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Old August 29th, 2012, 05:26 AM
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by the way, our country has more than 75 provinces so i handcoded and copy-pasted them one by one.
Really? Wow! What a nightmare that must be if you ever want to change something.

What about this:

Dim ProvinceMunicipalities = From city In myEntities.CityTbls
                                        Where city.Province = Province_Ddl.SelectedValue 
                                        Order By city.City
                                        Select city.City

                cityGridView.DataSource = ProvinceMunicipalities
Not it works for all 75 of them, regardless of what you choose in the DDL.

To make this even easier, set up the data source for the GridView to use the SelectedValue of the DropDownList. This way, you can accomplsih the exact same thing without manual coding and just a few server controls.

You find an example that demonstrates exactly this (using Genres and Reviews) on page 446 and further in the section "Filtering Data".


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rmanapul (August 29th, 2012)