i m using combo box in vb.net 2008 bt i m using the property as i can type in combobox this is done ... bt on running it ..when i m entering the wrong word in combo it will save the data .or sometimes gives error nd i want that it must stop writting or restrict the user to only rite that word that r already in the combo box list ....bt after this i have to handle tab nand enter

Let see your code, how you have done all that.

THAT IS THE FUNCTION....

Public Function ValidatecboKey(ByVal KeyChar As String, ByVal cbo As ComboBox) As Boolean

        KeyChar = Mid(cbo.Text, 1, cbo.Text.Length - cbo.SelectionLength) + KeyChar

        Dim Index As Integer = cbo.FindString(KeyChar)

        If Index < 0 Then
            Return True
        End If

        Return False

ND USING IT LIKE

Private Sub cboBankID_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles cboBankID.KeyPress
        If Asc(e.KeyChar) = 8 OrElse Asc(e.KeyChar) = 27 Then
            e.Handled = False
        Else
            e.Handled = Admin.ValidatecboKey(e.KeyChar.ToString, cboBankID)
        End If
    End Sub