Question

I have inherited the new save close buttons from base form to all the forms. I write the code in the base form to clear all the controls when new button clicked.

foreach (Control ctrl in cc)
{
    if (ctrl.GetType() == typeof(TextBox))
        ctrl.Text = "";

    else if (ctrl.GetType() == typeof(ComboBox))
    {
        ComboBox cb = ctrl as ComboBox;
        cb.SelectedIndex = -1;
        cb.Text = "";
    }
}

This code will clear all the TextBoxes and ComboBoxes. Now I want to focus the first TextBox after clicking the new button. Code must write in base form to focus first control in all the inherited forms.

Answer 1

You may get the first TextBox from the Control Collection on the base form using LINQ FirstOrDefault. Later you can call its Focus method.

TextBox firstTextBox = this.Controls.OfType<TextBox>().FirstOrDefault();
if(firstTextBox != null)
    firstTextBox.Focus();