Sample code to add search to a Dataset

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I have a repeater control connected to a dataset. The dataset is linked to a database. The database will have more than 1000 items. I would like the user to enter serach text on top of my page and limit the dataset to the filtered items. The filter will be on at least 3 fields in the database using the same search text. I believe I will have to add coding to achieve this.

Could you kindly point me to some sample code to achieve ?

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Where can I find the source code for this?