how to use Client CallBack - ASP.NET Discussion Boards

Re: How can I correctly seize a resource with the Monitor class?

minhpc_bk3-Aug-06 16:16

3-Aug-06 16:16

Hi there. When you work on the resources, you may check out the ReaderWriterLock [^] object, and Jeffrey authored a good article on the topic.

http://msdn.microsoft.com/msdnmag/issues/06/06/ConcurrentAffairs/[^]

Re: How can I correctly seize a resource with the Monitor class?

HilSoft3-Aug-06 21:05

HilSoft

3-Aug-06 21:05

Thank you. The article, you've been referred to, just prevents of ReaderWriterLock using, and suggest to use the Monitor class instead.
But my problem (my question) is just about the Monitor class using: how can I use the nice class correctly? Please, help who knows.

HilSoft

Getting image url from gridview

Naveed Kamboh2-Aug-06 3:36

Naveed Kamboh

2-Aug-06 3:36

Hi Friends,
I am succesfully putting image to datagrid column and its working fine.
Can any one tell me please how can I get image url back from gridview column to
store in a variable.
Any help will be appricieated.
tahnks

Naveed Kamboh

Re: Getting image url from gridview

minhpc_bk2-Aug-06 15:25

minhpc_bk

2-Aug-06 15:25

You simply get reference to the image control and get the image url.

Re: Getting image url from gridview

Naveed Kamboh2-Aug-06 22:21

Naveed Kamboh

2-Aug-06 22:21

Dear its a imagecolumn in gridview, Can you help me how to get reference of that column.

Naveed Kamboh

Re: Getting image url from gridview

minhpc_bk3-Aug-06 16:00

minhpc_bk

3-Aug-06 16:00

Hi there. The ImageField of the GridView contains an Image control internally, you can first get reference to the GridViewRow using the GridView.Rows, then you can look at the specific cell of the row where the imagefield is defined, and you can find it out from the Controls collection of the cell.

How to use Microsoft agent characters in ASP.Net ?

King Shez2-Aug-06 2:35

King Shez

2-Aug-06 2:35

HI

can any one let me know that how to use Microsoft agent character in ASP.Net 2.0 , the character should be on the client side and the text which the character will speak will be dynamic(which will be get from the data base) and the gestures it will show will depend upon the values got from the data base.Please can any one let me know how to do it , if any one can provide the example , it would be great,
regards,
tippu

how to use Client CallBack

nannapanenikamalnath2-Aug-06 2:28

nannapanenikamalnath

2-Aug-06 2:28

hi,
iam having ASP application With two input fields Username,Password and one button on click of button user information should store in xml.
I want to implement this with "Client Call Back"
Client Call Back.
is any one know it please help me.

kamalnath

Re: how to use Client CallBack

minhpc_bk2-Aug-06 15:28

minhpc_bk

2-Aug-06 15:28

Client CallBack[^]

Image Control again showing same file?

MudkiSekhon2-Aug-06 2:27

MudkiSekhon

2-Aug-06 2:27

I am developing an application in ASP.NET 1.1. on one page I allow the user to upload and delete the files to the server.
When I delete the file, I physically delete the file from the location. Then I again prompt the user to load a new file but I save the file with the same name the earlier image file had been saved. The problem is that when I again upload the page through Response.Redirect after uploading, it is showing the same image it was showing before deletion whereas in that location on server, there is another image. How my view of the image in the Image Control will change when a new picture has come.

Please give me any suggestion. All your suggestion are welcome.

Thanks in advance

Thanks,
Sandeep S. Sekhon

Re: Image Control again showing same file?

minhpc_bk2-Aug-06 15:32

minhpc_bk

2-Aug-06 15:32

Looks like the image is cached. Can you see the new image if you refresh the web page? There are a couple of work-around options that you may try:
+ Use another name for the new image.
+ Use a seperate web page or custom http handler to read the image data and send it to the output stream.

How to return binary data from an aspx page?

Rob Philpott2-Aug-06 1:14

Rob Philpott

2-Aug-06 1:14

Hi all,

I want to return a binary file from my webserver in .NET, so I've created an aspx file to do this, I then have something like this:

protected void Page_Load(object sender, EventArgs e)
{
	Response.ContentType = "application/octet-stream";
	Response.AddHeader("Content-Disposition", "inline;filename=data.dat");
	using (BinaryWriter writer = new BinaryWriter(Response.OutputStream))
	{
		for (int x = 0; x < 100; x++)
		{
			writer.Write(x);
		}
	}
}

This works well in that I get my binary data and IE pops up a save file dialog, but the problem I have is that ASP.NET adds on a load HTML stuff to the end - the default output from an aspx page.

Does anyone know how I can prevent ASP.NET from adding this stuff to the end and corrupting my file?

Thanks for the help!

Regards,
Rob Philpott.

Re: How to return binary data from an aspx page?

Guffa2-Aug-06 2:20

Guffa

2-Aug-06 2:20

Remove the content of the page, so that it only contains the @Page directive.

---
b { font-weight: normal; }

Re: How to return binary data from an aspx page?

