ASP.NET

pressing F5(refresh button)

28-Nov-07 20:15

You have make the html control a server control in order to access it on server side. Just make them runat=server and assign a ID to that control.

Apurva Kaushal

Sujit Mandal28-Nov-07 20:04

Sujit Mandal

28-Nov-07 20:04

In a registration page after clicking submit button when we are pressing F5(refresh button) it again fires the submit button events(code).why?plz tell me the reason.and also how i can prevent this situation.

thanks in adv.

Sujit

N a v a n e e t h28-Nov-07 20:12

N a v a n e e t h

28-Nov-07 20:12

Posted data will be kept in browsers cache, and when refresh is pressed, same data will be posted again which will invoke buttons event. To prevent this

1- After insertion to database, redirect to the same page. This will remove posted data from browser's cache
2 - Before insertion do a checking to verify that data is not duplicating.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

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Sujit Mandal28-Nov-07 23:39

Sujit Mandal

28-Nov-07 23:39

thanx for yours help.
But i hv still 1 problem.after redirect the page Ispostback property fires again but i don't need this.bcz i hv some logic in Ispostback which will fires only once.
thn how can i avoid this Ispostback.

Sujit

Michael Sync28-Nov-07 20:13

28-Nov-07 20:13

What I did in my project is that if the user clicks the submit button, I disable this button during the processing time.

You may check those article.
Preventing Duplicate Record Insertion on Page Refresh
Detecting Page Refresh By Altaf Al-Amin
Build Your ASP.NET Pages on a Richer Bedrock

Source: Useful Links - ASP.NET Page Refesh

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

_AK_28-Nov-07 20:16

28-Nov-07 20:16

Michael Sync wrote:
What I did in my project is that if the user clicks the submit button, I disable this button during the processing time.

But after the process is over and in case you are there in the same page and then refresh button is clicked again the same problem will occur. Smile | :)

Apurva Kaushal

Michael Sync28-Nov-07 21:02

28-Nov-07 21:02

Apurva Kaushal wrote:
But after the process is over and in case you are there in the same page and then refresh button is clicked again the same problem will occur.

No. I will be in the same page.. As the process is over, there won't be any data in the page or cache.

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

_AK_28-Nov-07 23:16

28-Nov-07 23:16

Michael Sync wrote:
No. I will be in the same page.. As the process is over, there won't be any data in the page or cache.

But what I think is even after the process is over and you have not cleared the data exclusively it will be available in the page, isn't it?

Apurva Kaushal

N a v a n e e t h28-Nov-07 23:26

N a v a n e e t h

28-Nov-07 23:26

Michael Sync wrote:
As the process is over, there won't be any data in the page or cache.

I guess you will be disabling the button using JS, right ? Then after the postback(may be insertion), if user hits refresh, the previous event will fire again. I don't think that disabling button will prevent this.

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

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_AK_28-Nov-07 23:28

.Net framework in windows 98

28-Nov-07 23:28

That is what I too was expessing that unless it has been cleared explicitly it won't be cleared.

Apurva Kaushal

GridView Calculation

komalcse28-Nov-07 19:46

komalcse

28-Nov-07 19:46

Hi,

i have placed the textboxes in the gridview
i have used the dropdownlist out of the grid,if i select am item from dropdown list 2 if my textbox in grid view will be filled and i have to enter an value in the another textbox and if i use tabkey it should multiply the values in the 2 textbox and display the value in the another textbox

can anyone help plz

thanks in anvance

Re: GridView Calculation

MaruBindiya29-Nov-07 2:17

MaruBindiya

29-Nov-07 2:17

can u give ur exact requrement or code.
coz frm ur post m nt getng how many rows r there in ur grid.
if three den it would b easy to do so..

Re: GridView Calculation

decokin20-Sep-08 21:34

decokin

20-Sep-08 21:34

i have a textbox name quantity in which the user will put the value,and another textbox as usage ....
i need to multiply values in these two table
and dispaly the result in third textbox

Ravi_2128-Nov-07 19:27

Ravi_21

28-Nov-07 19:27

can i install .net framework in windows 98

Re: .Net framework in windows 98

Christian Graus28-Nov-07 19:30

Christian Graus

28-Nov-07 19:30

How is this an ASP.NET question ?

What did google tell you?

