private void SinhMa()
{
dtKH = new DataTable();
DataSet ds = blKH.LayDSKHSinhMa();
dtKH = ds.Tables[0];
if (dtKH.Rows.Count == 0)
{
MaKH_TextBox.Text = "K01";
}
else
{
string a = this.dgvKH.Rows[this.dgvKH.Rows.Count - 2].Cells[0].Value.ToString();
int b = Convert.ToInt32(a.Substring(1)) + 1;
if (b < 10)
{
MaKH_TextBox.Text = "K0" + b.ToString();
}
else
{
MaKH_TextBox.Text = "K" + b.ToString();
}
}
}