Rob Philpott2-Aug-06 2:47

Rob Philpott

2-Aug-06 2:47

Tried that - complains that there was no <HTML> tag.. ?

Regards,
Rob Philpott.

Re: How to return binary data from an aspx page?

Guffa2-Aug-06 5:29

Guffa

2-Aug-06 5:29

Who complains?

---
b { font-weight: normal; }

Re: How to return binary data from an aspx page?

eggsovereasy2-Aug-06 3:31

eggsovereasy

2-Aug-06 3:31

I have this code to get an image from a database and just shoot out the binary so I can use images from a database in a datagrid with template column and asp:images. So I can put "~/GetPic.aspx?id=X" in the ImageURL attribute of the asp image. Hope it helps.

<br />
int id = Convert.ToInt32(Request.QueryString["id"]);<br />
<br />
        Advertisement ad = new Advertisement(id);<br />
<br />
        Response.ClearContent();<br />
        Response.ContentType = "image/jpeg";<br />
        Response.OutputStream.Write(ad.Image, 0, ad.Image.Length);<br />
        Response.End();<br />
<br />

Re: How to return binary data from an aspx page?

Rob Philpott2-Aug-06 3:45

Rob Philpott

2-Aug-06 3:45

Perfect! Thank you. It's ages since I've done any ASP.NET stuff, and the line I was looking for was simply:

Response.End();

Regards,
Rob Philpott.

Estimating the time required to upload

Sheshadrinath2-Aug-06 0:46

Sheshadrinath

2-Aug-06 0:46

Hi,
I am doing a project in ASP.NET. I need to give the user to upload the documents through the website. While uploading the document, I would like to show the progress bar to show the status of the upload process. How can I do this?

With Regards,
Sheshadrinath.R

Re: Estimating the time required to upload

Paddy Boyd2-Aug-06 1:04

Paddy Boyd

2-Aug-06 1:04

You could have a look at these:

http://www.codeproject.com/aspnet/WebProgressBar.asp[^]

http://www.codeproject.com/useritems/InPageProgressWithCancel.asp[^]

Master - Detail / Diesplay Form View in Insert Mode when no Data in MasterGrid

Brokit1-Aug-06 22:53

Brokit

1-Aug-06 22:53

Hi there.

I have a GridView and a FormView. The FormView ObjectDataSource is listening to the Grid´s selected ID to display the detailed Data.

It is not visible before I select anything from die Grid.

What I would like to do is to show the FormView in Insert Mode, if there is no data in the Grid or no data has been selected yet. At the same time I´d like to display a message in the Grid if there is no data to display.

It would be nice, if someone could point me in the right direction Roll eyes | :rolleyes:

Thanks in advance,
Brokit

Re: Master - Detail / Diesplay Form View in Insert Mode when no Data in MasterGrid

minhpc_bk2-Aug-06 15:37

minhpc_bk

2-Aug-06 15:37

+ To display something when the datasource of the GridView control is empty you can use the EmptyDataText/EmptyDataTemplate properties of the control, you can read more about these in MSDN.
+ Also to change the default mode of the FormView to Insert, you simply check the datasource length, if you use the DataSource control with the GridView control you can do a checking on the select result in the Selected event, then change the mode of the FormView with the DefaultMode property or the ChangeMode method.

Placing images on runtime

Fahad Wali1-Aug-06 22:51

Fahad Wali

1-Aug-06 22:51

Hi
Urgent...How to place images on runtime? i do not know the number of images that will be placed on the page?

Re: Placing images on runtime [modified]

l0kke1-Aug-06 22:58

l0kke

1-Aug-06 22:58

Create <asp:Placeholder id="myPlaceHolder" runat=server">

and then in code you can do following

using Image = System.Web.UI.WebControls.Image;

for(int i=0; i < imageUrls.Count; i++)
{
Image myImage = new Image();
myImage.ImageUrl = imageUrls[i];
myPlaceholder.Controls.Add(myImage);
}

I didn't try it, but it should works

Pilo

Re: Placing images on runtime [modified]

Fahad Wali2-Aug-06 20:57

Fahad Wali

2-Aug-06 20:57

Thanx Pilo!!
It works.. Smile | :)

Now if u could help me with the placement of the PlaceHolder?

Thanx again. :>

Fahad

-- modified at 3:01 Thursday 3rd August, 2006

Re: Placing images on runtime

l0kke3-Aug-06 6:24

l0kke

3-Aug-06 6:24

Lol, how is it possible that it works, if you dont have a placeholder Smile | :)

just place it in your .aspx file, on place where you want to have images:

<body>
<form id="form1" runat="server">
<div>
<asp:Label runat="server" id="label1" Text="Here are my personal nude pics:"/>
<asp:Placeholder runat="server" id="myPlaceholder">
</asp:Placeholder>
</div>
</form>
</body>

Placeholder is not rendered on a page, it is just what its name says: placeholder. you can use it to reference a place in your page to work with it in your code. So when you put image controls into it, it will be rendered just as a collection of images.

Pilo

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