oledbexception must declare the scalar variable

I tried the following code connecting to an access database and it worked fine,  But I tried this code on SQL server 2005 and I get this error:

Error: System.Data.OleDb.OleDbException: Must declare the scalar variable "@f1".

Connection string to Access Database:

 "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\myDB.mdb;Persist Security Info=False;Jet OLEDB:Database Password=myPassword;"

Connection string to SQL server 2005:

"Provider=sqloledb;Data Source=192.168.0.129,1433;Initial Catalog=myDB;User Id=MyUser;Password=myPassword;"


Dim sql As String = "UPDATE Table1 SET f1=@f1,f2=@f2,f3=@f3 WHERE ID = 118"
                Dim conn As New OleDb.OleDbConnection(ConnectionString)
                Dim command As New OleDb.OleDbCommand(sql, conn)

                command.Parameters.Add("@f1", OleDb.OleDbType.Variant).Value = TextBox1.Text
                command.Parameters.Add("@f2", OleDb.OleDbType.Variant).Value = TextBox2.Text
                command.Parameters.Add("@f3", OleDb.OleDbType.Variant).Value = TextBox3.Text

                Try
                    conn.Open()

                    command.ExecuteNonQuery()
                Catch ex As Exception
                    MsgBox(ex.ToString)
                Finally
                    conn.Close()
                End Try