About the dropdownlist control in Asp.net, after it is selected, it is restored to the default value after the page is sent back.

About the dropdownlist control in Asp.net, after it is selected, it is restored to the default value after the page is sent back.

 

There are two types of problems.

 

1. In the form loading, We do not judge the return. We only need to add

 

If (! Ispostback) {bind dropdownlist}

 

2. The text and value of dropdownlist are bound. I bind the same value

 

Value (After loading the page, you can check the HTML source code to see if the value has the same data.),

 

Each time we select dropdownlist, the default value will be restored once it is returned.

 

The value in dropdownlist is equivalent to a primary key.