正在学习C中，请问下面这段话，哪里有问题，怎么获取的res值，不论是否有重复值，都是-1

string sql = "select count(Fbarcode) as fcount from  T_XBXX where Fbarcode='" + txtbac.Text + "'";            
int res = SQLSERVERUtil.ExecuteSQL(sql);

谢谢

使用string sql = "select * from  T_XBXX where Fbarcode='" + txtbac.Text + "'";

不论是不是有数值，res也是-1

review the source code of the method "Class.ExecuteSQL(string)"(.net)

good luck!

谢谢回复，正在学习中，麻烦了，谢谢
class SQLSERVERUtil
{
省略
}
//能按条件，删除成功
string sql = "delete from  T_XBXX where Fbarcode='" + txtbac.Text + "'";            
int res = SQLSERVERUtil.ExecuteSQL(sql);

但是使用这句语句，res值都是-1
string sql = "select * from  T_XBXX where Fbarcode='" + txtbac.Text + "'";
int res = SQLSERVERUtil.ExecuteSQL(sql);