private void can_Submit_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { connect = new CTUConnection(); viewEm = new ViewEmployee(); if (string.IsNullOrEmpty(txt_FirstName.Text)) { MessageBox.Show("Please enter the firstname of the employee"); } else if (string.IsNullOrEmpty(txt_Surname.Text)) { MessageBox.Show("Please enter the surname of the employee"); } else if (string.IsNullOrEmpty(txt_IDnumber.Text) || txt_IDnumber.MaxLength != 13) { MessageBox.Show("Please enter the ID number of the employee"); } else if (string.IsNullOrEmpty(txt_UserName.Text)) { MessageBox.Show("Please enter the username of the employee"); } else if (string.IsNullOrEmpty(txt_Password.Text)) { MessageBox.Show("Please enter the password of the employee"); } else { connect.GetEmployee(txt_UserName.Text, txt_Password.Text, txt_FirstName.Text, txt_Surname.Text, txt_IDnumber.Text, Department, int.Parse(cmbx_Role.SelectedValue.ToString())); connect.SelectEmployee(); viewEm.DGV_Employee.ItemsSource = connect.table.DefaultView; } }