private void frmAdmin_Clear()
{
txtFullname.Text = null;
txtUsername.Text = null;
txtPassword.Text = null;
txtConfirmPassword.Text = null;
txtUsername.Enabled = true;
btnThem.Enabled = false;
btnSua.Enabled = false;
btnXoa.Enabled = false;
btnExit.Enabled = true;
dgvUsers.Enabled = true;
dtUsers = new DataTable();
dtPermissions = new DataTable();
bllUsers = new UsersBLL();
bllPermission = new PermissionBLL();
dtUsers = bllUsers.selectUserDetails();
dtPermissions = bllPermission.getPermission();
dgvUsers.AutoGenerateColumns = false;
dgvUsers.DataSource = dtUsers;
cboPermission.DataSource = dtPermissions;
cboPermission.DisplayMember = "Permission";
cboPermission.ValueMember = "IdPermission";
}
