How to not loose the parameter when instancing new form

Question

I have my Code like this:

    private void button3_Click(object sender, EventArgs e)
    {
        schema s1 = new schema(readedImage);
        s1.ShowDialog();
        if(s1.imgToReturn != null)
        {
            readedImage = s1.imgToReturn;
            s1.imgToReturn = null;
        }
        s1.Dispose();
    }

Because I am creating a new instance, i dont get the "readedImage" in the new form when calling the .ShowDialog() later. Is there a way to give the parameters in the .ShowDialog Action?

edit: this is the constructor of the shema form:

    public schema(Image readedImage = null)
    {
        InitializeComponent();
        imgToReturn = readedImage;
    }

Greetings and thanks for help

Answer 1

I am not too sure what you mean in the question.

But I think this might help you

private void button3_Click(object sender, EventArgs e)
{
    schema s1 = new schema(readedImage);
    if(s1.ShowDialog() == DialogResult.OK)
    {
        if(s1.imgToReturn != null)
        {
            readedImage = s1.imgToReturn;
            s1.imgToReturn = null;
        }
        s1.Dispose();
    }
}

And in the dialog you are showing make sure to set the property DialogResult once the user is done and everything has worked out.