1>Value 1</prop1>
   <prop1>Value 1</prop1>
</file>

What I'd like to be able to do is this: for each file listed in the first xml blob, I want to create an object based on the values in each of the other xml files that look like the 2nd blob, and return that as an IEnumerable<Thing>. Does anybody know where I can find an example of how to do this?

Thanks in advance.

Jamie Nordmeyer
Portland, Oregon, USA
http://www.feralcodemonkies.com

Connecting windows application to a web server. [modified]

amnewone20-Jan-10 7:58

amnewone

20-Jan-10 7:58

Greetings

I want to build a windows application that can connect to a webserver to get user authentication. Just like any IM msngr. We install the windows application and later it connects to internet to get authentication. How can I make such application???

Plz help.

modified on Wednesday, January 20, 2010 2:06 PM

Opening a file

Darrall20-Jan-10 7:03

Darrall

20-Jan-10 7:03

Can anyone tell me why when writing code to open a file you use a forward slash in the path name instead of a back slash as in the following:

private void button1_Click(object sender, EventArgs e)
        {
            string file_name = "C:/test1.txt";

            System.IO.StreamReader objReader;
            objReader = new System.IO.StreamReader(file_name);

            textBox1.Text = objReader.ReadToEnd();

            objReader.Close();
        }

Re: Opening a file

loyal ginger20-Jan-10 7:29

loyal ginger

20-Jan-10 7:29

Because it's easy to type!

In this case the slash ("/") and backslash ("\") are both understood as the delimiter for path, so either one should work. However, backslash is used to escape in string literals, so to use backslash, you should escape it, like so: \\. You can see that is more typing than using just slash.

If you have a lot of backslashes in your string literal, you can put @ in front of it so you don't need to escape them. For example,

string file_name = @"C:\test1.txt";

Still, there is the character @ you have to type. It's still more typing than simply using the forward slash.

Re: Opening a file

Darrall20-Jan-10 7:36

Darrall

20-Jan-10 7:36

Thanks

Re: Opening a file

John Whitmire20-Jan-10 7:33

John Whitmire

20-Jan-10 7:33

My guess is that it's simply a cheat to avoid having to type the requisite double backslash (special character):

string file_name = "C:\\test1.txt";

...Byte conservation; it's one byte shorter in the source file. Poke tongue | ;-P

Re: Opening a file

Darrall20-Jan-10 7:37

Darrall

20-Jan-10 7:37

Thanks

That's the problem with using tutorials...nobody around to answer the howcomes.

Re: Opening a file

Dan Mos20-Jan-10 7:33

Dan Mos

20-Jan-10 7:33

Darrall wrote:
string file_name = "C:/test1.txt";

Because it works Smile | :)

. It transforms into "C:\\test1.txt";
But I don't. I use either

@"C:\test1.txt";//or
"C:\\test1.txt";

Re: Opening a file

Darrall20-Jan-10 7:43

Darrall

20-Jan-10 7:43

Thanks

Re: Opening a file

Abhinav S20-Jan-10 17:55

Abhinav S

20-Jan-10 17:55

Reading this article might give you some more information.

Now...bring me that horizon. And really bad eggs...Drink up me hearties, YO HO!

Insert image

farokhian20-Jan-10 7:02

farokhian

20-Jan-10 7:02

Hi all
In my program i want to get image from users and insert it into mydatabase .
Now i want to know how can i insert image into database?
Thx alot for your attention.

Re: Insert image

loyal ginger20-Jan-10 7:31

loyal ginger

20-Jan-10 7:31

You can conduct a search on "blob and database". An image can be treated as a blob (binary large object). Database tables can have blob fields. They can be used to hold images.

Re: Insert image

farokhian20-Jan-10 9:30

farokhian

20-Jan-10 9:30

Thx for your reply.
I can't understand your answer.
I want to insert an image to sql server database.
How can i do it?

Re: Insert image

loyal ginger20-Jan-10 10:09

loyal ginger

20-Jan-10 10:09

It's easy. Take a look at this:

http://www.databasejournal.com/features/mssql/article.php/3719221/Storing-Images-and-BLOB-files-in-SQL-Server.htm[^]

Connection to SQL Server on the remote computer

Ievgeniia Zhovtobryukh20-Jan-10 6:09

Ievgeniia Zhovtobryukh

20-Jan-10 6:09

Hi!

