C# Discussion Boards - CodeProject

Re: how to Merge two datatables in a dataset

Russell Jones16-Mar-09 1:56

16-Mar-09 1:56

I guess the straight forward way would be to loop through one table and for each row copy its data and all the related rows into the new table.

Any idea why this error appears (SEH Exception)

Matjaz-xyz16-Mar-09 1:31

Matjaz-xyz

16-Mar-09 1:31

I get http://www.postimage.org/image.php?v=Pq1N1qmr[^] <- this error on one of the computers.

Dont know why.

this is the code:

try
            {
                label12.ForeColor = Color.Black;
                string dbConnComm = "INSERT INTO Vnosi ([Dostava],[Skatla],[Barkoda],[Oznaka],[Skener],[Operater],[Datum],[PosnetkiV3],[PosnetkiM3],[Opombe]) VALUES ("
                + cmbDostava.Text + ", "
                + cmbSkatla.Text + ", '"
                + cmbBarkoda.Text + "', '"
                + cmbEnota.Text + "', '"
                + cmbSkener.Text + "', '"
                + cmbOperater.Text + "', '"
                + cmbDatum.Text + "', "
                + txtVA3.Text + ", "
                + txtMA3.Text + ", '"
                + txtOpombe.Text + "')";


                SqlConnection dbConn = new SqlConnection(sqlConnection);
                dbConn.Open();

                SqlCommand dbComm = new SqlCommand(dbConnComm, dbConn);
                dbComm.ExecuteNonQuery();
                dbConn.Close();
                label12.Text = "Uspešno vnešeno";
            }
            catch(Exception ex)
            {
                label12.ForeColor = Color.Red;
                label12.Text = "Napaka pri vnosu";

                MessageBox.Show("Napaka: " + ex.ToString());
            }

PC has framework 2.0 and 1.1

Re: Any idea why this error appears (SEH Exception)

Michael Bookatz16-Mar-09 1:38

Michael Bookatz

16-Mar-09 1:38

A few quick question to help try find the answer.

Have you tried the insert into the database directly and dose it work?
What is the connection string you are using as it appears to be a connection issue?
Can you connect to the database from that machine?

Why are you using an insert? you should look at using a stored procedure as direct sql asks for an injection attack.

Re: Any idea why this error appears (SEH Exception)

Giorgi Dalakishvili16-Mar-09 2:29

Giorgi Dalakishvili

16-Mar-09 2:29

Don't use concatenation for building sql queries, it's dangerous. Read more here: Parametrized Queries VS String Concatenation[^]

Giorgi Dalakishvili

#region signature
My Articles

Asynchronous Registry Notification Using Strongly-typed WMI Classes in .NET [^]

My blog
#endregion

Re: Any idea why this error appears (SEH Exception)

Matjaz-xyz17-Mar-09 3:35

Matjaz-xyz

17-Mar-09 3:35

Yes Giorgi, thank you for your information on security about SQL injections.

I just needed an anwser which was more than funny. The SQL Connection string was wrong.
And its my bad that i forgot to mention that this error occurs only on computers which have low-access accounts in our domain. Now i've fixed this and it works.

HopingToCode was right. I should check the connection string. Which i did today.

Thank you both for your time.

Regards,
Matjaž

Application.Idle Event

saksp16-Mar-09 0:02

saksp

16-Mar-09 0:02

I am not able to attach Application.Idle event with the event handler. what will be the reasons??

thanks

Re: Application.Idle Event

DaveyM6916-Mar-09 0:20

DaveyM69

16-Mar-09 0:20

saksp wrote:
what will be the reasons

Maybe you're doing it wrong?

This works for me.

using System;
using System.Windows.Forms;

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        Application.Idle += new EventHandler(Application_Idle);
    }

    // this method called when Idle event is raised
    void Application_Idle(object sender, EventArgs e)
    {
        // Do your thing
    }
}

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)

Re: Application.Idle Event

#realJSOP16-Mar-09 2:34

#realJSOP

16-Mar-09 2:34

saksp wrote:
I am not able to attach Application.Idle event with the event handler. what will be the reasons??

