c# 中如何封装一个方法？

我想封装一个方法简便一下代码，大概内容是鼠标移动到按钮会在Image中加上图片以，如果按钮是已经点击过的，鼠标移动过去不会发变改mIage状态。
private static bool picregisterFlag;
private static bool picuserAdministrationFlag;
private void pictureBox1_Click_1(object sender, EventArgs e)
{
（** this.tabControl1.SelectedIndex = 0;**

** picregisterFlag=true;**

• picuserAdministrationFlag = false;

** picregister.BackgroundImage = Resources.用户注册选中;**

•     picuserAdministration.BackgroundImage = Resources.用户管理;**）
  

  对这部分进行封装一个方法
  }
  private void pictureBox2_Click(object sender, EventArgs e)
  {
  this.tabControl1.SelectedIndex = 1;

      picregisterFlag = false;
      picuserAdministrationFlag = true;
  
      picregister.BackgroundImage = Resources.用户注册;
      picuserAdministration.BackgroundImage = Resources.用户管理选中;
  }
  
                  private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
  {
      if (picregisterFlag == true) { picregister.Image = null; }
      else { picregister.Image = Resources.导航鼠标经过; }
  }
  
                  private void pictureBox2_MouseMove(object sender, MouseEventArgs e)
  {
      if (picuserAdministrationFlag == true) { picuserAdministration.Image = null; }
      else { picuserAdministration.Image = Resources.导航鼠标经过; }
  }