Christian Graus - Microsoft MVP - C++

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Re: Benefit of make the business layer class as sealed class

Michael Sync28-Nov-07 19:24

Re: Benefit of make the business layer class as sealed class

28-Nov-07 19:24

hogan.smith wrote:
Because they can never be used as a base class, some run-time optimizations can make calling sealed class members slightly faster.

then, maybe. Yes. Thanks. Anyway, I've been using the normal class since long time back.. I don't have any problem (including the performance issues) with those classes..

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

hogan.smith28-Nov-07 19:47

hogan.smith

28-Nov-07 19:47

I am not an expert but I think we are unable to calculate the performance difference

Regards,
Hogan

Re: Benefit of make the business layer class as sealed class

N a v a n e e t h28-Nov-07 19:52

N a v a n e e t h

28-Nov-07 19:52

Yes it will be bit tough to identify the performance problems. Do experiments with both methods, trace the results and check the execution timings. Also you can use any of the profilers available for .NET

All C# applications should call Application.Quit(); in the beginning to avoid any .NET problems.- Unclyclopedia

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Re: Benefit of make the business layer class as sealed class

hogan.smith28-Nov-07 21:16

hogan.smith

28-Nov-07 21:16

Yes you are correct Navaneeth Smile | :)

Uploading Multiple Files....

pavya_Cool28-Nov-07 19:23

pavya_Cool

28-Nov-07 19:23

Hi to All,

Here i am trying to upload multiple files on a server. This works fine for the files having size less than 4 to 5 MB, but whenever i trying to upload the file whos size is more than that it even does not take that file. Here i am using a List box to contain the files to be uploaded. the code for "add files" and "upload files" as follows....

//code for Add file Button
private void AddFile_Click(object sender, System.EventArgs e)
{
lblStatus.Visible=true;
lblStatus.Text="";
//call to HideControl()
HideControls(1);
bool b=true;

if (Page.IsPostBack == true)
{
listFileList.AutoPostBack=true;

// This function adds the selected files in the List Box.
// if the file is not selected then it dispalyes the error message.
// Check for the availability of the files in the FindFile control.
if (FindFile.Value!="")
{
if (listFileList.Items.Count!=0)
{
for (int i=0; i<listfilelist.items.count; i++)
="" {
="" b="true;
" if="" (findfile.postedfile.filename="=" convert.tostring(listfilelist.items[i]))
="" lblstatus.text="File already present in listbox" ;
="" break;
="" }
="" (b="=" true)
="" hif.add(findfile);
="" listfilelist.items.add(findfile.postedfile.filename);
=""
="" else
="" }="" end="" of="" if-else.
=""

="" sets="" the="" upload="" button="" caption
="" (listfilelist.items.count="">1)
Upload.Text= "Upload All";
else
Upload.Text= "Upload File";

listFileList.AutoPostBack=true;
}// end of AddFile_Click()

// Code for Upload file button
private void Upload_Click(object sender, System.EventArgs e)
{
if (!IsPostBack==false)
{
HideControls(1);
//string stat1="";
string baseLocation = Server.MapPath("~/Files/Upload/");
string status = "";
if((listFileList.Items.Count == 0) && (filesUploaded == 0))
{
lblStatus.Text = "Error - a file name must be specified.";
return;
}// end of if
// call to CheckUploadFile() to check availability of the details of specified file
CheckUploadFile();
// if details of all files available then only it uploads these files
if (stat == "")
{
HtmlInputFile HIF = new HtmlInputFile();
foreach(System.Web.UI.HtmlControls.HtmlInputFile HIF1 in hif)
{
string fn = ln + "-" + System.IO.Path.GetFileName(HIF1.PostedFile.FileName);
if (File.Exists(baseLocation+fn)==false)
{
HIF1.PostedFile.SaveAs(baseLocation + fn);
UpdateCheck(fn, j);
filesUploaded++;
status += fn + "
";
}
else
{
filesExists++;
stat1 += fn + "
";
}
j++;
}// end of foreach
}
// else it will shows the error message
else
{
lblStatus.Text = "The details for following file(s) were not available. Please enter the details & try again.:
" + stat;
stat = "";
return;
}//end of if-else
// after uploading all the files it shows the summary
if(filesUploaded == hif.Count)
{
lblStatus.Text = filesUploaded + " file(s) were uploaded:
" + status;

}//end of if
else
{
lblStatus.Text = filesUploaded + " file(s) were uploaded:
" + status + "
" + filesExists + " File already exist(s).....
" + stat1;
stat1="";

}
hif.Clear();
listFileList.Items.Clear();
}
}// end of Upload_Click()

Any body tell me what is the problem...?

Pravin

Re: Uploading Multiple Files....

Michael Sync28-Nov-07 19:36