Autocomplete Textbox Very Slow in C# Winform

Hi Everyone,

In my project i m using autocomplete textbox. i m binding the Phone no from database in autocomplete textbox. I have more than 500 records in my table (phone no table). it loading very slow in my method. how can i increase performance for autocomplete. if any one know solution for this plz just reply me...

thanks & regards

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Thanks & Regards,