private void button1_Click(object sender, EventArgs e)
        {
            TextBox tbox = new TextBox();
            tbox.Text = "add";
            tbox.Location = new Point(30, 50);
            this.Controls.Add(tbox);
        }

------解决方案--------------------
        private void button1_Click(object sender, EventArgs e)
       {
           TextBox tb = new TextBox();
           tb.Height = 50;
           tb.Width = 100;
           tb.Location = new Point(100, 100);
           this.Controls.Add(tb);
       }

------解决方案--------------------
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C# code

        private void button1_Click(object sender, EventArgs e)
        {
            TextBox tbox = new TextBox();
            tbox.Text = "add";
            tbox.Location = new Point(3……