ASP.NET

listbox loading from database

7-Feb-08 2:30

Just add this line of code in the head of your html page

<br />
<head><br />
<meta http-equiv="Expires" CONTENT="0"><br />
<meta http-equiv="Cache-Control" CONTENT="no-cache"><br />
<meta http-equiv="Pragma" CONTENT="no-cache"><br />
</head><br />

Again you can do it from server side by
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetExpires(DateTime.Now); //or a date much earlier than current time
Add at the every page

Thanks and Regards
Sandeep

If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Vinay Dornala7-Feb-08 1:56

Vinay Dornala

7-Feb-08 1:56

Hi,

I have source and destination listboxes and button ,

Click on selected items are moved from source to destination i did this thing with javascript it is working fine,
There is one button that is get postback, so that the selected items from source listbox. both listboxes are populated again from database.

how do we stop reloading listbox from database again

Re: listbox loading from database [modified]

Imran Khan Pathan7-Feb-08 2:01

Imran Khan Pathan

7-Feb-08 2:01

You can use return statement in javascript and return false if you dont want postback.

please don't forget to vote on the post that helped you.

Sandeep Akhare7-Feb-08 2:33

7-Feb-08 2:33

Might be the reasone behind it is you are populating the listbox on every postback just check Ispostback property when page is first time loaded populate listbox else no need to populate listbox again, if viewstate is enabled.

Thanks and Regards
Sandeep

If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

modified on Thursday, February 07, 2008 8:39:15 AM

Vinay Dornala7-Feb-08 2:51

Vinay Dornala

7-Feb-08 2:51

Hi sandeep,

This is the code i have written in page_load

When i click on button page get postback, and the code inside if is not executed as said but listbox2 items which i have selected from listbox1 is lost.

If Not Page.IsPostBack Then
Dim months1() As String = {"January", "February", "March", "April", "May", "June", "July"}
Dim months2() As String = {"a", "b", "c", "d"}
Me.ListBox1.DataSource = months1
Me.ListBox1.DataBind()
ListBox2.DataSource = months2
ListBox2.DataBind()

End If

Thanks in advance

Sandeep Akhare7-Feb-08 3:20

7-Feb-08 3:20

Check viewstate of your page
<%@ Page Language="C#" EnableViewState="true" should be true

Thanks and Regards
Sandeep

If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Vinay Dornala7-Feb-08 17:48

Vinay Dornala

7-Feb-08 17:48

yes it true,

still iam refeshing listboxes

Sandeep Akhare7-Feb-08 18:37

Re: Unregister Client script

7-Feb-08 18:37

Now i don't know whats happening wrong there might be at application level the viewstate is false.

Thanks and Regards
Sandeep

If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Unregister Client script

dews turner7-Feb-08 1:55

dews turner

7-Feb-08 1:55

Hi,

I have registered a client script as
ClientScript.RegisterClientScriptBlock(this.GetType(), "script", "<script language='javascript'>alert(Hi..');</script>");

Now can I unregister this script.

Please give me a solution ASAP.

Vijay

pmarfleet7-Feb-08 2:19

pmarfleet

7-Feb-08 2:19

tovijay.shukla wrote:
I have registered a client script as
ClientScript.RegisterClientScriptBlock(this.GetType(), "script", "alert(Hi..');");

Now can I unregister this script.

There's no method to unregister a script. The solution is not to register the script in the first place.

tovijay.shukla wrote:
Please give me a solution ASAP.

Hey, this is a free forum. You're not paying people for their help, so show some respect and be prepared to wait.

Paul Marfleet

"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush

problem in window application

Prashant B. Lavate7-Feb-08 1:00

Prashant B. Lavate

7-Feb-08 1:00

hi i want to set size of form according to system resolution ... how to do that in windows application

Thanks & Regards,
Prashant B. Lavate
Software Engineer
Mobile : +919423872257
Pune(India)

Wrong forum

pmarfleet7-Feb-08 2:20

pmarfleet

7-Feb-08 2:20

Prashant B. Lavate wrote:
hi i want to set size of form according to system resolution ... how to do that in windows application

Did you not notice that this is the ASP.NET forum?

Paul Marfleet

"No, his mind is not for rent
To any God or government"
Tom Sawyer - Rush

how to embed image in a xml file??

Tridip Bhattacharjee7-Feb-08 0:54

Re: how to embed image in a xml file??

7-Feb-08 0:54

how could i embed image in a xml file. plzz provide sample code or url from where i can get the code.

tbhattacharjee

Sandeep Akhare7-Feb-08 1:11

Re: how to embed image in a xml file??

7-Feb-08 1:11

Not having the code but i think you need to convert image into Binary then store that binary into xml file in perticualer node

Thanks and Regards
Sandeep

If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Joachim Kerschbaumer7-Feb-08 5:38

Joachim Kerschbaumer

7-Feb-08 5:38

you´ll get into some problems when storing binary data in your xml file.
i guess the standard way performing this would be encoding your image
data to base64, store the base64 data in a CDATA node
and when you want to get back to your image, base64 decode it and you
have your image data back.

to convert your Bitmap to a base64 string try something like

<br />
private string ImageToBase64(Image image)<br />
{            <br />
    MemoryStream ms = new MemoryStream();<br />
    image.Save(ms, ImageFormat.Bmp);<br />
    string base64 = Convert.ToBase64String(memory.ToArray());<br />
    ms.Close();<br />
    return base64;<br />
}

and the other direction

private Bitmap Base64ToImage(string base64)<br />
{<br />
    MemoryStream memory = new MemoryStream(Convert.FromBase64String(base64));<br />
    Bitmap bitmap = new Bitmap(memory);<br />
    memory.Close();<br />
    return bitmap;<br />
}

Re: how to embed image in a xml file??

Tridip Bhattacharjee19-Feb-08 18:03

how to encode and decode image data using base64 logic??

19-Feb-08 18:03

thanks a lot for great code.

tbhattacharjee

Tridip Bhattacharjee7-Feb-08 0:44

Re: how to encode and decode image data using base64 logic??

7-Feb-08 0:44

suppose i have image binary data in a string and i want to encode that data applying base64 logic and as well as how can i decode that image data. plzz give me some sample code.

tbhattacharjee

Sandeep Akhare7-Feb-08 1:02

Re: how to encode and decode image data using base64 logic??

7-Feb-08 1:02

If your converting Byte to string then don't convert it
just use Convert.ToBase64String(inArray, 0, inArray.Length,
Base64FormattingOptions.InsertLineBreaks);
If you are using string convert it to byte then try this

Thanks and Regards
Sandeep

If If you look at what you do not have in life, you don't have anything,
If you look at what you have in life, you have everything... "

Tridip Bhattacharjee19-Feb-08 18:02