Monthly 10K Mandatory--c# dropdown box linkage

drop-down box linkage

Many sites use the dropdown box linkage, is the first drop-down box does not select any items, the second drop-down box has no options. This approach is more cautious and tighter.

Below I will teach you how to do the dropdown box linkage:

first assign the option to the first drop-down box in the form's Load event

And then the first drop-down box has an option.

We then write the code for the second drop-down box in the selectedindexchanged () event of the first drop-down box (that is, double-click the drop-down box)

This way, as long as the first drop-down box is not selected, the second drop-down box will not have a selection!

Pull-down box linkage is like this, hope that the reader a little bit help!

Monthly 10K Mandatory--c# dropdown box linkage