//login user with password decription public Boolean loginUser(string username, string password) { DBconnection dBconnection = new DBconnection(); dBconnection.sqlConnection.ConnectionString = dBconnection.dataString; dBconnection.sqlConnection.Open(); string login_user = "******" + username + "'"; dBconnection.sqlCommand.Connection = dBconnection.sqlConnection; SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(login_user, dBconnection.sqlConnection); DataTable dataTable = new DataTable(); sqlDataAdapter.Fill(dataTable); dBconnection.sqlConnection.Close(); foreach (DataRow row in dataTable.Rows) { string loginpassword = PasswordEncryption.decryptPassword(row["password"].ToString()); if (loginpassword.Equals(password)) { return(true); } else { return(false); } } return(false); }