In the correction I want to run a function/method in Form1 by button click in Form2, so I think it will work well. Form1: internal void VisibleFalse() { textBox1.Visible = true; } Form2: private void button1_Click(object sender, EventArgs e) { Form1 frm22 = new Form1(); frm22.VisibleFalse(); }
var
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