Winforms AutoComplete TextBox using C#

In this example i am explaining how to create a AutoComplete TextBox In windows forms application using C# , the autocompletion data is fetched from databse or this i've created a database with a table containing names which will be shown in textbox as suggestions, for this we need to create a AutoCompleteStringCollection and then add the records in this collection using datareader to fetch records from database For autocomplete functionalty to work we need to define these 3 properties of textbox