Are you sure you have references to the correct form when using Close()? Remember, it's not by the class name. So, if you had a Form1 object open, you cannot close it with the code Form1 form1 = new Form1(); form1.Close(); because that creates a new one.

If you're going to close a form from another, you need the form that's calling the close method to hold reference: Consider either passing the form as a parameter to the new one, or possibly having a static collection of all forms that you can access from anywhere.

do you get any errors when using this.Close()? Did you try with this.Hide()?

Call the Focus method on another control.
http://msdn.microsof...trol.focus.aspx

Well, have you written any code for this? If so, do post it here...and show us where in the code are you facing a problem and what steps you have taken to solve that problem.

regards,
Raghav

What is test1?

The example described was to control a datetimepicker

something like:

       private void btnIncHrs_Click(object sender, EventArgs e)
        {
            dateTimePicker1.Value = dateTimePicker1.Value.AddHours(1);
        
        }