//Add button private void btnSave_Click(object sender, EventArgs e) { //........................Validation.......................... if (cmdLecturer1.Text == "") { MessageBox.Show("Please Select Lecturer!"); } else if (cmdGroup.Text == "") { MessageBox.Show("Please Select Group!"); } else if (cmdSubject.Text == "") { MessageBox.Show("Please Select Subject!"); } else if (cmdTag.Text == "") { MessageBox.Show("Please Select Sub Tag!"); } else if (cmdSubGroup.Text == "") { MessageBox.Show("Please Select Sub Group!"); } else if (txtNoOfStudent.Text == "") { MessageBox.Show("Please Insert Number of Student!"); } else if (cmdDuration.Text == "") { MessageBox.Show("Please Select Time Duration!"); } else if (System.Text.RegularExpressions.Regex.IsMatch(txtNoOfStudent.Text, "[^0-9]")) { MessageBox.Show("Please Enter Number Only For No Of Students!"); } else { //get the value from the inpute fileds s.LecturerName1 = cmdLecturer1.Text; s.LecturerName2 = cmdLecturer2.Text; s.StudentGroup = cmdGroup.Text; s.Subject = cmdSubject.Text; s.Tag = cmdTag.Text; s.StudentSubGroup = cmdSubGroup.Text; s.NoOfStudent = int.Parse(txtNoOfStudent.Text); s.Duration = cmdDuration.Text; //Insert data into data using the method we created bool success = s.Insert(s); if (success == true) { MessageBox.Show("New Session Successfully Inserted!"); Clear(); } else { MessageBox.Show("Failed to Add new Session...Try Again!"); } } }