Modify Windows Forms Control from another Project

Question

I have a Control lblDate in User Control MainScreen. I would like to modify it in a method in class Date, which is in another project

Answer 1

I'd rather advise you make your GameDate method to return a string then call it from your main project which are essentially what libraries are meant for. e.g.:

public static string CalculateDate()
{
    return month.ToString() + "/" + displayDay.ToString() + "/" + year.ToString();
}

//in your main project
LabelDate.Text = myLibrary.CalculateDate();

For accessing it from other controls in the same project, you should use a delegate - Provide a delegate which performs the addition, declare the delegate and invoke the function from your CaculateDate. Example:

public delegate void dateSet(string);

public void setDate(string date)
{
    labelDate.Text = date;
}

then in your CaculateDate method:

labeldate.Invoke(new MainForm.dateSet(), GameDate);