I wrote this code and i can populate result of query to combobox1.but i want to use parameter in my query and i want to range next combobox(such as combobox2) in attention to the selected item in combobox1.My sample databese name is test1 and has 3 field:categoryID,ParentID and Title.Please Help me
here is my code

Dim DataAdapter As OleDbDataAdapter = New OleDbDataAdapter()
Dim myConn As OleDbConnection = New OleDbConnection
Dim sqlStr As String
'Dim conStr As String
Dim dviewmanager As DataViewManager
myConn.ConnectionString = "Provider=microsoft.jet.oledb.4.0;data source = C:\Documents and Settings\sce\Desktop\test1.mdb"
'myConn = New OleDbConnection(constr)
myConn.Open()
'TextBox1.Text = "wsaaAS"
sqlStr = "Select Title From Table1"
DataAdapter = New OleDbDataAdapter(sqlStr, myConn)
'Test1DataSet = New DataSet()
DataAdapter.TableMappings.Add("testmapping", "Table1")
DataAdapter.Fill(Test1DataSet)
dviewmanager = Test1DataSet.DefaultViewManager
ComboBox1.DataSource = dviewmanager
ComboBox1.DisplayMember = "Table1.Title"
myConn.Close()