/// <summary>
/// This is the cell click event of the grid view.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void gridStudentInformation_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
var element = gridStudentInformation.Columns["Delete"].Index;
if (e.ColumnIndex == element)
{
int ID;
ID = Convert.ToInt32(gridStudentInformation.Rows[e.RowIndex].Cells[0].Value);
string cmd;
SqlCommand command;
SqlDataReader reader;
cmd = "Delete from StudentAttendance where StudentId = @id";
command = new SqlCommand(cmd, conn);
command.Parameters.Add(new SqlParameter("@id", ID));
conn.Open();
command.ExecuteReader();
conn.Close();
cmd = "DELETE FROM StudentResult WHERE StudentId = @id1";
command = new SqlCommand(cmd, conn);
command.Parameters.Add(new SqlParameter("@id1", ID));
conn.Open();
command.ExecuteReader();
conn.Close();
cmd = String.Format("DELETE FROM Student WHERE Id = @ID");
command = new SqlCommand(cmd, conn);
command.Parameters.Add(new SqlParameter("@ID", ID));
conn.Open();
reader = command.ExecuteReader();
conn.Close();
conn.Open();
cmd = String.Format("SELECT *FROM Student");
reader = command.ExecuteReader();
SqlDataAdapter adapter = new SqlDataAdapter(cmd, conn);
DataTable table = new DataTable();
adapter.Fill(table);
gridStudentInformation.DataSource = table;
TabViewStudent.Refresh();
conn.Close();
}
else
{
var item = gridStudentInformation.Rows[e.RowIndex].Cells[0].Value;
//int IdOfItem;
//var SecondItem = gridStudentInformation.Rows[e.RowIndex].Cells[6].Value;
string cmd = String.Format("SELECT * FROM Student WHERE Id = @item");
SqlCommand command = new SqlCommand(cmd, conn);
command.Parameters.Add(new SqlParameter("@item", item));
conn.Open();
SqlDataReader reader = command.ExecuteReader();
Student s = new Student();
//tabControl1.SelectedTab = tabControl1.TabPages["View Student"].Show;
TabADDStudent.Show();
btnAddStudent.Text = "Update Student";
while (reader.Read())
{
lblID.Text = Convert.ToString(reader[0]);
txtFirstName.Text = Convert.ToString(reader[1]);
txtLastName.Text = Convert.ToString(reader[2]);
txtContact.Text = Convert.ToString(reader[3]);
txtEmail.Text = Convert.ToString(reader[4]);
txtRegistrationNumber.Text = Convert.ToString(reader[5]);
cmbStatus.Text = Convert.ToString(reader[6]);
}
conn.Close();
}
}
/// <summary>
/// This is the click event of Button of add student
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnAddStudent_Click(object sender, EventArgs e)
{
if (btnAddStudent.Text == "Update Student")
{
String FirstName, LastName, Contact, Email, RegistrationNumber;
int Status;
string ID = lblID.Text;
if (IsValidString(txtFirstName.Text))
{
if (IsValidString(txtLastName.Text) || txtLastName.Text.Length == 0)
{
if (isValidContact(txtContact.Text) || txtContact.Text.Length == 0)
{
if (isDigit(cmbStatus.Text) && isDigit(cmbStatus.Text))
{
if (IsValidEmail(txtEmail.Text) && isValidRegistrationNumber(txtRegistrationNumber.Text))
{
FirstName = txtFirstName.Text;
LastName = txtLastName.Text;
Contact = txtContact.Text;
Email = txtEmail.Text;
RegistrationNumber = txtRegistrationNumber.Text;
Status = Convert.ToInt32(cmbStatus.Text);
conn.Open();
string cmd = String.Format("UPDATE Student SET FirstName = @FirstName, LastName = @LastName, Contact = @Contact, Email = @Email, RegistrationNumber = @RegistrationNumber, Status = @Status WHERE Id = @ID");
SqlCommand command = new SqlCommand(cmd, conn);
command.Parameters.Add(new SqlParameter("@FirstName", FirstName));
command.Parameters.Add(new SqlParameter("@LastName", LastName));
command.Parameters.Add(new SqlParameter("@Contact", Contact));
command.Parameters.Add(new SqlParameter("@Email", Email));
command.Parameters.Add(new SqlParameter("@RegistrationNumber", RegistrationNumber));
command.Parameters.Add(new SqlParameter("@Status", Status));
command.Parameters.Add(new SqlParameter("@Id", ID));
SqlDataReader reader = command.ExecuteReader();
btnAddStudent.Text = "Add Student";
