private void deleteButton_Click(object sender, EventArgs e)
        {
            if (dataGridView1.SelectedRows[0].Index < 0 || dataGridView1.SelectedRows[0].Index >= dataGridView1.Rows.Count)
            {
                return;
            }
            A_1_AddEmployee f = new A_1_AddEmployee((dataGridView1.SelectedRows[0].DataBoundItem as DataRowView).Row, this);

            a.runQuery("UPDATE Employees SET End_Date = '" + DateTime.Today.ToString("yyyy-MM-dd").Substring(0, 10).Replace('/', '-') + "' WHERE Employee_ID = " + int.Parse(dataGridView1.SelectedRows[0].Cells["Employee_ID"].Value.ToString()) + "");
            loadDatabase();
        }
        private void editButton_Click(object sender, EventArgs e)
        {
            if (dataGridView1.SelectedRows.Count <= 0)
            {
                return;
            }
            if (dataGridView1.SelectedRows[0].Index < 0 || dataGridView1.SelectedRows[0].Index >= dataGridView1.Rows.Count)
            {
                return;
            }
            DataRow         input_row = (dataGridView1.SelectedRows[0].DataBoundItem as DataRowView).Row;
            A_1_AddEmployee f         = new A_1_AddEmployee(input_row, this);

            f.ShowDialog();
        }
        private void AddButton_Click(object sender, EventArgs e)
        {
            A_1_AddEmployee f = new A_1_AddEmployee(this);

            f.ShowDialog();
        }