Control is not getting focused on Keyup event

Question

Hi all I have created a dynamic combo box with a Textbox and a button to appear as dropdown style, every thing works fine but I handled keyup event for the textbox so that when user enter some text I will search for the results and display them

 private void textBox1_KeyUp(object sender, KeyEventArgs e)
 {
     //Some code to filter my data 
     textBox1.Focus();
 }

But I am unable to set the focus Immediately back to the textbox after results getting displayed so can some one help me

Code I used is from here

http://www.planetsourcecode.com/vb/scripts/showcode.asp?txtCodeId=8554&lngWid=10

Answer 1

I have found that the Focus() method is a bit flaky.

Other options:

textBox1.Select(textBox1.Text.Length - button1, 1);

...or simply:

textBox1.Select();

If you can verify that something else is going wrong, then this might be off base, otherwise you might simply be fighting weirdness.