ComboBox / Related ComboBoxes exemple
all work perfectly but now i tri tu put in session the value off the 3 combobox
the 1 work perfectly but the other do this message :
System.NullReferenceException: La référence d'objet n'est pas définie à une instance d'un objet.
my code :
Protected Sub Loadvoiture()
Dim connection As SqlConnection = CreateConnection()
Dim adapter As New SqlDataAdapter("SELECT * FROM MAKE ORDER By Make", connection)
Dim dt As New DataTable()
adapter.Fill(dt)
RadComboBox1.DataTextField =
"Make"
RadComboBox1.DataValueField =
"Makecode"
RadComboBox1.DataSource = dt
RadComboBox1.DataBind()
'insert the first item
RadComboBox1.Items.Insert(0,
New RadComboBoxItem("- Slectionnez une marquent -"))
End Sub
Protected Sub LoadModele(ByVal MakecodeID As String)
Dim connection As SqlConnection = CreateConnection()
Dim adapter As New SqlDataAdapter("SELECT * FROM MODEL WHERE Makecode=@Makecode ORDER By Model asc", connection)
adapter.SelectCommand.Parameters.AddWithValue(
"@Makecode", MakecodeID)
Dim dt As New DataTable()
adapter.Fill(dt)
For Each row As DataRow In dt.Rows
Dim item As New RadComboBoxItem()
tem.Text = row(
"Model").ToString() & " ( " & row("Model_Year_From").ToString() & " - " & row("Model_Year_Till").ToString() & " ) "
item.Value = row(
"ModelCode").ToString()
RadComboBox2.Items.Add(item)
Next
End Sub
Protected Sub LoadType(ByVal ModelCodeID As String)
Dim connection As SqlConnection = CreateConnection()
Dim adapter As New SqlDataAdapter("SELECT * FROM TYPE WHERE ModelCode=@ModelCode ORDER By ModelCode", connection)
adapter.SelectCommand.Parameters.AddWithValue(
"@Modelcode", ModelCodeID)
Dim dt As New DataTable()
adapter.Fill(dt)
RadComboBox3.DataTextField =
"Type"
RadComboBox3.DataValueField =
"TypeCode"
RadComboBox3.DataSource = dt
RadComboBox3.DataBind()
End Sub
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
'------------------------after this WORK
Session(
"marque") = RadComboBox1.SelectedItem.Text
Session(
"marqueID") = RadComboBox1.SelectedItem.Value
'------------------------after this NOT WORK
Session(
"modelev") = RadComboBox2.SelectedItem.Text
Session(
"modelevID") = RadComboBox2.SelectedItem.Value
Session(
"typev") = RadComboBox3.SelectedItem.Text
Session(
"typevID") = RadComboBox3.SelectedItem.Value
End Sub
this code not work impossible to put the selected value of RadComboBox2 and RadComboBox3 in session
why ? the first RadComboBox1 session work perfectly !
Thanks for you help
3 Answers, 1 is accepted
Rank 2
I don t found any soluce on my problem
with this exemples :
http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/multiplecomboboxes/defaultcs.aspx
when all radcombobox a selected
how to access to the value off radcombobox2 and radcombobox3 in codebehind
I need this to transfert this value to an other page
thanks
Please use SelectedValue and Text properties of the combobox in order to get the value and text of the loaded on demand items.
Best wishes,
Yana
the Telerik team
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Rank 2