ASP Custom Server Control data flow

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I have to build a custom control where I will render a textbox where I am supposed to take input, and on textbox change event I will have to keep a list of objects that satisfy that search string I took from the input, which should be exposed to be fetched at any time. I have no idea how to make an asynchronous call to the code behind the control. I am very new to custom controls, recently I have developed only one that rendered some div. I am very confused about this one, can any one give me any idea of how to do this? I am not asking for the code, I can figure it on my own, but I am missing the idea or general knowledge about asp custom controls.

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