工资管理系统需要哪些模块！个个模块有哪些内容！

public int sum()
{
int va=0;
SqlConnection conn=new SqlConnection("........");
conn.open();
select SqlCommand cmd = new SqlCommand("select sum(value)as sum_val from tablename where name='标准工资' or name='浮动工资' name='应发工资' name='浮动工资'", conn);
dr=cmd.ExecuteReader();
if (cmd.Read())
{
va=Convert.Int16(dr["sum_val "]);
}
cmd.Disponse();
conn.Close();
return va;
}