我们如何在使用C＃选择combobox1中的下一个项目时清除combobx2中的数据 [英] How can we clear data in combobx2 on selecting next item in combobox1 using C#

问题描述

hi,

I used two combo boxes cmbhospitals and cmbusers in cmbusers when i click hospital A in 1st combbox it displays users of that hospital but again when i click on hospital B in cmbusers(Combobox2) it was displaying both users og hospital A and B I used if which clears the text but not the previous hosptal data please suggest

我尝试过：

What I have tried:

//cmbhusers.SelectedItem=null;
                  	   cmbhusers.Items.Clear();
                  	   cmbhusers.ResetText();
cmbhusers.selectedIndex=-1;

推荐答案

在您的点击事件中，您需要在添加之前清除组合框2它的新项目。花一些时间研究 ComboBox类（System.Windows。表格） [ ^ ]，因为这似乎是给你带来最多麻烦的课程。

In your click event you need to clear combo box 2 before you add the new items to it. Spend some time studying ComboBox Class (System.Windows.Forms)[^], as this seems to be the class that is giving you most trouble.

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