You're doing it wrong.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Transparent through the label

CodingLover15-Mar-09 23:00

CodingLover

15-Mar-09 23:00

Hi all,

On VS2005, I've add a background image on a form, fine. But when I added a label cannot see the image through it. How can I see the image through the label?

Thanks a lot.

I appreciate your help all the time...
CodingLover Smile | :)

Re: Transparent through the label

Christian Graus15-Mar-09 23:22

Christian Graus

15-Mar-09 23:22

Make the background color of the label transparent ? The other way is to draw the text on the form yourself.

Christian Graus

Driven to the arms of OSX by Vista.

Re: Transparent through the label

Wael Dalloul15-Mar-09 23:23

Wael Dalloul

15-Mar-09 23:23

CodingLover wrote:
How can I see the image through the label?

set the Backcolor for the label to: Transparent

label.Backcolor = Transparent

Re: Transparent through the label

Michael Bookatz15-Mar-09 23:41

Michael Bookatz

15-Mar-09 23:41

You set the label to transparent, However be aware that there is no true transparency in .net which means that transparent shows the background image and not the image underneathe.

handle shorcut Ctrl+V event on AxWebBrowser

sonukadole15-Mar-09 22:53

sonukadole

15-Mar-09 22:53

I am using AxWebBrowser control on windows form. I want to handle the shortcut paste(ctrl + V) event so that i can excute my own customised function to perform this operation.

I tried this as following:

private void editorWebBrowser_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
 {
       if (e.KeyData == (Keys)Shortcut.CtrlV)
       {  
              MyTextPasteFunction();
       }
        base.OnPreviewKeyDown(e);
  }

But it is not stopping executing it's default paste event. So Ctrl + V is pasting the contents twice.
What should i do to stop the default paste event execution?

Thanks in Advance.

Re: handle shorcut Ctrl+V event on AxWebBrowser

Pete O'Hanlon15-Mar-09 23:11

Pete O'Hanlon

15-Mar-09 23:11

You could always inject an onpaste handler in the webpage immediately after it has been loaded.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys

Re: handle shorcut Ctrl+V event on AxWebBrowser

sonukadole15-Mar-09 23:15

sonukadole

15-Mar-09 23:15

To elaborate further ,i am working on Content management system and I have embedded the AxWebBrowserControl on Windows form.

Re: handle shorcut Ctrl+V event on AxWebBrowser

Pete O'Hanlon15-Mar-09 23:26

Pete O'Hanlon

15-Mar-09 23:26

When the web page has finished loading, you could inject some javascript into the page that handled the onpaste function.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys

Re: handle shorcut Ctrl+V event on AxWebBrowser

sonukadole16-Mar-09 0:09

sonukadole

16-Mar-09 0:09

I am working on content management system and the axwerbbrowser is nothing but HTML editor control

Re: handle shorcut Ctrl+V event on AxWebBrowser

Pete O'Hanlon16-Mar-09 2:47

Pete O'Hanlon

16-Mar-09 2:47

So, create a minimal webpage with the onpaste function already in it.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys

Preserving row pointer across an database update via a datatable

jrgrobinson15-Mar-09 22:29

jrgrobinson

15-Mar-09 22:29

I am doing an update to my database after adding a row to the data table. The TableAdapter uses the VS2005 generated INSERT command (the table has a lot of columns). The line is...

DishVarTA.Update(CurrentStDishVarRow);

where 'CurrentStDishVarRow' points to the row in the 'Added' state.

My problem is that I want to use the row data after this statement to format and send off to some machinery. After the Update however 'CurrentStDishVarRow' points to an entirely different row.

I think the INSERT statement in the TableAdapter is putting the new row in at the beginning of the table so the row indexing changes.

Is there any way I could preserve the pointer, or is the only way to fill the table again and/or find it again?

