private void ButtonEmployeesDetails_Click(object sender, EventArgs e)
        {
            if (this.ListViewEmployees.SelectedItems.Count > 0)
            {
                this.Hide();
                FormEmployeeDetails _Form = new FormEmployeeDetails(this.ListViewEmployees.SelectedItems[0].Text);
                _Form.ShowDialog();
                this.Close();
            }
            else
            {
                MessageBox.Show("Please select Employee!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }