图形绘画OnPaint()方法的问题

问题描述

为什么此代码与Button_Click(在表单上)正确执行，
但是当它与Form_load一起执行时却没有响应???

why this code with Button_Click(On Form) excecute correctly,
But when it with Form_load Excecuted it not response???

private void button1_Click(object sender, EventArgs e)
       {
           String drawString = "Sample Text";

           // Create font and brush.
           Font drawFont = new Font("Arial", 16);
           SolidBrush drawBrush = new SolidBrush(Color.Black);

           // Create point for upper-left corner of drawing.
           Point drawPoint = new Point(20, 20);

           // Draw string to screen.
           Graphics p= pictureBox1.CreateGraphics();

           Graphics k = this.CreateGraphics();
           p.DrawString(drawString, drawFont, drawBrush, drawPoint);


       }

-------------------------------------------------- ----------------------

------------------------------------------------------------------------

private Form_Load(object sender, EventArgs e)       //not response
       {
           String drawString = "Sample Text";

           // Create font and brush.
           Font drawFont = new Font("Arial", 16);
           SolidBrush drawBrush = new SolidBrush(Color.Black);

           // Create point for upper-left corner of drawing.
           Point drawPoint = new Point(20, 20);

           // Draw string to screen.
           Graphics p= pictureBox1.CreateGraphics();

           Graphics k = this.CreateGraphics();
           p.DrawString(drawString, drawFont, drawBrush, drawPoint);


       }

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