Variable value not being updated in updatepanel

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I have an update panel where I have a dropdown set to autopostback true.
Depending on the selection in the dropdown, a variable value is updated which is used in a link to populate a query string value.

But if I use the update panel, the variable value is not being updated, keeping the old value that it gets during load.

How can I achieve this?
Thanks.

Posted 14-Jan-11 11:18am

Ekjon

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[no name] 14-Jan-11 19:17pm

What variable? is it JavaScript or in the code behind?

AspDotNetDev 14-Jan-11 21:02pm

How is the query string value populated? Any change in the query string should cause a page refresh? You'd either do it using a Response.Redirect (ASP.Net) or a window.location = ... (javascript). Post some code.

4 solutions

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thatraja · Answer 1 · 2011-01-14T15:18:00

Solution 1

Try this

ASP.NET AJAX:dropdownlist inside a update panel is not updating[^]

BTW why don't you include your code in your question for quick response?
Let us know.

Posted 14-Jan-11 15:18pm

thatraja

Sandeep Mewara · Answer 2 · 2011-01-14T20:34:00

Solution 2

Put a hidden field in UpdatePanel. On dropdown value change, update the hidden field(server control) with the desired value.

Now, use this hidden field value to populate query string. Done!

Posted 14-Jan-11 20:34pm

Sandeep Mewara

Comments

Ekjon 17-Jan-11 14:24pm

I tried all these before. But I had some other complexities - like the whole page is built dynamically based on some data - so I had to force a reload and use a querystring. Otherwise wasn't working no matter what I did. Thanks to all of you for your time and help.

TusharKothawade · Answer 3 · 2011-01-14T23:29:00

Hi,
If your declare the variable in class level.
eg.

public partial class _Default : System.Web.UI.Page
{
public int Count = 0;

protected void button1_Click(object sender, EventArgs e)
{
count = 5;
}

protected void button2_Click(object sender, EventArgs e)
{
response.write(count);
}

}

output is : 0

So dclare the variable as static.

public partial class _Default : System.Web.UI.Page
{
public static int Count = 0;

protected void button1_Click(object sender, EventArgs e)
{
count = 5;
}

protected void button2_Click(object sender, EventArgs e)
{
response.write(count);
}

}

output is : 5

i think it solve ur problem.

Anupama Roy · Answer 4 · 2011-01-15T20:15:00

Solution 4

After you set the variable,Call Update of updatepanel inorder to refresh

C#

UpdatePanel1.Update();

Posted 15-Jan-11 20:15pm

Anupama Roy