issue with setting focus not working

Question

I have a screen where the user enters in to a text box a name of a location. then click on a button to open a group box that has three textboxes Firstname, lastname and PW. I am trying to set the focus to the firstname text box when the user clicks the button to make the group box visible (on the main form). but it will not set the focus (txtbxnameFirst.focus();)

Answer 1

Requirement

I understood the following:

• user writes text into locationTextBox and clicks the button locationSaveButton

• after clicking the button a GroupBoxControl should be set to visible and the firstNameTextBox shall receive the focus

The code

The button that is clicked after entereing the location locationButton has a Click Event with this code

private void locationButton_Click(object sender, EventArgs e)
{
    // get value from textbox location
    string location = locationTextBox.Text;
    // make the groupBox visible
    groupBox1.Visible = true;
    // set the focus to the textbox for the firstname
    firstNameTextBox.Focus();           
}

Simple Demo with windows forms

This how the application looks before clicking the button

After clicking it the groubBox is set to visible and the other TextBoxes are visible and the focus is set to the firstNameTextBox