How will I get the saved history of textbox (text which is previously entered) in vb.net ?

u can use any available .Net data structure to store previous textbox values, like List, Queue, etc.
i'd create class like this:

    public class TextHistory
    {
        private List<string> history = new List<string>();
        public void Add(string text)
        {
            history.Add(text);
        }
        public IList<string> History
        {
            get { return history.AsReadOnly(); }
        }
    }

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