How to populate a combobox on the selection of another combo

Question

Dear  Programmers . How to populate a combobox on the selection of another combobox. In asp.net For example • In combobox1 values “Cars” in combobox2 will be “BMWToyotaNissan etc” • In combobox1 values “Fruits” in combobox2 will be “MangoappleBanana etc” But it should be from database

Riddhi Valecha · Answer

Hi... On Page_Load event populate the combobox-1 using Datatable. i.e. Get data from back-end in DataTable. ComboBox1.DataSource = DataTable; ------ On SelectIndexChanged event on combobox one populate the other combo box.

Hussain Afridi · Answer

Dear Sir i need this type of article

Ch.Smrutiranjan Parida · Answer

Yes. Riddhi is correct. But to ad that you can fetch all the data I mean for both the drop down at the time of page load and store it. And as she said on selection change of dropdown1 you can databound dropdown2 putting condition. This will save your time and you don't need to fetch the data again from DB for dropdown2.