在C＃中显示隐藏标签

问题描述

好吧我正在做这个表格，当我从下拉菜单中选择一个特定的项目时它会改变它的样子，

Alright I'm doing this form that's supposed to change it's look when I choose a specific item from a drop down menu,

private void ChangeGUI(int option)
   {
       switch (option)
       {
           case 0:
           case 1:
               labelAntal.Visible = true;
               txtAntal.Visible = true;
               labelWeight.Visible = false;
               txtWeight.Visible = false;
               break;

           case 2:
               labelAntal.Visible = false;
               txtAntal.Visible = false;
               labelWeight.Visible = true;
               txtWeight.Visible = true;
               break;
       }

   }

我一直在txtWeight.Visible上得到nullReferenceException ，那就是我从下拉菜单中选择第3个选项。



谁能看到我在这里做错了什么？：（

I keep getting a nullReferenceException on txtWeight.Visible , that is when i choose the 3'rd option from the drop down menu.

Can anyone see what I'm doing wrong here?:(

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