private void SinhMa()
{
dtNV = new DataTable();
DataSet ds = blNV.LayDSNVSinhMa();
dtNV = ds.Tables[0];
if (dtNV.Rows.Count == 0)
{
MaNV_TextBox.Text = "N01";
}
else
{
string a = this.dgvNV.Rows[this.dgvNV.Rows.Count - 2].Cells[0].Value.ToString();
int b = Convert.ToInt32(a.Substring(1)) + 1;
if (b < 10)
{
MaNV_TextBox.Text = "N0" + b.ToString();
}
else
{
MaNV_TextBox.Text = "N" + b.ToString();
}
}
}