ADO.NET :: Date Not Save In Oracle Databse?

here is my function

Public Shared Function GetData(ByVal strQuery As String) As DataTable
Dim dt As New DataTable
Dim cmd As New OracleCommand(strQuery, conn)
cmd.CommandType = CommandType.Text
Try
conn.Open()
da.SelectCommand = cmd

[Code]....

here im calling above GetData function

[Code]....

it is not accepting date i was try to use CDate(BDPLite2.SelectedDate) also but not working but when i use store procedure then this cdate method work but when i use inline code then no work....plz let me know where im doing mistake.