//Delete button private void btnDelete_Click(object sender, EventArgs e) { if (cmdLecturer1MS.Text == "" && cmdLecturer2MS.Text == "" && cmdGroupMS.Text == "" && cmdSubjectMS.Text == "" && cmdTagMS.Text == "" && cmdSubGroupMS.Text == "" && textNoOfStudentMS.Text == "" && cmdDurationMS.Text == "") { MessageBox.Show("Please Select Relavent Row!", "", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else if (cmdLecturer1MS.Text == "") { MessageBox.Show("Please Select Lecturer!", "", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else if (cmdGroupMS.Text == "") { MessageBox.Show("Please Select Group!", "", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else if (cmdSubjectMS.Text == "") { MessageBox.Show("Please Select Subject!", "", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else if (cmdTagMS.Text == "") { MessageBox.Show("Please Select Tag!", "", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else if (cmdSubGroupMS.Text == "") { MessageBox.Show("Please Select Sub Group!", "", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else if (textNoOfStudentMS.Text == "") { MessageBox.Show("Please Insert Number of Student!", "", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else if (cmdDurationMS.Text == "") { MessageBox.Show("Please Select Time Duration!", "", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else if (System.Text.RegularExpressions.Regex.IsMatch(textNoOfStudentMS.Text, "[^0-9]")) { MessageBox.Show("Please Enter Number Only For No Of Students!", "", MessageBoxButtons.OK, MessageBoxIcon.Warning); } else { //Delete data into data s.SessionID = Convert.ToInt32(id); bool success = s.Delete(s, id); if (success == true) { MessageBox.Show("Session Successfully Deleted!"); DataTable dt = s.Select(); SessionGridView.DataSource = dt; Clear(); } else { MessageBox.Show("Failed to Delete Session. Try Again!"); } } }