Send keystroke to other control

c# forwarding keystroke
vIceBerg picture vIceBerg · Aug 12, 2009 · Viewed 23.8k times · Source

Easy one for you guys.

I have a textbox on top of a listbox.

The textbox is use to filter ther data in the listbox.

So... When the user type in the textbox, I would like to "trap" the down/up/pagedown/pageup keystrokes and fowarding them to the listbox.

I know I could use the Win32 API and send the WM_KeyDown message. But there's must be some .NET way to do this.

Answer

kv-prajapati picture kv-prajapati · Aug 12, 2009

SendKeys.Send() Method.

 private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            listBox1.Focus();
            SendKeys.Send(e.KeyChar.ToString());
        }

Here is code through which you can select a list item.

private void Form1_Load(object sender, EventArgs e)
        {
            textBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            textBox1.AutoCompleteSource=AutoCompleteSource.CustomSource;
            string[] ar = (string[])(listBox1.Items.Cast<string>()).ToArray<string>();
            textBox1.AutoCompleteCustomSource.AddRange(ar);
        }
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            listBox1.Text  = textBox1.Text;
        }

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