Persisting user control values afer postback in asp.net

Question

I have a few user controls which I add to the aspx form depending on the user's choice from a combo box. I have a user control which has a textbox in it and a getValue() method that returns the value of the textbox.

After user selects the related item I load the control and add to a panel using loadControl method. User enters some text. After a postback I want to keep the user control and the user input in the same state before .

Hope this is clear.

Mitchel Sellers · Accepted Answer · 2010-12-30 14:56:23Z

3

There is going to be a two step process.

Ensure that you are adding the control to the page on the Page_Init method
You can then use ViewState (ViewState["MyKey"] = "My Value";) to store and retrieve the values.

The key here being that you MUST add the control in Init so that viewstate can be loaded.

answered Dec 30, 2010 at 14:56

Mitchel Sellers

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1 Comment

XtremeBytes Over a year ago

Right on spot, one thing to add though, if you dynamically add the control in page_init method and enable viewstate for the controls, it should take care of your needs. No need to store the value explicitly in State bag.

Tahbaza · Accepted Answer · 2010-12-30 14:54:19Z

2

You can add whatever you like to the page state using ViewState.

ViewState["myvalue"] = "?";

In this way you can inspect previous values on future postbacks like so:

someVariable = ViewState["myvalue"];

Even better, you can encapsulate this in a property on your page.

answered Dec 30, 2010 at 14:54

Tahbaza

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