Avoid adding a new record on refreshing the browser

[srinivas]

Hi,

I'm working with datagrid. And users can add "Remarks" by clicking the [Add]
link button in the footer template.

It's working fine like when the user enter the remarks and click on [Add],
the remarks are getting added.

But if we refresh the page, a new record is getting added, which should not
happen

I do not have any unique columns (other than Remark Id) in the table sine we
can add the remarks any number of times.

Any suggestion in this regards is highly appreciated.

srinivas

 

[Eliyahu Goldin]

That's built-in behavior of Refresh button. It always repeats the last
postback. You can't change it. You can protect against it on server side if
you include something like a timestamp in the postback. Then you can compare
the timestamp from the new postback with the one from the previous postback.
If they match, you got Refresh click.

Eliyahu

 

[MA]

I´m not sure aboute this, but can´t you use if(!Page.IsPostback) ?

/Marre

That's built-in behavior of Refresh button. It always repeats the last
postback. You can't change it. You can protect against it on server side
if
you include something like a timestamp in the postback. Then you can
compare
the timestamp from the new postback with the one from the previous
postback.
If they match, you got Refresh click.

Eliyahu

Hi,

I'm working with datagrid. And users can add "Remarks" by clicking the [Add]
link button in the footer template.

It's working fine like when the user enter the remarks and click on
[Add],
the remarks are getting added.

But if we refresh the page, a new record is getting added, which should not
happen

I do not have any unique columns (other than Remark Id) in the table sine we
can add the remarks any number of times.

Any suggestion in this regards is highly appreciated.

srinivas

 

[Eliyahu Goldin]

Marre,

Page.IsPostback will always return true after pressing Refresh for the
simple reason it IS a postback.

Eliyahu

I´m not sure aboute this, but can´t you use if(!Page.IsPostback) ?

/Marre

That's built-in behavior of Refresh button. It always repeats the last
postback. You can't change it. You can protect against it on server side
if
you include something like a timestamp in the postback. Then you can
compare
the timestamp from the new postback with the one from the previous
postback.
If they match, you got Refresh click.

Eliyahu

Hi,

I'm working with datagrid. And users can add "Remarks" by clicking the [Add]
link button in the footer template.

It's working fine like when the user enter the remarks and click on
[Add],
the remarks are getting added.

But if we refresh the page, a new record is getting added, which should not
happen

I do not have any unique columns (other than Remark Id) in the table

sine
we

can add the remarks any number of times.

Any suggestion in this regards is highly appreciated.

srinivas

 

[MA]

Hi Eliyahu!

Yes it will. Thats why i used !Page.IsPostback. Should´nt that solve the
problem with F5?

F5 is allways a postback. If you use:
if(!Page.IsPostback)
{
code.....
}
the code inside my if-block would not be used when F5 is pressed.

Is something I miss here, or could this work?

/Marre

Marre,

Page.IsPostback will always return true after pressing Refresh for the
simple reason it IS a postback.

Eliyahu

I´m not sure aboute this, but can´t you use if(!Page.IsPostback) ?

/Marre

That's built-in behavior of Refresh button. It always repeats the last
postback. You can't change it. You can protect against it on server
side
if
you include something like a timestamp in the postback. Then you can
compare
the timestamp from the new postback with the one from the previous
postback.
If they match, you got Refresh click.

Eliyahu

Hi,

I'm working with datagrid. And users can add "Remarks" by clicking the
[Add]
link button in the footer template.

It's working fine like when the user enter the remarks and click on
[Add],
the remarks are getting added.

But if we refresh the page, a new record is getting added, which
should
not
happen

I do not have any unique columns (other than Remark Id) in the table sine
we
can add the remarks any number of times.

Any suggestion in this regards is highly appreciated.

srinivas

 

[Eliyahu Goldin]

Marre,

The question is how you differentiate between a real postback caused, for
example, by a form button click, and a postback caused by F5. If you use
if(!Page.IsPostback), you are going to miss all your real postbacks.

What you are suggesting is good in a case when you don't have any real
postbacks, for example you are producing a view-only form.

Eliyahu

Hi Eliyahu!

Yes it will. Thats why i used !Page.IsPostback. Should´nt that solve the
problem with F5?

F5 is allways a postback. If you use:
if(!Page.IsPostback)
{
code.....
}
the code inside my if-block would not be used when F5 is pressed.

Is something I miss here, or could this work?

/Marre

Marre,

Page.IsPostback will always return true after pressing Refresh for the
simple reason it IS a postback.

Eliyahu

I´m not sure aboute this, but can´t you use if(!Page.IsPostback) ?

/Marre

That's built-in behavior of Refresh button. It always repeats the last
postback. You can't change it. You can protect against it on server
side
if
you include something like a timestamp in the postback. Then you can
compare
the timestamp from the new postback with the one from the previous
postback.
If they match, you got Refresh click.

Eliyahu

Hi,

I'm working with datagrid. And users can add "Remarks" by clicking the
[Add]
link button in the footer template.

It's working fine like when the user enter the remarks and click on
[Add],
the remarks are getting added.

But if we refresh the page, a new record is getting added, which
should
not
happen

I do not have any unique columns (other than Remark Id) in the table sine
we
can add the remarks any number of times.

Any suggestion in this regards is highly appreciated.

srinivas

 

[Ric Bernat]

Check this out...

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnvs05/html/BedrockASPNET.asp