KeyUp event on form wont run? c#

I wonder why this code never runs when I release a key.

    private void Form1_KeyUp(object sender, KeyEventArgs e)
    {
        MessageBox.Show("It works!");
    }

In designer this code is added as usual:

this.KeyUp += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyUp);

However events like Form load works perfect. Is there any common solutions for this 开发者_开发知识库problem?

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You should set the KeyPreview property of the form to true, this should work with your code.

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If the form has other controls on it try setting the Form.KeyPreview property to true: Key Preview on MSDN

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You have to be sure that there aren't any active control on the current form. Put this code in Form.cs

 this.ActiveControl = null;