在c#中怎么判断特征值是否大于0

在c#中怎么判断特征值是否大于0

string strSql = "select panduan from stu";
string strConn = "Data Source=";

SqlConnection dbConn = new SqlConnection(strConn);

dbConn.Open();
//create command object
SqlCommand dbCmd = new SqlCommand(strSql, dbConn);
//use dbComm to create dbReader;
SqlDataReader dbReader = dbCmd.ExecuteReader();
int panduan;
while (dbReader.Read())
{
panduan=dbReader.GetInt32(0)
}
if(panduan==1)
{
button1.enabled=true;
}
else
{
button1.enabled=false;

}
if (null != dbReader)
{
dbReader.Close();
}
if (null != dbCmd)
{
dbCmd.Clone();
}
if (null != dbConn)
{
dbConn.Close();
}