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public partial class Form1 : Form
    {
        private void button1_Click(object sender, EventArgs e)
        {
            Form2 frm2 = new Form2();
            frm2.Show(this);
        }
    }

    public partial class Form2 : Form
    {
        private void button1_Click(object sender, EventArgs e)
        {
            Form1 frm1 = (Form1)this.Owner;
           
        }
    }

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C# code:

Form2 frm2 = new Form2();
private void button1_Click(object sender, EventArgs e)
{
frm2.BackColor = Color.Red;
}


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button1 ÊÇÔÚform1ÀïÃæ

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ÎÒÊÇÔÚ form1 ÀïÃæ show form2
button