The main object of this article is to access value of  asp.net controls which are generated dynamically. For this, we will save viewstate of dynamic controls.
Suppose we have one dropdown and one button. When user selects “Generate” option, the Dynamic table will be generated. In each cell of table there will be textbox. User enters value in the textboxes and click on button then it will display all user entered values.

In aspx page:

To create dynamic control:

Right Now, No output because dynamic controls are lost in postback .So we need to save dynamic controls value and generate dynamic controls again.we need to maintain viewstate.

Recently a new requirement came for cancel an async operation.  Being aware of the abortPostBack method the PageRequestManager, I figured that it would be pretty simple to implement this feature.  I added a ‘Cancel’ button to my progress indicator and wired the onclick handler to invoke the abortPostBack method.

Clicking cancel did abort the async postback however, because the OnUpdated animation only runs when the UpdatePanel is updated my indicator was never being hidden and it was appearing as if the application was hanging.   My approach to solving this was to look-up the animation component and invoke the animation myself.  like this:

 function abort(){

        var prm = Sys.WebForms.PageRequestManager.getInstance();
        if(prm get_isInAsyncPostBack()){
            //  abort the postback
            prm abortPostBack();
            //  get the reference to the animation for the gridview
            var animation = $find('animation');
            //  simulate stopping by replaying the animation
            animation._postBackPending = false;
            animation.get_OnUpdatingBehavior().quit();
            animation.get_OnUpdatedBehavior().play();
        }
    }

SOURCE

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Master Page Image Display Problem and Solution in Asp.net

Master Page is creating problem when a page inside folder is trying to refer master page. The reason of problem is Master Page is using absolute image url, which changes when you try to refer same inside folder.

A simple solution to problem is to define relative path for images inside master page.

So if you have coded like following in your MasterPage File

<img src=”Images/Logo.gif”/>
Than Replace it with,

<img src=”<%= Page.ResolveUrl(“~“)%>Images/Logo.gif”/>

 

Also you can solved this problem by doing this:

<img src=”~/images/logo.gif” runat=”server” />