Creating an auto-complete box C#

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Create a Standard C# Form and add a combo box.

The following method initializes the combo box with the auto-complete functionality.

public void init_box()

{

AutoCompleteStringCollection ax = new AutoCompleteStringCollection();

if (File.Exists("List.txt"))

{

using (StreamReader reader = new StreamReader("List.txt"))

{

string line;

while ((line = reader.ReadLine()) != null)

{

ax.Add(line);

}

}

}

comboBox1.AutoCompleteCustomSource = ax;

comboBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;

comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

}

next, this method is called on the mouse click event of the combo box.

private void comboBox1_MouseClick(object sender, MouseEventArgs e)

{

init_box();

}