c#

Open sitecore media library programmatically from asp.net button click

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I have been trying to figure out if it is possible to open the Sitecore media library browser programmatically from ASP.NET code-behind on a server-side button click. By searching the net, I found an example which explained how to open a media library browser from a Sitecore thumbnail click. I tried this approach on ASP.NET server-side button click but it did not work failing with object reference not set to an instance of an object.

How to use linkbutton in repeater using C# with ASP.NET 4.5

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In asp.net I have a table in database containing questions,date of submission and answers.On page load only questions appear.now i want to use any link which on clicking show answers and date specified in table data, either in textbox or label and clicking again on that link answer disappear again like expand and shrink on click.
So what coding should i use for this in C#?