Passing variables from main form to input form

Question

I have a simple question. I have a main form, and then a startup form from where I can select a new 3D model to generate. When selecting a new 3D model from the startup form

Answer 1

Here's my suggestion: place a 3DModel object property in your main form:

private Model _model;

Declare your startup form as a Dialog ( like OpenFileDialog) and do something like this:

public void OpenModel()
{
    using(var frm=new StartUpForm())
    {
        if(frm.ShowDialog()==DialogResult.OK))
        {
            if(_model.IsDirty)
            {
                if(MessageBox.Show("Model is changed do you want to save it?","",MessageBoxButtons.YesNo)==DialogResult.Yes)
                    _model.Save();

                _model=frm.SelectedModel;
            }
        }
    }
}

your startup form should have a interface like this:

public interface IStartupForm:IDisposable
{
    DialogResult ShowDialog(IWin32Window parent);
    Model SelectedModel{get;}
}