Excuse me, ladies and gentlemen, I want to open the software will be displayed after please select, comboBox1. SelectedIndex=0; Why do you wrong!

CodePudding user response:

No you don't have to, have to do is change the form, such as. The text="please select";

CodePudding user response:

To set up a dropdownlist to use?

CodePudding user response:

ComboBox1. SelectedIndex=0;

And use it every time you make sure you have the bound data source, and you please select the data source index 0

CodePudding user response:

refer to the second floor by_ love reply:

to set the dropdownlist to use?

is watching spot bamboo I came in this picture, it's a pity that CSDN into this ghost appearance, not what it once was

CodePudding user response:

The

refer to the original poster weixin_43669653 response:

Excuse me, ladies and gentlemen, I want to open the software will be displayed after please select, comboBox1. SelectedIndex=0; Why do you wrong!

Data binding, 0 index is not blank?

How this change revision so ugly, have no language

CodePudding user response:

It is written in the following way?

 
ComboBox1. SelectedIndex=0; 
ComboBox1. Items. The Add (" select "); 
ComboBox1. Items. The Add (" guangdong "); 
ComboBox1. Items. The Add (" shenzhen "); 
ComboBox1. Items. The Add (" hunan "); 

If it is should have the

 comboBox1. SelectedIndex=0; 

on adding options last line,

CodePudding user response:

Add item, and then set is selected, then the SelectedIndex=0, can also. SelectedItem="please select";

CodePudding user response:

CodePudding user response:

The

refer to the original poster weixin_43669653 response:

Excuse me, ladies and gentlemen, I want to open the software will be displayed after please select, comboBox1. SelectedIndex=0; Why do you wrong!

Do you want to put the comboBox1. SelectedIndex=0; Under the data binding,