Question

I have a combo box which gets data from a database and a list box which also gets data from a database.

Now what I’d like to do is change the value on the list box depending on the value of the combo box.

For example of if I select “apple” from a combo box, then in the list it should display the types of apples.

In this case let’s say the types of apples are Granny Smith, Red Delicious, and so on. I hope you guys get what I am trying to say. I have not started to code but I need a method that will allow me to get the desired output. And also I am new to asp.net with vb.

Answer 1

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
    ListBox1.Items.Clear()

    Dim com As New SqlClient.SqlCommand("SELECT type FROM Tbl WHERE category = '" & ComboBox1.Text & "'", sqlConn)
    Dim sql As SqlClient.SqlDataReader = com.ExecuteReader()

    While sql.Read
        ListBox1.Items.Add(sql.GetString(0))
    End While
    sql.Close()
End Sub