public List<StudentResult> GetStudentAllResult(StudentResult aStudentResult)
{
try
{
connection.Open();
List<StudentResult> aStudentResults = new List<StudentResult>();
string query = "SELECT * FROM t_Result WHERE RegistationNo=@regNo";
command.CommandText = query;
command.Parameters.Clear();
command.Parameters.AddWithValue("@regNo", aStudentResult.RegistationNo);
SqlDataReader ResultReader = command.ExecuteReader();
while (ResultReader.Read())
{
StudentResult studentResult = new StudentResult();
studentResult.RegistationNo = ResultReader[0].ToString();
studentResult.DepartmentId = Convert.ToInt16(ResultReader[1].ToString());
studentResult.CourseId = Convert.ToInt16(ResultReader[2].ToString());
studentResult.GradeLetter = ResultReader[3].ToString();
studentResult.Status = Convert.ToInt16(ResultReader[4].ToString());
aStudentResults.Add(studentResult);
}
return aStudentResults;
}
finally
{
connection.Close();
}
}
private bool DoesThisSubjectExist(StudentResult aStudentResult)
{
List<Course> courses = new List<Course>();
aStudentManager = new StudentManager();
courses = aStudentManager.GetStudentCourses(aStudentResult.RegistationNo);
foreach (Course course in courses)
{
if (course.CourseId == aStudentResult.CourseId)
{
return true;
}
}
return false;
}
public string SaveASubjectGrade(StudentResult aStudentResult)
{
aResultGateway = new ResultGateway();
if (DoesThisSubjectExist(aStudentResult))
if (DoesThisSubjectResultExist(aStudentResult))
{
if (aStudentResult.GradeLetter == "F")
aStudentResult.Status = 1;
else
aStudentResult.Status = 0;
return aResultGateway.SaveASubjectGrade(aStudentResult);
}
else
return "You already completed this subject";
else
return "You Does not Get this Subject";
}
protected void saveButton_Click(object sender, EventArgs e)
{
try
{
StudentResult aStudentResult = new StudentResult();
aStudentResult.DepartmentId = Convert.ToInt16(departmentDropDownList.Text);
aStudentResult.CourseId = Convert.ToInt16(courseDropDownList.Text);
aStudentResult.RegistationNo = regNoTextBox.Value;
aStudentResult.GradeLetter = gradeLetterDropDownList.SelectedItem.Text;
ResultManager aResultManager = new ResultManager();
string msg = aResultManager.SaveASubjectGrade(aStudentResult);
if (msg == "Saved")
{
msgLabel.ForeColor = Color.Green;
msgLabel.Text = msg;
}
else
{
msgLabel.ForeColor = Color.Red;
msgLabel.Text = msg;
}
}
catch (SqlException sqlException)
{
msgLabel.ForeColor = Color.Red;
msgLabel.Text = "Database error.See details error: " + sqlException.Message;
}
catch (Exception exception)
{
msgLabel.ForeColor = Color.Red;
string errorMessage = "Unknow error occured.";
errorMessage += exception.Message;
if (exception.InnerException != null)
{
errorMessage += exception.InnerException.Message;
}
msgLabel.Text = errorMessage;
}
}
public bool DeletePreviousReselt(StudentResult aStudentResult)
{
try
{
connection.Open();
string query = "delete from t_Result Where RegistationNo=@regNo And CourseId=@CourseId";
command.CommandText = query;
command.Parameters.Clear();
command.Parameters.AddWithValue("@regNo", aStudentResult.RegistationNo);
command.Parameters.AddWithValue("@CourseId", aStudentResult.CourseId);
command.ExecuteNonQuery();
return true;
}
finally
{
connection.Close();
}
}
private bool DoesThisSubjectResultExist(StudentResult aStudentResult)
{
List<StudentResult> studentResults = new List<StudentResult>();
aResultGateway = new ResultGateway();
studentResults = aResultGateway.GetSubjectResult(aStudentResult);
if (studentResults.Count == 0)
return true;
foreach (StudentResult studentResult in studentResults)
{
if (studentResult.CourseId == aStudentResult.CourseId && studentResult.Status == 1)
{
aResultGateway = new ResultGateway();
if (aResultGateway.DeletePreviousReselt(aStudentResult))
return true;
}
}
return false;
}
public string SaveASubjectGrade(StudentResult aStudentResult)
{
try
{
connection.Open();
string query = "INSERT INTO t_Result VALUES(@regNo,@deptId,@courseId,@gradeLetter,@status)";
command.CommandText = query;
command.Parameters.Clear();
command.Parameters.AddWithValue("@regNo", aStudentResult.RegistationNo);
command.Parameters.AddWithValue("@deptId", aStudentResult.DepartmentId);
command.Parameters.AddWithValue("@courseId", aStudentResult.CourseId);
command.Parameters.AddWithValue("@gradeLetter", aStudentResult.GradeLetter);
command.Parameters.AddWithValue("@status", aStudentResult.Status);
command.ExecuteNonQuery();
return "Saved";
}
finally
{
connection.Close();
}
}