Done a lot of searching and haven't found much that covers this, does that mean preserving row pointers across updates is not 'de rigeur'?

Thanks,

Re: Preserving row pointer across an database update via a datatable

Wael Dalloul15-Mar-09 23:19

Wael Dalloul

15-Mar-09 23:19

jrgrobinson wrote:
DishVarTA.Update(CurrentStDishVarRow);

This code will attempts to save changes in the indicated DataRow to the database.

You can store the row before updating and then manipulate the new instance of required row.
now to locate the row in the datatable before calling the update method for the dataadapter use one of this methods:

<br />
string s = "primaryKeyValue";<br />
DataRow foundRow = datatable.Rows.Find(s);

<br />
DataRow[] foundRows;<br />
foundRows = datatable.Select("put filter expression ");

Re: Preserving row pointer across an database update via a datatable

jrgrobinson16-Mar-09 0:23

jrgrobinson

16-Mar-09 0:23

Thanks. Just a simple question, after the update, could I assume the rows are all still in the TableAdapter and do the Find or Select then?

Thanks

Re: Preserving row pointer across an database update via a datatable

Wael Dalloul16-Mar-09 0:56

Wael Dalloul

16-Mar-09 0:56

TableAdapter don't store any rows, it just provide communication between your application and a database.
try to read this article to get more info:http://msdn.microsoft.com/en-us/library/bz9tthwx(VS.80).aspx[^]

The Datatable represents one table of data, so you should depend on the datatable to use the find or select methods.

Like what you do if you can't do what you like Smile | :)

Re: Preserving row pointer across an database update via a datatable

Mycroft Holmes15-Mar-09 23:25

Mycroft Holmes

15-Mar-09 23:25

You are using the built in wizard thingys to do your data processing and now you want to do something slightly different to the STANDARD methedology, like post processing after an insert. This is why they are a POS, I strongly suggest you read up on Data Access Layer and rework all your data processing.

As that is probably going to frighten the day lights out of you (as it would most people) try and capture the row information prior to saving back to the database (take a copy/clone of CurrentStDishVarRow) and see if you can work with that.

Never underestimate the power of human stupidity
RAH

Re: Preserving row pointer across an database update via a datatable

jrgrobinson16-Mar-09 0:19

jrgrobinson

16-Mar-09 0:19

I guess this is the problem with the 'standard methodology'. It is kinda hard comining into it to understand the conventions. There certainly isn't a lot except experience that would tell you an update rearranges the cache. A view from other worlds would be that a data cache wouldn't change after a write to the source, thus preserving some independance between the user and source.

Been doing a lot of reading and SQLCommands are looking attractive, but copying across the database update will get my machines working tomorrow.

Thanks for taking the time to respond.

Re: Preserving row pointer across an database update via a datatable

jrgrobinson16-Mar-09 1:44

jrgrobinson

16-Mar-09 1:44

Just to close it off for prosperity.

I have a data table, filled by a table adapter with '...WHERE(PK=@PK)'. It had a single row in it. I added another row (.NewRow, .AddRow). The Rows count of the table was 2. Index [0] pointed to the old origional data. Index [1] pointed to the new data, DataRowState=Added.

I then called the table adapter.update (a rather large INSERT statement)

There was still a count of two rows but both [0] and [1] pointed to the same row, the origional. This would indicate the data table of the dataset is no longer valid after an Update. I then did another fill and the data table had both rows as before (now unchanged state).

The reason for writing this is to record for other people that may fall into this minor but time consuming trap. The tableAdapter.Update call is the end of the road for the validity of the data table data. There isn't a lot of documentation or web resource that tells you this.

It maybe obvious to seasoned .NET database engineers, and maybe standard practice. It would be unexpected to new entrants in this field with experience of other, dare I say it, more normal, caching systems.

Thanks for the help.

Ooops, I modified Table Adapter to refer more correctly to the data table of the dataset where referring to storage.

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