how to insert empty value in access db in vb.net

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VB

MS-Access

Hai All
how to insert empty vlaue in access db.the following is used for get data from anther database and store in dt,form dt i will insert into new db,so i cant tell both coloumn have value,one time Department have and deptid not have value.in this time i need to insert department value and deptid as empty value

For Each row As DataRow In dt.Rows
                        Dim con2 As OleDbConnection = New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\admin\Desktop\Clean OCR DB\KM.mdb;Persist Security Info=False;Jet OLEDB:Database Password= Pa$$w0rd!238;")
                        Dim cmd As OleDbCommand = New OleDbCommand("insert into Department([Department],[DeptID]) values(" + dt.Rows(0)("Department").ToString + "," + dt.Rows(0)("DeptID").ToString + ")", con2)
                        con2.Open()
                        cmd.ExecuteNonQuery()
                        con2.Close()
                        cmd.Dispose()
                    Next

pls reply me asap

Regards
Aravind