Question

I want to know if the control that got the focus is input control or not using c#

for example

this text box that I am writing the question in it now is input control but the preview text box down there is not because I cant write on it

I need to detect whether or not it is input control and I want to overwrite what being written there also

Answer 1

You want to edit the text people put in your input fields? Add event listeners on the input controls to the text changed event, and run a method that edits the text in the field.

    public Form1()
    {
        InitializeComponent();
        TextBox textBox = new TextBox();
        textBox.TextChanged += CheckInputText;
    }

    public void CheckInputText(object sender, EventArgs e)
    {
        // Modify text in the input control.
    }