Question

I am trying to use AutoComplete feature of textboxes in my winforms application.

The textbox is used to send some GPIB/SCPI commands to an instrument. So before I get the idea of autocomplete it was working fine, but with autocomplete, the KeyPress event is no more working.

The code I wrote is this:

//AutoComplete collection
AutoCompleteStringCollection _commandHistory = new AutoCompleteStringCollection();

public Form1() //Constructor
{
    InitializeComponent();

    _commandHistory.AddRange(new string[3]{"*IDN?", "*RST", ":READ?"});
    tbCommandLine.AutoCompleteSource = AutoCompleteSource.CustomSource;
    tbCommandLine.AutoCompleteCustomSource = _commandHistory;
    tbCommandLine.AutoCompleteMode = AutoCompleteMode.Append;
}

And here is what I defined for the KeyPress event

private void tbCommandLine_KeyPress(object sender, KeyPressEventArgs e)
{
    if (e.KeyChar == (char)Keys.Return)
    {
        SendCommand(tbCommandLine.Text.Trim()); //Send Command
        _commandHistory.Add(tbCommandLine.Text.Trim()); //Store command in autocomple source
        tbCommandLine.Text = String.Empty; //clear textbox
    }
}

After I added the AutoComplete, if I press enter or type something that is in the source of autocomple, the text in the textbox will get hihglighted and the enter key will not do anything.

Answer 1

Solved by changing KeyPress to KeyDown