I am trying to deploy the application on Windows CE 6.0 platform. However, when it comes to connection to SQL Server on my laptop it "thinks" for a while and I receive the following error:

An unhandled exception of type 'System.Data.SqlClient.SqlException' occurred in System.Windows.Forms.dll

Additional information: SqlException

I tried to find out the root of the problem and found out that my code

static string connectionString = "Data Source=192.168.2.132; Initial Catalog=MDetectorDatabase; Integrated Security=true";

private void SubmitButton_Click(object sender, EventArgs e)
        {
            string login = this.loginTextBox.Text;
            string passw = this.passwTextBox.Text;
            string user = "";

            SqlConnection loginConnection = new SqlConnection(connectionString);
            string loginquery = "SELECT * FROM Doctors Where UserName='" + login + "';";
            SqlCommand loginCommand = new SqlCommand(loginquery, loginConnection);

            loginConnection.Open();

            SqlDataReader loginReader = loginCommand.ExecuteReader();
            ...
        }

broke on loginConnection.Open(); line showing the problem 'loginConnection.ServerVersion' threw an exception of type System.InvalidOperationException'

Does anybody know how to fix this problem?

Creating Dataset from Xml

Fayu20-Jan-10 4:50

Fayu

20-Jan-10 4:50

Hello all,

I am having a problem when trying to load a dataset with xml using ReadXml or ReadXmlSchema methods. The error I get is "DataSet doesn't allow the circular reference in the ComplexType named 'EDElementType'". The xml is below.

I think it is due to the fact that the complex type EDElementType contains a element named 'children' of type EDElementType which would cause a 'circular reference'. Any ideas how I can fix this?

Thanks in advance.

Xml:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:cbe="http://www.abccorp.com/cbe" targetNamespace="http://www.abccorp.com/cbe" version="1.0.1" elementFormDefault="qualified">
  <xsd:complexType name="CBEType">
    <xsd:sequence>
      <xsd:element name="edElements" type="cbe:EDElementType" minOccurs="0" maxOccurs="unbounded" />
    </xsd:sequence>
  </xsd:complexType>
  <xsd:element name="CBE" type="cbe:CBEType" />

<xsd:complexType name="EDElementType">
    <xsd:sequence>
      <xsd:choice>
        <xsd:element name="values" minOccurs="1" maxOccurs="unbounded">
          <xsd:simpleType>
            <xsd:restriction base="xsd:string">
              <xsd:maxLength value="1024"></xsd:maxLength>
            </xsd:restriction>
          </xsd:simpleType>
        </xsd:element>
        <xsd:element name="hexValue" type="xsd:hexBinary" minOccurs="1" maxOccurs="1" />

      </xsd:choice>
      <xsd:element name="children" type="cbe:EDElementType" minOccurs="0" maxOccurs="unbounded" />
    </xsd:sequence>
  </xsd:complexType>

</xsd:schema>

Re: Creating Dataset from Xml

Ennis Ray Lynch, Jr.20-Jan-10 10:17

Ennis Ray Lynch, Jr.

20-Jan-10 10:17

I like going the reverse direction when creating a Data Set for use with MS tools. Ie, create a data set in code using the object methods to assign types and relationships and then save the Data Set to an XML file. You will then have a sample Data Set that MS will support.

Need custom software developed? I do custom programming based primarily on MS tools with an emphasis on C# development and consulting.

A man said to the universe:
"Sir I exist!"
"However," replied the universe,
"The fact has not created in me
A sense of obligation."
--Stephen Crane

Re: Creating Dataset from Xml

Fayu21-Jan-10 3:14

Fayu

21-Jan-10 3:14

I ended up using xsd.exe, which worked. Go figure.

Deleted controls still appear in InitializeComponents()

yeah100020-Jan-10 4:49

yeah1000

20-Jan-10 4:49

Hi, i have the following question. When i add a control to my form it gets some automatic code in the InitializeComponents method in Designer.cs. When i delete the control from my form the code will still be there. Is there an automatic way to remove the unused control declarations from InitializeComponents?

TY

Re: Deleted controls still appear in InitializeComponents()

Rick Shaub20-Jan-10 5:57

Rick Shaub

20-Jan-10 5:57

Try building using "clean" then "rebuild".

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