C#写API函数

private void button1_Click(object sender, System.EventArgs e)
  {//写入Win.ini文件
   try
   {
    WriteProfileString("演示程序","软件名称",this.textBox1.Text);
    WriteProfileString("演示程序","著作权人",this.textBox2.Text);
    WriteProfileString("演示程序","版本号",this.textBox3.Text);
    MessageBox.Show("写入Win.ini文件操作成功！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
   }
   catch(Exception Err)
   {
    MessageBox.Show("写入Win.ini文件操作失败！"+Err.Message,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);//提示框写法
   }
  }

  private void button2_Click(object sender, System.EventArgs e)
  {//读取Win.ini文件
   StringBuilder MyString=new StringBuilder(256);
   GetProfileString("演示程序","软件名称","",MyString,256);
   this.textBox1.Text=MyString.ToString();
   GetProfileString("演示程序","著作权人","",MyString,256);
   this.textBox2.Text=MyString.ToString();
   GetProfileString("演示程序","版本号","",MyString,256);
   this.textBox3.Text=MyString.ToString();
  }