Autocomplete TextBox in Asp Net c# With SQL

In this tutorial I am going to show you, how to add autocomplete extender to a textbox to display as dropdown in asp.net c# with SQL.
Usually we need to insert a new record which is not available from the beginning. We should check the data exist or not in the list when put the record in textbox. In that case
Autocomplete extender is very much essential to develop a web application in asp.net c#.

Follow these steps-
1. Add a textBox in asp.net form.
2. Add Ajax Toolkit .dll file in ToolBox.
3. Add autocomplete extender from the toolbox to asp.net page.
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