SqlDataAdapter adapter = new SqlDataAdapter(cmd, conn);
txtContact.Text = "";
txtEmail.Text = "";
txtFirstName.Text = "";
txtLastName.Text = "";
txtRegistrationNumber.Text = "";
cmbStatus.Text = "";
conn.Close();
TabADDStudent.Hide();
TabViewStudent.Show();
conn.Open();
cmd = String.Format("SELECT *FROM Student");
command = new SqlCommand(cmd, conn);
reader = command.ExecuteReader();
adapter = new SqlDataAdapter(cmd, conn);
DataTable table = new DataTable();
adapter.Fill(table);
gridStudentInformation.DataSource = table;
TabViewStudent.Refresh();
conn.Close();
}
}
}
}
}
}
else
{
lblID.Hide();
String FirstName, LastName, Contact, Email, RegistrationNumber;
int Status;
if (IsValidString(txtFirstName.Text))
{
if (IsValidString(txtLastName.Text) || txtLastName.Text.Length == 0)
{
if (isValidContact(txtContact.Text) || txtContact.Text.Length == 0)
{
if (isDigit(cmbStatus.Text) && isDigit(cmbStatus.Text))
{
if (IsValidEmail(txtEmail.Text) && isValidRegistrationNumber(txtRegistrationNumber.Text))
{
ClassStudent student = new ClassStudent();
student.FirstName = txtFirstName.Text;
student.LastName = txtLastName.Text;
student.Contact = txtContact.Text;
student.Email = txtEmail.Text;
student.RegistrationNumber = txtRegistrationNumber.Text;
student.Status = Convert.ToInt32(cmbStatus.Text);
FirstName = txtFirstName.Text = student.FirstName;
LastName = txtLastName.Text = student.LastName;
Contact = txtContact.Text = student.Contact;
Email = txtEmail.Text = student.Email;
RegistrationNumber = txtRegistrationNumber.Text = student.RegistrationNumber;
Status = Convert.ToInt32(cmbStatus.Text);
conn.Open();
String cmd = String.Format("INSERT INTO Student(FirstName, LastName,Contact, Email, RegistrationNumber, Status) values('{0}','{1}','{2}','{3}','{4}','{5}')", FirstName, LastName, Contact, Email, RegistrationNumber, Status);
SqlCommand command = new SqlCommand(cmd, conn);
command.Parameters.Add(new SqlParameter("0", 1));
SqlDataReader reader = command.ExecuteReader();
SqlDataAdapter adapter = new SqlDataAdapter(cmd, conn);
MessageBox.Show("Student has been added");
txtContact.Text = "";
txtEmail.Text = "";
txtFirstName.Text = "";
txtLastName.Text = "";
txtRegistrationNumber.Text = "";
cmbStatus.Text = "";
conn.Close();
}
else
{
if (!IsValidEmail(txtEmail.Text))
{
MessageBox.Show("Invalid Email");
}
if (!isValidRegistrationNumber(txtRegistrationNumber.Text))
{
MessageBox.Show("Invalid Registration Number");
}
}
}
else
{
MessageBox.Show("Invalid Status");
if (!IsValidEmail(txtEmail.Text))
{
MessageBox.Show("Invalid Email");
}
if (!isValidRegistrationNumber(txtRegistrationNumber.Text))
{
MessageBox.Show("Invalid Registration Number");
}
}
}
else
{
MessageBox.Show("Invalid Contact");
if (!IsValidEmail(txtEmail.Text))
{
MessageBox.Show("Invalid Email");
}
if (!isValidRegistrationNumber(txtRegistrationNumber.Text))
{
MessageBox.Show("Invalid Registration Number");
}
if (!isDigit(cmbStatus.Text))
{
MessageBox.Show("Invalid Status");
}
}
}
else
{
MessageBox.Show("Invalid Last Name");
if (!isValidContact(txtContact.Text) && txtContact.Text.Length > 0)
{
MessageBox.Show("Invalid Contact");
}
if (!IsValidEmail(txtEmail.Text))
{
MessageBox.Show("Invalid Email");
}
if (!isValidRegistrationNumber(txtRegistrationNumber.Text))
{
MessageBox.Show("Invalid Registration Number");
}
if (!isDigit(cmbStatus.Text))
{
MessageBox.Show("Invalid Status");
}
}
}
else
{
MessageBox.Show("Invalid First Name");
if (!IsValidString(txtLastName.Text) && txtLastName.Text.Length > 0)
{
MessageBox.Show("Invalid Last Name");
}
if (!isValidContact(txtContact.Text) && txtContact.Text.Length > 0)
{
MessageBox.Show("Invalid Contact");
}
if (!IsValidEmail(txtEmail.Text))
{
MessageBox.Show("Invalid Email");
}
if (!isValidRegistrationNumber(txtRegistrationNumber.Text))
{
MessageBox.Show("Invalid Registration Number");
}
if (!isDigit(cmbStatus.Text))
{
MessageBox.Show("Invalid Status");
}
}
}
}
