problem insert into access DB

Hi I'm trying to insert into access DB this data using this code is any one can explain what is wrong with this code ???? the code : --------------------------------------------------------------------------------------- OleDbConnection connection = new OleDbConnection(strDBConn); OleDbTransaction transaction; String sql = "INSERT INTO TblProjects (field1, field2, field3, field4, field5)" + " VALUES ('" + txtbx_ProjectName.Text + "','" + ddlst_SystemsType.SelectedItem.Text + "','" + ddlst_Versions.SelectedItem.Text + "','" + ddlst_Tester.SelectedItem.Text + "','" + ddlst_ProjectManager.SelectedItem.Text + "');"; connection.Open(); transaction = connection.BeginTransaction(); st = sql; OleDbCommand commmand = new OleDbCommand(sql, connection); commmand.CommandType = CommandType.Text; commmand.Transaction = transaction; commmand.ExecuteNonQuery(); transaction.Commit(); connection.Close(); Response.Redirect("aspPage.aspx"); --------------------------------------------------------------------------------------- the exception is : Operation must use an updateable query. --------------------------------------------------------------------------------------- the SQL is: INSERT INTO TblProjects (field1, field2, field3, field4, field5) VALUES ('aaa','bbb','ccc','ddd','eee');