'Incorrect syntax near 'a+'.' hatası

private void KanStok()
{
    baglanti.Open();
    string query = "select *from KanTbl";
    SqlDataAdapter sda = new SqlDataAdapter(query, baglanti);
    SqlCommandBuilder builder = new SqlCommandBuilder(sda);
    var ds = new DataSet();
    sda.Fill(ds);
    KStoguDGV.DataSource = ds.Tables[0];
    baglanti.Close();
}