How to retain the value after getting redirected to a page asp.net with c#?

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How to retain the value after getting redirected to a page?
I am checking for an alert message for a duplicate combination server side. If such a value exists I need to show the same in a pop up window. If the checkbox is checked in the pop up window user must be able to save the data. Else the pop up must remain there.
I can't use client side option as there are other validations done in the server side on button click and duplicate checking also done there.

What I have tried:

I am passing the message as below to another page with checkbox to override the validation. If checked then data needs to be saved else pop up should remain there.

C#

strDuplicateDDAValidationError = "test";
                string qryString = "?DuplicateDDACombinationMessage=" + strDuplicateDDAValidationError;
                if (qryString != "")
                {
                    Page.RegisterStartupScript("View_OUT_300_DDA_Duplicate_Validation.aspx", "<script language=\"javascript\">var answer = window.showModalDialog(\"View_OUT_300_DDA_Duplicate_Validation.aspx" + qryString + "\",'',\"dialogWidth:1000px; dialogHeight:800px; center:yes\");</script>");
                    return;
                }

Posted 18-Feb-16 0:23am

ranio

Updated 18-Feb-16 4:20am

Herman<T>.Instance

v2

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Richard Deeming · Answer 1 · 2016-02-18T04:20:00

showModalDialog[^] is in the process of being dropped, and should not be used. It was removed from Chrome in v37 back in 2014, and Firefox will drop support in June this year.

You will need to change your code to use an alternative - for example:

Dialog | jQuery UI[^];
Modals · Bootstrap[^];

The modal dialog content will then be part of your main page. You should be able to add a <asp:CheckBox AutoPostBack="True"> to the content, which will trigger a post-back when the user checks the box.